Tag Archives: F3

Updated notes for FS100 – F3 Video Review.

To see the video scroll down to the next blog entry.

The main aim of the shoot was to see how the FS100 held up against the F3. We shot on a bright sunny day by the River Thames and again in the evening in a typically lit living room. There were no big surprises. The FS100 is remarkably close to the F3. You would have no problems cutting between the two of them in a project.
I did find that the FS100 LCD appeared less sharp and not quite as good as the F3’s even though they both use the same underlying panel. This is probably down to the additional layers required for touch screen operation on the FS100. I also did not like the 18-200mm f5.6 kit lens. There was too much lag in the focus and iris controls, but the beauty of this camera is that you can use a multitude of lenses. For the evening shoot I used a Nikon 50mm f1.8 which was so much nicer to use. On reviewing the footage I did find that we were tending to over expose the FS100 by half a stop to a stop, this does make making accurate comparisons difficult and I apologise for this. I believe this was down to the slightly different images we were seeing on the LCD’s. I did use the histograms on both cameras to try to ensure even exposure, but even so there is a difference. A small part of this is also likely down to the very slightly different contrast ranges of the two cameras.
Oe thing we discovered, not mentioned in the video is that when you use a full frame lens, like the Nikon 50mm. You must ensure that the E-Mount adapter you use has an internal baffle or choke. If it doesn’t you will suffer from excessive flare. The adapter I had did not have a baffle and some shots (not used) were spoilt by flare. The adapter I have from MTF for the F3 has a baffle as do MTF’s E-Mount adapters, so these should not suffer from this issue.
The FS100 performance is so very close to that of the F3’s (at 8 bit 4:2:0, 35Mb/s) that it is hard to tell the two apart. I believe the F3’s images are just a tiny bit richer, with about half a stop more dynamic range, in most cases it takes a direct side by side comparison to show up the differences.
The range of camera settings and adjustments on the FS100 is not quite as extensive as on the F3, nor do the adjustments have such a broad range. However there is plenty of flexibility for most productions.
If you don’t need 10 bit 4:2:2 then it is hard to justify the additional cost of the F3, both cameras really are very good. Despite some other reports else where I felt the build quality to be very good and the buttons, while small, are big enough and well placed. If you do want autofocus then you will be pleased to know that it actually works pretty well on the FS100 with only minimal hunting (of course you must use an AF compatible lens).
I did also record the HDMI output to one of my NanoFlashes at 100Mb/s. Comparing these side by side it is extremely hard to see any difference. It is only when you start to heavily grade the material that the advantage of the higher bit rate Nanoflash material becomes apparent. There is less mosquito noise in the NanoFlash material. I was really impressed by the AVCHD material. The lack of noise in the images really helps.
The FS100 really is the F3’s little brother. The pictures are remarkably close, which they should be as they share the same sensor. The FS100 packs down into a remarkably small size for transport. The loan camera from Sony was actually packed in a case designed for the MC1P mini-cam, about 15″x10″x5″ so very compact indeed. The F3 is considerably larger and bulkier, in part due to the extra space taken up by the built in ND filters.
The lack of ND filters does need to be considered. There are some clever solutions in the pipelines from various manufacturers as well as existing solutions such as vari ND’s, screw on ND’s and a Matte Box with ND’s, so it’s not a deal breaker
I think there is every chance that the FS100 will be the first NXCAM camera that I will purchase. It will be a good companion to my F3. It’s modular design will allow me to get shots that are not possible with the F3. I felt that the FS100 (with the 18-200mm lens that I don’t like) was better suited to “run and gun” than my F3 with either manual DSLR lenses or PL glass. You can, with the FS100 simply point the camera at your subject and hit the one push auto focus and auto iris and have an in-focus, correctly exposed shot. This is much more like a traditional small sensor camcorder in this respect. The long zoom range also makes this more like a conventional camcorder, although there is no servo for the zoom.

In conclusion, in my opinion, for “run and gun” or quick and dirty setups the FS100 with the 18-200mm lens has an edge over the F3 due to the fast auto focus and auto iris one-push controls. For more precise work and shallow DoF your going to want a different lens, something with manual control and calibrated focus and iris scales. For more demanding shoots then the F3 is probably the better choice with it’s slightly improved dynamic range and the ability to use S-Log and 4:4:4. In either case these cameras can produce highly cinematic pictures and I see no reason why you could not shoot a great looking feature with either.

Two PMW-F3’s used on 3D Cinema Commercial.

Alister Managing the F3's on a Hurricane Rig.

I got back late last night from a big budget cinema commercial shoot where I was working with a pair of F3’s on a Hurricane Rig. All went very well and the DoP, (Denzil Armour-Brown)  was impressed by the F3’s. The overall light weight of the complete system really helped us when moving from position to position. We used a ton of Chapman grip equipment including sliders and dolly’s. I was responsible for the 3D rig, camera setup and alignment as well as assisting the DoP.
We shot using 2 sets of band new Zeiss Ultra’s, mainly at 32mm and 50mm (very nice) as well as some older and very heavy Arri 100mm macro primes. Our only small issue was that the follow focus motors were shifting the camera very slightly due to flex in the tripod base plate on the F3. You probably wouldn’t notice this at most normal focal lengths in 2D but in 3D small shifts are very obvious. So a stiffener plate for the base will be needed to prevent this (as well as general flex) or a pair of 15mm rails mounted to the top holes on the F3 body.

We were recording to a Nano3D (2 x Nano Flashes) as well as to a Mac workstation recording ProRes in the video village. The video village allowed for instant playback on 50″ 3D monitors in a blacked out tent for review and tech assessment.

It was an outdoor shoot in great weather. As well as the F3’s there was a second rig with a pair of Phanton HD Gold 35mm high speed cameras shooting 3D at 1000fps. So even thought the sun was shining brightly, many shots were done with 2 or 3 18kw lamps!!

Towards the end of day the F3 rig was tasked with shooting some blue screen and other effects shots and in effect I became 2nd unit DoP. The effects shots will be matted in to the finished commercial.
I’m under NDA so can’t talk about the subject just yet, or post any pictures that show the subject, but once the ad is released (2 weeks time!!) I’ll be able to post some grabs and more photos.

Two PMW-F3’s used on 3D Cinema Commercial.

Alister Managing the F3's on a Hurricane Rig.

I got back late last night from a big budget cinema commercial shoot where I was working with a pair of F3’s on a Hurricane Rig. All went very well and the DoP, (Denzil Armour-Brown)  was impressed by the F3’s. The overall light weight of the complete system really helped us when moving from position to position. We used a ton of Chapman grip equipment including sliders and dolly’s. I was responsible for the 3D rig, camera setup and alignment as well as assisting the DoP.
We shot using 2 sets of band new Zeiss Ultra’s, mainly at 32mm and 50mm (very nice) as well as some older and very heavy Arri 100mm macro primes. Our only small issue was that the follow focus motors were shifting the camera very slightly due to flex in the tripod base plate on the F3. You probably wouldn’t notice this at most normal focal lengths in 2D but in 3D small shifts are very obvious. So a stiffener plate for the base will be needed to prevent this (as well as general flex) or a pair of 15mm rails mounted to the top holes on the F3 body.

We were recording to a Nano3D (2 x Nano Flashes) as well as to a Mac workstation recording ProRes in the video village. The video village allowed for instant playback on 50″ 3D monitors in a blacked out tent for review and tech assessment.

It was an outdoor shoot in great weather. As well as the F3’s there was a second rig with a pair of Phanton HD Gold 35mm high speed cameras shooting 3D at 1000fps. So even thought the sun was shining brightly, many shots were done with 2 or 3 18kw lamps!!

Towards the end of day the F3 rig was tasked with shooting some blue screen and other effects shots and in effect I became 2nd unit DoP. The effects shots will be matted in to the finished commercial.
I’m under NDA so can’t talk about the subject just yet, or post any pictures that show the subject, but once the ad is released (2 weeks time!!) I’ll be able to post some grabs and more photos.

Ultimate Documentary Production workshop. (3D as well if enough interest)

Alister Shooting a Supercell Thunderstorm

I’m planning on running a Documentary production workshop and 3D workshop based on a Storm Chasing trip to the USA from the 4th to the 12th of June. The trip would be an excellent chance to really put your documentary skills in to practice and learn more about your cameras and workflow shooting a short film about the violent weather that hits Tornado Alley every spring. We can even shoot in 3D if that’s what people are interested in. I can provide a PMW-F3, lens kit and EX1R, but hopefully you would bring your own cameras and I can teach you how to get the most out of them. depending on the weather each day there would be a classroom session or practical on location session covering everything from sound and interview techniques, to camera setup and shooting tips. Will will do a lot of timelapse, make use of cache record (if you have it) and work in some very challenging lighting situations. Each member of the group will be given different roles to play as part of the “crew” each day so that they may gain a better understanding of the difficulties of each role. At the same time the idea is that each person will also create their own personal short film about our storm chasing adventure. With luck we should see incredible thunderstorms, giant hail and maybe even a tornado or two (I’ve been storm chasing for 12 years, it’s my speciality). The cost for this comprehensive and very exciting workshop will be $1800 USD per person for a place on the course. In addition to that each student will be responsible for their overnight accommodation. Typically we will stay in hotels/motels that cost approx $100 USD per night, so you should budget for approx $800 for accommodation bringing the total to $2600. We will depart from Denver, Colorado so you will have make your own travel arrangements to/from Denver. This will be a real educational adventure. The previous trips I have run to Norway for the Northern lights, Arizona for lightning and Tornado Chasing have been great successes with many people returning for more. We will spend a lot of time on the road, visiting many parts of the Mid-West. It will be fun and you should come away with improved video skills, a great short film, and amazing stories of adventure and excitement. Please use the contact form if your interested. Places are limited.

Lens Tests at F3 Dubai Workshop.

Off to the airport to fly home in a minute, but I thought I would jot down some notes about the various lenses we were able to look at during the F3 workshop I ran here in Dubai. We had a set of the Sony PL primes, a Zeiss CP2, some Zeiss ZF.2 stills lenses, a Nikon 50mm and a Tokina 28-70mm ATX pro zoom. The stills lenses were all attached to the F3 using an MTF to Nikon adapter.

It was hard to see any difference between the Sony primes and the CP2, this was kind of expected. When comapring the PL’s to the Tokina zoom, the zoom was a little soft wide open at f2.6. Stopped down half a stop and it looked much better, but it needed to go down to f4 before it came close to matching the PL’s. Even then the PL’s had the edge, but then this is comparing a zoom to a prime. I would certainly have no hesitation over using the Tokina at f4 or more closed. The Nikon 50mm pancake, f1.8 was surprisingly good. Even wide open it produced a respectable image, stopped down to f2.8 it was a very close match to the PL’s. The Zeiss ZF.2’s were the budget stars of the show as even wide open these produced sharp, clean images with very similar bokeh and flare performance to the primes, very impressive performance.

Of course ergonomically the PL’s were better. Bigger focus rings, bigger iris rings and better focus scales. The CP2 impressed with it’s near 360 degrees rotation of the focus ring with very clear and accurate witness marks and wide distance spacing even approaching infinity. If I could afford a set of CP2’s that’s what I would buy, but I can’t. The Sony PL’s are good lenses, they don’t quite have the build quality of the CP2’s but they do represent excellent value for the money. If your budget won’t stretch to PL glass then the Zeiss ZF.2’s are about as close as you’ll get to a PL lens, but do watch out for the amount of telescoping when you focus the longer focal length ones. That can make using a matte box very tricky. I know my Nikon 50mm and Tokina 28mm primes work well. The Tokina 28-70 while not as sharp as the primes will still make a good all-round lens. All I need now is to get a nice 85mm and 135mm and I’ll be happy. Maybe a couple of ZF’s.

Sony FS-100 Super 35mm NXCAM Camcorder Announced.

Sony FS100 fitted with PL mount lens.

Well the rumours have been circulating for some time and prototypes have been seen at various trade shows, but the full details have been sparse to say the least. Well here it is, it’s called the FS-100 and it’s a quite radical design from the Sony Shinegawa factory. The Super 35mm NXCAM shares the same sensor as the new PMW-F3, so the images will be excellent, but the design of the camera body itself could not be more different. If you don’t like it…  well you can blame me and several other DoP’s that were invited to attend brainstorming sessions with the Sony engineers. In the photo below you can see the white board from one of those sessions and you can see where we (me and the other DoP’s) discussed ideas like a modular design with removable handles and how we hold handycam cameras.

The end result is this rather quirky but in my opinion, really quite clever and versatile design. The top viewfinder allows you to use the camera cradled in your hands in front of you, either using just the LCD panel or the monocular viewfinder. When your doing interviews you can twist it so that it is visible from either side of the camera, excellent for those interviews where you are both camera operator and interviewer. It allows you to alternate the sight lines from left to right of the camera for more varied interviews. It’s also useful for shooting in cramped locations such as in the front of a car as you can hold the camera sideways in front of you to shoot… I mean film…. the driver and still see what your getting.

Top view of FS100 body

Unlike most traditional camcorders the camera can be stripped down to just the sensor/recorder body. You can remove the top handle, mic holder and hand grip. In addition it has a multitude of tripod mounting holes on the top, bottom and even one side. On the base of the camera there are 6x 1/4″ threaded holes and wait for it… 2x 3/8″ holes. Hooray!! On the top there are a further 3x 1/4″ holes and there is even one on the side, revealed when you detach the removable hand grip. This is going to be fantastic for use on cars as a 35mm minicam or crash-cam. It will make getting all those different car chase angles so easy as a few small suction mounts will allow you to mount the stripped down camera just about anywhere. I can see the FS-100 becoming a “must-have” B camera to compliment my F3. The 1/4″ thread on the side of the camera means you can mount it on it’s side for portrait style shooting for digital signage or to get the maximum resolution when shooting people for chroma key.

While the camera does come with a detachable handgrip, there is no zoom rocker like the F3. That’s because the camera is primarily aimed at those using DSLR lenses which don’t have servo zooms, although PL mount adapters are available. The front end of the camera has Sony’s E mount for interchangeable lenses. It will come with the rather nice (if a little slow) 18-200mm f3.5-f6.3 optically stabilised zoom lens and the auto focus and auto iris do work! As well as Sony’s own G series lenses for the NEX cameras you can get adapters for Sony A mount and most other lenses. Do consider that if you are planning on using heavy PL lenses that the E mount is not designed for such high loads, so an additional lens support system should be used.

Rear view Fs100

On the input and output front the FS-100 has most of the connectors you would expect to find on an NXCAM camcorder, with one notable exception… HDSDi. There is no HDSDi, but don’t panic! The camera does have HDMI and the quality available from HDMI is every bit as good as HDSDi. No word as to whether it’s 8 bit or 10 bit though. Sony are well aware that the one thing missing from HDMI is normally timecode, but even that has been addressed and it will be possible to export timecode in the HDMI stream, although at the moment we need to wait for the HDMI recorders to update them to accept timecode via HDMI. There are 2 XLR connectors for audio in. One on the right side and one on the rear, there is also the usual mini-D component out and RCA/Phono audio and composite video outputs.

Sony FS100 35mm NXCAM

When you start to delve into the cameras frame rates and recording modes things get really interesting as the FS100 will record full 1920×1080 at 60P and 50P. Even the F3 can’t do this internally (you can output 50/60P to an external recorder). As well as all the usual frame rates like 23.98, 60/50i, 30/25P you can also shoot full resolution slo-mo at up to 60fps using S&Q motion. It’s not quite as flexible as the F3 as you will find that you only have a choice of frame rates (for example 1,2,3,6,12,25,50fps) and won’t have the ability to dial in any frame rate you want, but all frame rates will be full 1920×1080. As with the other NXCAM camcorders all these lovely modes will be recorded on to SD cards or Memory Sticks using the AVC HD codec (mpeg 4), in addition you can add the Sony FMU128 (128Gb Flash Memory Unit) for dual recording giving peace of mind with one off events.

Once your footage is on your cards the cleverness of this camera continues as you don’t need a laptop to backup your data. Simply plug in a USB drive or even a Blu-ray burner), direct to the cameras USB port and you can backup direct from the camera to the drive. Your footage will contain GPS data about when and where you shot it, which for me will be a great bonus with my severe weather footage as I can never remember exactly where I was during a storm chase!

All in all this is looking like one hell of a camcorder. The street price is estimated to be below $6000 USD, so you do have to ask the question.. why buy an F3 when this is half the price? In my view they are two quite different cameras for different applications. The F3 has the ability to output full 10 bit 4:4:4 for extremely high quality recording possibilities. It also has built in ND filters and will have S-Log and 3D dual camera control. For multi-camera shoots the F3 has Genlock and timecode in/out. There will also be some nice servo zooms for the F3 some time later this year or early next year. The F3 is a camera that would not at all be out of place as a B camera on a big budget production. The FS-100 will I’m sure also find a place on big budget productions, perhaps as a crash-cam or mini cam. But overall I think it will be most at home on more run and gun style shoots where auto iris and maybe even autofocus are beneficial. I really do think that the FS100 will replace many of the DSLR’s out there currently being used for video as a lot of thought has gone in to the ergonomics.

These are very interesting times. It’s now possible to shoot a movie, with quality good enough for mainstream theatrical release on cameras costing little more than a high end home video camcorder of just a few years ago. I doubt most cinema goers would realise that a camera like the F3 or FS100 was used, especially if it’s recorded to a NanoFlash, KiPro or even the new Convergent Design Gemini. However we must not forget that content is king, not the technology that makes it possible.

PMW-F3 and Stills Glass, some observations.

I have been using my F3 with a range of stills lenses via the MTF F3 to Nikon adapter. Overall everything works very well and I am pleased with the quality of the images I have been getting. However the use of stills glass is not as easy as using dedicated PL lenses. The main issue for me is iris control. With a PL mount lens you have a nice big iris ring so you know exactly where your exposure is. With some of my stills lenses I do have a traditional iris ring and with these lenses all is good. But as so many DSLR’s these days have electronic iris control many of the lenses I have don’t have an iris control ring. Mike Tapa’s adapter can control the iris of a Nikon DSLR lens by moving the blade that controls the shutter on the rear of the lens, but there are no markings or any way way of knowing what the iris is set to. This makes judging when to use more ND or where you are regarding DoF impossible to judge other than via a monitor. You can’t tell whether you are operating the lens at it’s optimum settings. In addition many of the Nikon DX lenses don’t have calibrated focus scales, so again it all comes down to guess work and the monitor.

With well designed stills glass things work well. My older Tokina 28-70 AT-X pro works very well with an accurate focus scale and proper iris control. My Nikon 50mm f1.8 manual lens and Tokina 28mm f2.8 lens also work nicely, but the Nikon DX lenses I have are far from ideal. I’m considering getting a set of Zeiss ZF.2 stills lenses as these appear to be very good lenses. I really need a prime in the 85mm range for interviews and portrait type shots.

The focal lengths I use the most are: 28mm, 50mm and  70mm. I would use a bit longer if I had the right lens. I don’t use the 18mm very often except for panoramas and landscapes.

So…. PL would be nice, but at the moment my budget won’t stretch to that. The Sony kit lenses are certainly great value for the money, but really 35mm isn’t wide enough so I would have to add a wider lens anyway. Stills glass can produce great results, but is not quite so user friendly.

Measuring Resolution, Nyquist and Aliasing.

When measuring the resolution of a well designed video camera, you never want to see resolution that is significantly higher than HALF of the sensors resolution. Why is this? Why don’t I get 1920 x1080 resolution from an EX1, which we know has 1920 x1080 pixels, why is the measured resolution often around half to three quarters what you would expect?
There should be an optical low pass filter in front of the sensor in a well designed video camera that prevents frequencies above approx half of the sensors native resolution getting to the sensor. This filter will not have an instantaneous cut off, instead attenuating fine detail at ever increasing amounts centered somewhere around the Nyquist limit for the sensor. The Nyquist limit is normally half of the pixel count with a 3 chip camera or somewhat less than this for a bayer sensor. As a result measured resolution gradually tails off somewhere a little above Nyquist or half of the expected pixel resolution, but why is this?
It is theoretically possible for a sensor to resolve an image at it’s full pixel resolution. If you could line up the black and white lines on a test chart perfectly with the pixels on a 1920 x 1080 sensor then you could resolve 1920 x 1080 lines. But what happens when those lines no longer line up absolutely perfectly with the pixels? lets imagine that each line is offset by exactly half a pixel, what would you see? Well each pixel would see half of the black line and half white line. So each pixel would see 50% white, 50% black and the output from that pixel would be mid grey. With the adjacent pixels all seeing the same thing they would all output mid grey. So by panning the image by half a pixel, instead of now seeing 1920×1080 black and white lines all we see is a totally grey frame. As you continued to shift the chart relative to the pixels, say by panning across it, it would flicker between pin sharp lines and grey. If the camera was not perfectly aligned with the chart some of the image would appear grey or different shades of grey depending on the exact pixel to chart alignment while other parts may show distinct black and white lines. This is aliasing and it’s not nice to look at and can in effect reduce the resolution of the final image to zero. So to counter this you deliberately reduce the system resolution (lens + sensor) to around half the pixel count so that it is impossible for any one pixel to only see one object. By blurring the image across two pixels you ensure that aliasing wont occur. It should also be noted that the same thing can happen with a display or monitor, so trying to show a 1920×1080 image on a 1920×1080 monitor can have the same effect.
When I did my recent F3 resolution tests I used a term called the MTF or modulation transfer function, which is a measure of the contrast between adjacent pixels, so MTF 50 is where there is a 50% of maximum contrast difference between the black and white lines on the test chart.
When visually observing a resolution chart you can see where the lines on the chart can no longer be distinguished from one another, this is the resolution vanishing point and is typically somewhere around MTF15 to MTF5, ie. the contrast between the black and white lines becomes so low that you can no longer distinguish one from the other. But the problem with this is that as you are looking for the point where you can no longer see any difference, you are attempting to measure the invisible so it is prone to gross inaccuracies. In addition the contrast at MTF10 or the vanishing point between black and white will be very, very low, so in a real world image you would often struggle to ever see fine detail at MTF10 unless it was strong black and white edges.
So for resolution tests a more consistent result can be obtained by measuring the point at which the contrast between the black and white lines on the chart reduces to 50% of maximum, or MTF50 (as resolution decreases so too does contrast). So while MTF50 does not determine the ultimate resolution of the system, it gives a very reliable performance indicator that is repeatable and consistent from test to test. What it will tell you is how sharp one camera will appear to be compared to the next.
As the Nyquist frequency  is half the sampling frequency of the system, for a 1920 x 1080 sensor anything over 540 LP/ph will potentially aliase, so we don’t want lots of detail above this.  As Optical Low Pass filters cannot instantly cut off unwanted frequencies there will be a gradual resolution tail off that spans the Nyquist frequency and there is a fine balance between getting a sharp image and excessive aliasing. In addition as real world images are rarely black and white lines (square waves) and fixed high contrast patterns you can afford to push things a little above Nyquist to gain some extra sharpness. A well designed 1920 x 1080 HD video camera should resolve around 1000TVL. This where seeing the MTF curve helps, as it’s important to see how quickly the resolution is attenuated past MTF50.
With Bayer pattern sensors it’s even more problematic due to the reduced pixel count for the R and B samples compared to G.
The resolution of the EX1 and F3 is excellent for a 1080 camera, cameras that boast resolutions significantly higher than 1000TVL will have aliasing issues, indeed the EX1/EX3 can aliase in some situations as does the F3. These cameras are right at the limits of what will allow for a good, sharp image at 1920×1080.