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@resonanceimaging-blog
HXX-IR Custom Covert 4K POV Camera
Ikonoskop Sensor Calibration
The Ikonoskop A-Cam is ready to shoot right out of the box and the new firmware, 1.28 has given us a new gamma curve that provides a more pleasing image before grading. I have noticed though that when shooting 12db gain at night there is uneven exposure in one of the quadrants of the sensor.
The A-Cam uses a CCD sensor made up of four quadrants that are "stitched" together to create a seamless frame. These quadrants come calibrated from the factory but with new firmware or shooting conditions may need to be readjusted. I had been happily shooting without noticing any problems until after a recent night shoot with the camera set to 12db gain, the highest setting, and 180 degree shutter.
When I reviewed the footage I could see the very faint outline of a square corner in the lower left quadrant which appeared darker in exposure. For a couple of minutes wracked my brain playing around with gamma and lift in Resolve thinking that I was trying to push this low light shot too much but then I hit me. I have never re calibrated the camera at the highest gain setting.
Yesterday I read the instructions in the manual... like most of the documentation from Ikonoskop its very sparse. I understood the basic principle though so I decided to go for it.
First step in the process is to turn the camera on and let it warm up for 20 minutes this ensures that you are calibrating correctly. While the camera is warming up prepare an evenly light white surface, I didn't have a white card at my friends house so I used a piece of white paper illuminated with a task light.
After the camera has warmed up simply point it at the white surface and adjust the distance or zoom until the entire frame is filled. Use the menu navigation button and toggle to Maintenance>Calibrate>Recalibrate. The menu will direct you to adjust the aperture of your lens until the value is between 1800 and 2200. A number appears in red in the top left corner and goes up in value the more you open the lens and decreases as you close it.
The numbers jump around quickly so you have to adjust slowly. After you are in range the number will turn white, you are then prompted to press any button to activate the calibration. After you press the button you can see the quadrants lighting up with green pulsing lines.
The process is quick and then you are prompted to adjust the number to a value between 400-500. To achieve this number value you must close the lens down and then once the number value is correct it will show in white and you press any button and the calibration process begins again.
After the process has been completed you will be notified by a screen saying that it was successful. The menu will default back to the mainten menu so you have to navigate back to Calibrate>Save as Default.
If you want to create alternate calibration settings you have to select Calibrate>Custom Calibration.
Its important to know that calibration settings affect only the specific gain that the camera is set at. If you are experiencing quadrant issues at 12db then you only have to calibrate at that gain level. If you are having problems on the other settings then you will have to go through the process at each level to ensure proper calibration.
The whole process took about ten minutes from start to finish and this is something that you can easily do on set if you have to. If you are filming outside though you must use your ND filters since without them in sunlight at least here in California you won't be able to close your lens down enough to reach the correct values.
In the Shadow of the Sun
Concrete Moon
Late night winter street Ikonoskop A-Cam 12db 360degree shutter T2.2
I tend to shoot these scenic moving portraits at the end of the day, the storm this week had given even the afternoons a gloomy darkness and at about 4pm the sky would turn from grey to purple. The Ikonoskop is not a see in the dark 20,000 ISO beast but you can coax amazing images with very little light. The camera seems to blow out the blue channel with these dark winter shots but its easy to create a look in SpeedGrade and apply it for specific daylight conditions which all this week were blowing grey snow or freezing cold night sky.
Filmed quite a bit this week in blizzard conditions with blowing snow and very cold temperatures.
First Weeks with Ikonoskop A-Cam
I purchased a used Ikonoskop a month ago for a documentary that I am leaving for at the end of January. The choice was definitely not based on what camera would be the most suited to the conditions I will experience but rather I looked at it from another perspective; how can I adapt a device that captures imagery the way that I want to, to a situation where it hasn't been used in yet.
This adaptive philosophy has been the foundation of my work so far where I build and utilize custom camera systems for surveillance, vehicle and POV shoots. The cameras I used in this line of work are completely different in aesthetics but I have always started by visualizing the end result and working backwards by forcing the gear to suit the vision.
When envisioning the end result of the project I knew that I wanted a modern version of a 16mm news camera. I wanted a density in the imagery that isn't available when shooting with a 35mm CMOS DSLR, a richness that could carry the weight of what I'll be filming. Combining these two identities has been a challenge but I think that I have created a rugged but simple setup suited for documentary film making in a variety of conditions.
The foundation of the kit is the Ikonoskop A-Cam with the Zeiss 11-110 zoom lens. This combination gives a decent amount of coverage in a lightweight package. I added an Asperon wide angle adapter that clips onto the front of the lens turning it into a 6.6mm fixed prime with no light loss. I will also be adding a Mutar 2x doubler for additional reach.
To keep the profile of the camera to a minimum I decided not to use a mattebox, it's too intimidating to stick a big black box in people's faces and expect them to act natural. I looked for a long time for a lightweight clip on system and found an amazing solution with the Schneider 87SSLR.
The Schneider adapter clips onto the outside barrel of the lens and allows you to use 4.5" drop in filters. The filters are then held in place by a retaining ring that screws in and allows for the use of a rotating filter adapter for polarizers and a collapsible rubber hood. Schneider doesn't keep the 87SSLR in stock but when I contacted them they machined one for me in about 2 days. I am really impressed by their service and response in fulfilling this request on a part that I'm sure is rarely ordered.
I'm using a Schneider One Stop Tru-Pola and Tiffen .6, 1.2 IRND, and 2.1 IRND. If I'm going from bright outdoors where I would have the 2.1IRND to a dark interior it takes a second to loosen the lockring on the 87SSLR and remove it.
The Ikonoskop is a long camera but can be used bare with a small prime quite easily, the viewfinder is actually very good and in this configuration the ideal way to shoot. The Zeiss 11-110 however creates a balance point slightly ahead of the lens mount requiring a setup that can be shoulder mounted for proper stability; this negates the ability to use the built in viewfinder though.
Achieving a stable shoulder setup without useless counterbalances requires mounting a monitor or viewfinder almost near the end of the lens, I looked at a couple of options; a small monitor is too large, the camera's video out is SDI so that limited the choice of viewfinders to either the Cineroid or the Alphatron. The Alphatron is very large and the Cineroid has waveform and the ability to use it as a micro monitor with the viewfinder loupe completely removed, which is how I like to shoot.
I have had some issues with the Cineroid though. Quality control doesn't seem to be very stringent and the first unit I bought had a faulty battery plate though Birns and Sawyer the US distributor quickly switched it out for me and I have had no problems since with powering the unit (which uses the same Sony batteries as the camera). One issue that I'm still unhappy with is the light leak around the top edge of the Retina screen. I used to have a Dell laptop that had this issue along the bottom edge and I hated it, its only visible on the Cineroid when the top portion of the screen is filled with pure black like night sky. The feature set and versatility don't make me regret the purchase.
The Cineroid is mounted on the end of forward facing Wooden Camera Cheese handle and NATO rail (inspired by Aaron Vogel's rig) using their EVF mount. I love all of their stuff, it's incredibly well made and functional. The NATO rails allow the handle and EVF to slide apart in seconds allowing the camera to be reconfigured or stowed away very quickly.
I wanted to use the Wooden Camera shoulder pad and probably would if I was going to use a V-Lock battery but the price and the size put it out of contention; I wanted everything to be able to pack flat or close to it. I looked at the contours of the camera and below the viewfinder the camera follows a curve that had a remarkable resemblance to the Movcam shoulder pad which is inexpensive and very lightweight. This mounts to rods underneath the camera via a Red Rock Micro Really Right Stuff baseplate (another credit to Aaron Vogel).
I am still waiting on a handle to complete the rig.
Next post will contain pictures of all the items mentioned.
Working with the Ikonoskop's 12bit RAW images in either Speedgrade or Resolve allows you to create a palette as immersive or subtle as you like.
Shooting with the Ikonoskop allows you to create visual stories with a textural complexity like nothing else.
Los Angeles a couple of hours after picking up my Ikonoskop A-Cam. Graded in Adobe Speedgrade.
Finally purchased an A-Cam DII and Zeiss 11-110 zoom will start posting some tests of my documentary rig and workflow next month once I have it out in the field.
I was writing a post which was questioning my decision to use the A-Cam for a documentary, which will be largely unsupported in some very rugged conditions, mainly due to the need for a timecode enabled field recorder like the Sound Devices 702T. Running around in West Africa with this setup would produce amazing quality audio but the cumbersome nature of this setup is daunting. I was thinking that the Canon C300 might be a better camera for this project since I could use weather sealed lenses and a data storage was no problem due to the light 50Mbps XF codec. I know I wouldn't appreciate the image of the C300 as much as the A-Cam but maybe the practical choice should win over pure IQ.
In steps Ikonoskop today with the release of the Acam dll Audio Tool today, its a light application that launches immediately and has a basic easy to understand GUI. Point it to your folder containing the C DNG sequence and click export, audio files can be exported as WAV, AIFF, or BWF. This simple program has eliminated the 702T from my gear list and my thought now is to just run a MixPreD mounted on the back of the A-Cam (which to be clear I don't own ...yet... very soon) Ikonoskop A-Cam dll ENG
Sorting out a system for recording audio with the Ikonoskop A-Cam has been a challenge, mainly due to the fact that I don't own the camera yet, but also because of the limitations of the camera. The Ikonoskop can record sound internally but because the sound is embedded partially within each DNG frame the only way to retrieve the audio is with CinemaDNG Importer from Ikonoskop. The separate sound file would then have to be recombined with your processed video files in your NLE timeline.
Using this workflow wouldn't be too bad except that there is no way to batch import files so each scene would have to be imported, converted, have the audio stripped away and then recombined in a timeline. I need to maximize efficiency so even though recording in camera would be ideal at this time it doesn't seem like the best idea.
Then I thought that the camera would output timecode since the specifications include the ability to select between rec/run and free run. My new plan was to use a Sound Devices 702T or a Zaxcom ZFR100 with stereo adapter both of which can be triggered by rec/run timecode. This would be ideal since I would have easy to match up audio clips. This however has is not the case and I just learned from Ikonoskop that the camera can not output timecode and can't trigger an external recorder.
I think that I'll probably just synch the A-Cam to the 702T and match clips via timecode, not the elegant solution that I was hoping for but simple enough.
Black Magic's implementation of audio in their DNG files is different in that a separate .wav file is created with each take. This is a much better idea especially if you need quick turnaround. Ikonoskop has promised further development of their DNG importer including batch imports which would make all of this a lot simpler.