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Silicon Imaging SI-2K
2/3" 1080p IT-integrated 10-bit digital cinema w/direct-to-disk recording.

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Old October 6th, 2019, 06:27 AM   #1
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Si2k without anti-aliasing filter.

This is a long shot given the time since the SI2K was subsumed by the 4K+ evolutions.

Has anyone operated the camera with the anti-aliasing filter removed in order to chase some more "apparent" resolution. If so, what did you do about the IR filter?

The SI2K has its combined IR/anti-aliasing filter mounted in a small circular metal holder. The SI2K with the stock filter was a little inclined towards IR contamination of the image with weak greens, more so with ND filters in the path.

If anyone went this route, any advice on a suitable IR filter glass, brand, model number would be appreciated.

Why am I asking? The Blackmagic "big" URSA 4K, which took over from my SI2K has laid down for the count and affordable product support is not there to be had. I am going back to the older SI2K camera as I can't afford anything else presently.

With a speedbooster for the Blackmagic Pocket cam in the optical path, the practical utility of the SI2K camera is extended, even if it is not 4K.

The image lacks that bit of crispness folk seem to expect these days.

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Old October 14th, 2019, 08:21 AM   #2
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Re: Si2k without anti-aliasing filter.

With just a plain IR filter in the throat of the camera, no anti-aliasing filter and the 35mm to 2/3" Speedbooster optic in play, the setback required to adjust for the thinner piece of filter glass is considerable.

If there is an apparent resolution improvement, it is very subtle. The anti-aliasing filter must have been well matched. Still it can be made to work and seems to hold good for the 14mm wide-angle Sigma-for-Nikon lens.

Daylight tests tomorrow. It is not 4K but it will do for now, seeing as how Blackmagic's URSA 4K has gasped its last.
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Old Yesterday, 05:13 AM   #3
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Re: Si2k without anti-aliasing filter.

For what it is worth, here is a link to a short clip with the following items in the image path :-

OPLF/IR FILTER REMOVED.
THIRD PARTY IR FILTER SUBSTITUTED.
METABONES SPEEDBOOSTER FOR BMPCC.
TIFFEN IRND1.8. TO BRING LIGHT LEVEL WITHIN SWEET SPOT OF LENS.
FLANGE OF NIKON F-MOUNT MOVED REARWARDS TO COMPENSATE FOR THINNER FILTER.

I may also try a contrast filter which I have tried in the path previously with the IR filter to build the filter thickness as infinity focus is a whisker out of reach without skimming a trace more material off the rear of the speedbooster body.

You can blame me for the blue hue. I am partially red-green colourblind. The SI2K look files are no longer supported by edit software. The raw image is very flat and takes a lot of dragging up and saturation range runs out. There is likely a way to do it but I am no colour-grader or editor. I was also unable to export the timeline at original resolution but the lower 1920x1080.


Last edited by Bob Hart; Yesterday at 05:16 AM. Reason: error
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