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Chronos User Discussion / OLPF filter for Chronos cameras to reduce Aliasing/Moire?

« on: November 19, 2023, 09:50:36 AM »

I've been doing tests the last few years using external Caprock anti-moire filters to help reduce aliasing/moire in the Chronos 1.4. The problem is that which strength filter to use varies greatly on focal length and aperture which isn't suitable for zoom lenses as you need to change the filter strength each time. Most of the time for run and gun, I just base it off focal length and it does fine. The shot below was using a Navitar 75 1.3 at an fstop of 2.8. It's hard to test side by side as I don't have a separate Chronos camera, but it does help a lot in reducing aliasing/moire/false color in certain shots (mostly contrasty overly bright scenes, or things with very fine detail ie, trees, grass, feathers). However, while it does reduce these artifacts, it also blurs the image a bit which is why I use some upscaling/post sharpening in post. If I were to just upscale and post sharpen without using the filters, it will just oversharpen the moire/aliasing as well. The problem with using external OLPF filters in front of the lenses instead of the sensor is that you need to change it every time you switch focal lengths or lenses. If you use too strong a filter on a telephoto focal length, it blurs it too much and if you use too weak a filter on the wider focal lengths, it won't have any effect on moire/aliasing reduction.

Judging off the sample shots on the new Chronos 4K12, it looks like the new sensor design doesn't have these aliasing/moire artifacts as much, but it might be too early to tell. My question to Krontech is if they're eventually going to make a custom OLPF for the older cameras and the new ones? Some of the Chronos videos I’ve seen from users look way oversharpened laced with artifacts. I believe adding an OLPF will increase IQ for 1.4 and 2.1 owners and allow them to be more flexible with post sharpening giving more natural results.

Click on thumbnail below to see the video.

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Chronos User Discussion / Chronos 1.4 and 2.1 lowering bit depth to increase frame rates?

« on: November 16, 2023, 02:34:14 PM »

I see the new Chronos cameras have the ability to go down in bit depth to 8 and 10 bit to increase frame rate. Can a firmware upgrade be done to the 1.4 and 2.1 to allow for this ability as well?

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Chronos User Discussion / Chronos 1.4 and 2.1 Anamorphic Footage

« on: August 25, 2023, 06:04:38 AM »

Thought I'd make a new specific thread for anamorphic shots with the 1.4 and 2.1. I used my Sirui 75 1.33X and Blazar Nero 1.5X adapter on the 1.4 to take advantage of the full 1280 x 1024 sensor. You get an almost 2X squeeze with this combo and nice elongated painterly bokeh that is more oval-like. It def. creates a unique look to the 1.4. Just cropping into the Chronos 1.4 at 720P and adding black bars doesn't create the same look as a real anamorphic and you lose resolution and information at the top and bottom of image.