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Topics - B.H.V

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Chronos User Discussion / Chronos Q12 gone from website
« on: May 26, 2024, 02:15:33 PM »
Am I seeing things, or did they remove the Chronos Q12 from the website?

Chronos User Discussion / Chronos 4K12 and Q12 Footage Thread
« on: April 01, 2024, 08:33:20 AM »
I wanted to make a thread for people who want to share Chronos 4K12 and Chronos Q12 footage once they have their cameras on hand .  :)

Chronos User Discussion / Chronos 1.4 IR Filter Dimension Size Confusion?
« on: December 27, 2023, 07:17:07 AM »
Hi all, I'm seeing different dimensions for the IR filter size (See below links). Some documentation shows it as 15mm X 15mm, another shows it at 18mm X 18mm and 24mm X 16mm. What would the filter size be for a Chronos 1.4 received in 2018?

Just an idea. Some of us like the smaller 2/3 sensor form factor as we can use modern sharp 0.95 and 1.2 lenses (Laowa Argus, Meike and Nokton) at their wider aperture receiving more light into the sensor while keeping a greater depth of field for easier focusing compared to larger sensors. And I'm guessing by using a smaller sensor and some other cost cutting measures (ie. cutting the maximum record time to 3 seconds which would require less RAM), the camera can be more affordable. Looks like GPixel has a 2/3 2K sensor (see below). Just a thought. Was thinking this can maybe be around $5000-6500 as the lowest affordable option for Krontech. At this price point, I think more people would buy.
Some key specs:

"GSPRINT4502 is a 2.5 Megapixel (2048 x 1216), 2/3 (φ10.7 mm), high speed image sensor designed with the latest 4.5 m charge domain global shutter pixel. It achieves more than 30 ke- charge capacity and less than 4 e- rms read noise, with dynamic range of 68 dB which can be expanded using a multi-slope HDR feature. Utilizing an advanced 65 nm CIS process with light pipe and micro lens technology, the sensor achieves >65% quantum efficiency and < -92 dB parasitic light sensitivity.

GSPRINT4502 can achieve extremely high frame rates up to 3460 fps in 8-bit mode, 1780 fps in 10-bit mode or 850 fps in 12-bit mode, all at full resolution. With 22 on-chip charge binning, full well capacity can be further increased to 120 ke- and frame rate to 10,200 fps. GSPRINT4502 supports vertical and horizontal regions of interest for higher frame rates. GSPRINT4502 is perfect for high-speed applications including 3D laser profiling, industrial inspection, high speed video and motion analysis."

I see the new 4K12 and Q12 have the option for a Sony E mount adapter plate. Can the 1.4 and 2.1 get that same option as well?

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 Ive 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.

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?

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.

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