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Chronos User Discussion / Re: Chronos 1.4 IR Filter Dimension Size Confusion?
« Last post by B.H.V on January 06, 2024, 09:39:19 AM »Thanks ROB!
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Chronos User Discussion / Re: Chronos 1.4 IR Filter Dimension Size Confusion?
« Last post by Rob_G on January 05, 2024, 12:06:26 PM »Hello B.H.V.
You are right there are three different size for the IR filters
1.4 Chronos Cameras produced up to 07/16/2020, S/N 01836 or lower, have an IR filter of size 15 mm by 15 mm.
You are right there are three different size for the IR filters
1.4 Chronos Cameras produced up to 07/16/2020, S/N 01836 or lower, have an IR filter of size 15 mm by 15 mm.
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Chronos User Discussion / Re: Exposure time setting.
« Last post by Rob_G on January 04, 2024, 11:48:55 AM »Hi Hsmore,
Seems like you are running an interesting experiment to capture the flight of a supersonic projectile.
You need to know the physical size that corresponds to each pixel, also referred to as the resolution, in your field of view.
As an example, if the physical width of your field of view, 320 pixels, is 5 m, then the resolution of your imaging system is
5m/320 pixels = 0.0156m/pixel or 15.6 mm/pixel.
Blurred motion is seen when the object captured travels more than 1 pixel during the time the camera ir recording.
Next, you can compare the time, t, it takes the object to travel a distance equal to the size of 1 pixel. t = 0.0156m / 731.5m/s = 21.3 µs.
You can set your exposure time to 21 µs.
If the exposure time is longer then you get blurred motion. If you set it lower than 21 µs you avoid blurred motion but you also require more light to illuminated the scene adequately.
Note that this number is based on the assumption that your filed of view is 5m. Estimate your exposure time based on the actual size of your field of view.
Seems like you are running an interesting experiment to capture the flight of a supersonic projectile.
You need to know the physical size that corresponds to each pixel, also referred to as the resolution, in your field of view.
As an example, if the physical width of your field of view, 320 pixels, is 5 m, then the resolution of your imaging system is
5m/320 pixels = 0.0156m/pixel or 15.6 mm/pixel.
Blurred motion is seen when the object captured travels more than 1 pixel during the time the camera ir recording.
Next, you can compare the time, t, it takes the object to travel a distance equal to the size of 1 pixel. t = 0.0156m / 731.5m/s = 21.3 µs.
You can set your exposure time to 21 µs.
If the exposure time is longer then you get blurred motion. If you set it lower than 21 µs you avoid blurred motion but you also require more light to illuminated the scene adequately.
Note that this number is based on the assumption that your filed of view is 5m. Estimate your exposure time based on the actual size of your field of view.
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Chronos User Discussion / Re: Exposure time setting.
« Last post by garagesip on January 02, 2024, 01:04:06 AM »Use exposure within as few micrometers as possible while still having enough light to capture video. The longer the exposure time, the more motion blur the image in your frame will have. You can set the exposure to anything between 1 and 79.49 microseconds.
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Chronos User Discussion / Re: Exposure time setting.
« Last post by wilkinsonwilfrid on January 01, 2024, 08:52:05 PM »I suppose I'll attempt to address my own question. Get enough light to record video with the fewest microseconds of exposure feasible. Your frame photographs will exhibit greater motion blur if you increase the exposure time.
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Chronos User Discussion / Re: Sigma lens less price to alternate Sigma 24-70mm f/2.8 Nikon F zoom lens
« Last post by carterodell on January 01, 2024, 08:49:04 PM »An excellent all-around lens for the Chronos 2.1 HD camera is the Tamron SP 24-70mm f/2.8 Di VC USD G2. It has great picture quality, is quick, and sharp. For steadier shots with slower shutter speeds, the vibration compensation is a lifesaver.
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Chronos User Discussion / Re: Chronos 1.4 and 2.1 lowering bit depth to increase frame rates?
« Last post by B.H.V on December 29, 2023, 07:58:41 AM »Lower bit depth data must be physically recordable by the cameras' sensors. In the event that the sensors are only meant for 12-bit capture, it could be challenging to achieve lower bit depths using firmware alone.
Yeah true.
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Chronos User Discussion / Re: Chronos 1.4 IR Filter Dimension Size Confusion?
« Last post by B.H.V on December 27, 2023, 08:00:58 AM »yes the answer you have writes is perfectly fine
Not really, because this shows the 2019 revision has it at 18mm and 18mm but the 2020 revision as 15mm X 15mm which would not make sense.
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Chronos User Discussion / Re: NEW: Chronos 4K12 and Chronos Q12
« Last post by paulsmith6193 on December 27, 2023, 07:57:27 AM »hi you are right
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Chronos User Discussion / Re: Chronos 1.4 IR Filter Dimension Size Confusion?
« Last post by paulsmith6193 on December 27, 2023, 07:55:43 AM »yes the answer you have writes is perfectly fine