Author Topic: 600D Recording with Sensor Crop 1:1 Pixel Ratio  (Read 4317 times)

Windston

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600D Recording with Sensor Crop 1:1 Pixel Ratio
« on: December 17, 2015, 07:25:56 AM »
This is especially important for planetary imaging on the astrophotography side of things.
This would be awesome to see on the 600D.

Is this possible

Walter Schulz

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Re: 600D Recording with Sensor Crop 1:1 Pixel Ratio
« Reply #1 on: December 17, 2015, 07:29:19 AM »
Not exactly sure what your problem with ML's features is. You can do framing very well by creating a 1:1 cropmark.

EDIT: You haven't got into detail about why this feature is so important. Please explain for non-astros.

Windston

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Re: 600D Recording with Sensor Crop 1:1 Pixel Ratio
« Reply #2 on: December 17, 2015, 08:04:52 AM »
No, I should have been more clear. I dont want a 1:1 crop, I want video that is a 1:1 pixel ratio from the sensor, no downscaling as this Thrashes fine planetary detail. Like the 550d Movie crop mode, 5x zoom at 640*480, which only uses the central 640*480 pixels of the sensor.

Walter Schulz

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Re: 600D Recording with Sensor Crop 1:1 Pixel Ratio
« Reply #3 on: December 17, 2015, 08:23:42 AM »
- Load MLV_REC.mo
- Restart in video mode and press zoom button (5x)
- Activate "RAW video (MLV)" -> Aspect Ratio 1:1
- Decrease resolution until "1:1" is actually set.
- Done


Ihoujin

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Re: 600D Recording with Sensor Crop 1:1 Pixel Ratio
« Reply #4 on: January 04, 2016, 08:43:29 AM »
I know your question has already been answered, but I thought I'd share my thoughts on tricks to use with it.
Note, I haven't had ML long, and am waiting for the opportunity to try this myself, but I think it'll work.

So, Besides 1:1 crop, there are cases where something else could be useful. For instance since 640 by X is the smallest resolution you can choose. Using something like 5:1 will crop the image down to 640x128. For planetary images that only take a small portion of the frame, this will help keep the buffer from overflowing and  in theory reduce overall file size by 5x.

To plan your framing. I use Stellarium, with it you can simulate the FOV your camera and telescope can produce. I can tell you that with my 1000mm F/5 scope, using 640x128 (5:1 crop) I can easily fit the bright Jupiter and the 4 dimmer Galilean moons in one frame. Coupled with HDR video, I think I can simultaneously capture properly exposed frames and compose them in post.

To config Stellarium the 600D sensor has these attributes.
Resolution: 5184*3456
Chip Width: 22.3
Chip Height: 14.9
Pixel width and height: 4.3
From there adjust resolution and chip size proportionally for custom crops.
You will also have to configure your telescope specs, eyepieces and barlows.

Enjoy.
Canon EOS T3i (600D)
ML v: Nightly.2015Nov15.600D102.Datensuppe