Gassendi crater - monochrome RGB versus OSC comparison (Niall MacNeill)

Contains: Solar system body or event

Gassendi crater - monochrome RGB versus OSC comparison

Acquisition type: Lucky imaging

Gassendi crater - monochrome RGB versus OSC comparison

Acquisition type: Lucky imaging

I continue something of a series to look at variables when doing lunar imaging, bearing in mind this would be applicable to planetary as well. I hope you find this of interest.

The left hand image is the recent one I took of the Gassendi crater using the classic monochrome RGB process under good seeing conditions. This was acquired with the 174MM camera with 5.9 micron pixels and a 2.5X Powermate to give a pixel resolution of 0.12 arc seconds.

For the other image under the same seeing conditions, I was looking for a much wider field view, so I used the 1600MC a OSC camera, which has 3.8 micron pixels, with no focal length increaser giving a pixel resolution of 0.2 arc seconds.

The monochrome RGB image is clearly vastly superior. There is some difference due to the fact the OSC image is under sampled.....I should have used a 2X barlow to have proper sampling, whereas the monochrome RGB image has close to the optimal pixel resolution.

The other factor is that the OSC has a bayer matrix and for every block of 4 pixels there are 1 red, 2 green and 1 blue filters. This reduces the sensitivity because only 1 in 4 red or blue photons can be recorded and only 1 in 2 green. Equally, this is like 2x2 binning, because 1 or 2 pixels in a block of 4 are recording data, so there is an impact on pixel resolution.

However, for my very wide FOV OSC image, this resolution is more than acceptable.

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Gassendi crater - monochrome RGB versus OSC comparison

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