The Window Sill Observatory

October 25, 2011

Gain v Image Quality on Solar Images – Results

Filed under: Software, Sun — Dave @ 3:26 pm

Tester Mike has created a batch of 8 solar images to compare the effects of gain, shutter speed and frame rate on solar image quality. He then offered them up to the test team to pick their favourite image and the results were very interesting. The images are shown below and the exposure settings are at bottom.

Incidentally, DSSR can create camera response curves to help you choose the best settings for your images. The last image above is the Gain v Level curve for a TIS DMK 21AU04. Level is the mean pixel brightness across the image with 0 = black and 2550 = white.

Results

Mike took all the images using a DMK21 Camera on a Solarmax40 and a 2.5x Televue Powermate with the following settings.

Time Subject Gain Shutter fps
12 17 47 Disc in Ha 400 1/250 60
12 18 12 Disc in Ha 400 1/250 30
12 19 31 Disc in Ha 300 1/185 60
12 19 56 Disc in Ha 300 1/185 30
12 21 09 Disc in Ha 500 1/435 60
12 21 31 Disc in Ha 500 1/435 30
12 27 38 Disc in Ha 600 1/714 60
12 29 16 Disc in Ha 600 1/714 30
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