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Old 26-02-2007, 06:14 AM
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iceman (Mike)
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Join Date: Sep 2004
Location: Gosford, NSW, Australia
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Lightbulb Image Scale Comparison - 10" vs 12" newt

I finally managed to get the data needed to do a comparison.

I couldn't really do a comparison on Jupiter as even when they were they same angular size (35.1"), my 10" Jupiter images were taken with a ToUcam whereas the 12" Jupiter image was taken with a DMK21AF04 (with filter wheel etc acting as an extension).

But this comparison is with the same 5x powermate, DMK21AF04 + filterwheel, with the only difference being the tube - between my old 10" newt vs my new 12" newt. The diameter of Saturn in both cases is the same (20").

10" newt - f/5 - 1250mm FL
12" newt - f/5 - 1500mm FL

The extra focal length is of course magnified with the powermate + extension tube.

Both images taken at 15fps (1/15s exposure), with the OTA on an EQ6.

I love the extra image scale my 12" gives!
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