Quote:
Originally Posted by doppler
The big jump from a 180mm Mak is the f ratio, f15 down to f10 is a leap astro imaging wise. The C11 has the same focal length but is much faster. Resolution also increases with aperture. Of course the biggest factor for high magnification imaging is the need for good seeing, here in the tropics it's usually pretty ordinary.
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f10 is nice, but in planetary sometimes people even go higher to f20 or f25 even f30, so i assume that focal ratio isn't a critical factor here, they all mention aperture or focal length over f ratio.