Quote:
Originally Posted by Peter Ward
Sooo... a C14 gathers more light than a 4" ?
I'd really like to hear from any Ceravolo dual FL owners on whether they see better S/N in the "fast" configuration.
|
As you know I have a C300. I also share another one at SRO. In my experience there is a significant SNR advantage in the f/4.9 configuration. This advantage comes at the cost of decreased resolution, of course, but provides a larger FOV.
One last thought on aperture... let's take the example of a 300mm aperture scope with 50% obstruction and a 50mm f/4 lens. The scope sucks down photons at 432 times the rate of the lens. If we assume that aperture is all important, then we come to the conclusion that all those DSLR astro images must be fake, or perhaps were taken over a period of several weeks
