Quote:
Originally Posted by Alchemy
given the chart then a 350d for deep sky would be 600-1000mm range.
so whats wrong with 1500mm as it seems to work ok,( im not trying to be difficult)
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There is nothing stopping you from using the 350D at 1500mm. How optimal is the question. If we take the example of a C9.25 @ F/6.3 - it delivers 1480mm. Coupled to the 350D pixel size you get an arcsec/pixel combination of .90 arcsec/pixel.
Now ask yourself, how many nights a year will the seeing get below an average FWHM of 1 to take advantage of this arcsec/pixel combination?