Quote:
Originally Posted by Merlin66
Re original OP....
I used a 320mm f5 (1560mm fl) - Canopus 320 for many years in the 80's to visually check many, many of Greg Thompson's initial draft "Supernovae search charts" down to 15.5 mag. Generally a 12.5mm UO Ortho eyepiece....
Would be interesting to see how this would perform with today's CCD's.
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Assuming the optics are well corrected, quite well I'd expect. Imagers such as Shriaz certainly have pushed into the outliers of what is possible at that FL.
A big budget is hardly germane to the discussion as Rolf (across the pond) has proven time and again.
The fact remains, galaxies typically have small angular sizes and are faint.
Many of us don't have the luxury of time or clear weather to gather the data hence using a big scope simply makes sense.