Quote:
Originally Posted by gregbradley
Guaranteed better than .95 strehl.
|
The triplet APO's 100-130 mm seems to be a sweet spot for sure, and at a stretch to 140, maybe 150mm great... but... beyond that they're impossible in terms of size, weight, the mounting required and sheer cost.
OTOH no such thing as a 9" refractor that is reasonably portable in a small car. But a 9" mak does (or dob or SCT), and this one is 0.965 strehl, for a fraction of the price of an equivalent refractor.