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G'day MortonH,
I'm most keen on the replies your thread gets.
I'll be taking delivery of a RDF hopefully tomorrow morning. I'll be piggy backing it to a 76mm reflector, 300mm fl, and using it in turn as an over size finder. This monstrosity I'll be mounting onto the tail end of my 17.5" dob. The dob also has a 50mm straight through finder near the focuser.
I find that unless I'm using a 50mm finder in Sydney's eastern suburbs (home), I really struggle to pin down targets. A 30mm finder doesn't cut it here.
At a dark site, a 30mm does just fine!
The reason for the finder piggy back assembly is three fold: I don't need to climb the ladder to do the first gross find after a big move of the scope; the RDF will give me (I hope) the straight through sighting I most feel comfortable with; the 76mm reflector with cross hair EP will be used for fine aiming & quick scope nudge when showing people the sky & not need to have them come down for me to do the 'nudging' to recentre the target.
I'd suspect that if most of your viewing is from Sydney's east, a 50mm finder may be more the go. Out in the sticks, an RDF.
Mental
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