vlnikolic wrote: ↑Sun Aug 01, 2021 3:07 pm
thank you OleCuss for your fast reply!
hm, yes aberration is an issue with the short refractor for sure.. and magnifications stated from bresser are exaggerated totally..
i thought that for my purpose of having telescope, and my price range maybe meade is the best from these.
if you have idea of another cheap scope -please post
: )
To do our best we'd need to know what your budget is and what vendors will work best for you.
Best value for astronomy is usually a 6-8" Dobsonian telescope. I don't find them to be all that great for terrestrial use.
After I got it I found that my most-used scope for astronomy as well as for terrestrial purposes was a good 100mm spotting scope. The 45 degree angle of the eyepiece was very important for astronomical use.
It's not cheap, but Celestron's Regal M2 100ED will do good work for terrestrial and for astronomical purposes. And do note that you will have an erect image as well as the 45 degree eyepiece arrangement.
You can go on birding sites and find plenty of others that will give you excellent views. Mine is a Swarovski and was affordable because I got it used.
I know I keep going back to the spotting scope and there's reason for that. A whole lot of astronomical telescope have mounting, delicate construction, or optics which do not give you properly oriented images (we don't normally care in astronomy).
The fast optics you find in the Infinity you linked. Let me tell a bit of a story which might illustrate.
I did a fair bit of public viewing events. At one I had brought my 10"
SCT and was set up near a guy who'd brought a beautiful 5" achromatic refractor with fast optics. The light pollution is horrible in that location so we mostly did planets and I think we were all aimed at Saturn that night.
I had a couple who came from that beautiful refractor to my 10"
SCT. They were puzzled that my
SCT couldn't show the purplish ring around Saturn! I was stuck having to explain to them that the beautiful refractor's optics were showing them a pretty bad aberration.
Yeah, fast achromatic optics give you pretty lousy views on some targets. I find it quite disturbing for terrestrial targets in general although for most dim deep-sky targets I find them quite unobjectionable.
Even when you get a spotting scope which is not at all top end, they have been using their market power to get good value glass and very good optical designers to give you a surprisingly good view at a competitive price. They have to do this because otherwise they won't compete successfully.
For terrestrial use I find the scope more likely to get banged around or to get wet. My astronomical scopes were not designed but the spotting scopes could handle that kind of thing very nicely.
Also note that for terrestrial use you usually just can't use a lot of magnification due to all the heat differences and aiming through haze and such. So going big just doesn't work all that well.
A great triplet or ED-Doublet astronomical telescope has wonderful optics for both terrestrial and for astronomical viewing. But you have to get an erecting device and I've gotten the impression that many of those aren't all that great whereas the good spotting scope will have that designed in very well. Handle them with care. . .