My piece of string is in the length of a full set of TV Radians , they work especially well in both my iStar and C9.25 .
They do impart a slight yellowing ? to the image but for Luna/Planetary viewing I think it makes the image a lot more natural looking especially Jupiter and Saturn and at stupid high powers of 500x plus ( on good nights ) dont show any problems to my eyes .
Before that I used Orthoscopics , very good in the C9.25 but a little to much edge distortion in the iStar , still very good tho as Bob says in above f6-8 scopes and the best for above f10-15 as that's what they were designed to work with .
You only really use the centre of field when viewing planets but the moon is a different story so that's why I went Radian's ( the 20mm eye relif don't hurt also ) and I am mostly Lunar/Planetary like you .
But TV Radians are where its at for me , these are also avaliable used for good prices now as many have upgraded to the Delite's and Delos range . .
Brian.
Quote:
Originally Posted by Tropo-Bob
How long is a piece of string?
It depends on your scope. For longer F ratios above F6, I suggest a ortho or plossl, especially if the mount has a drive.
I also like the Delites and the old Radians when viewing the Moon at higher magnifications. They give a good image to the edge of the field.
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