woodhornbirder
Well-known member
I bought one of these recently 2nd hand.
http://www.celestron.com/c3/product.php?ProdID=203
comes with a 45deg prism. ANy suggestions about these affecting image quality for terrestial viewing? How do I work out what is a good prism and what will deterioate the image?
[do i mean diagonal? is that the same as a prism?]
I have some ep left over from my pentax 80mm. inc a 16mm uwa williams optics. (75x 82 deg)
Not expecting it to be much use past 80x due to dull image but in theory it would go over 100x.
I think in english ave light it will be impractical to push it past 70x.[focal length=1200]
Have used cheapy mak scopes and been impressed with the lack of colour aberation, however this is balanced by a lower contrast image.
Scope should arrive next week...just in timef for my birthday....:-O
http://www.celestron.com/c3/product.php?ProdID=203
comes with a 45deg prism. ANy suggestions about these affecting image quality for terrestial viewing? How do I work out what is a good prism and what will deterioate the image?
[do i mean diagonal? is that the same as a prism?]
I have some ep left over from my pentax 80mm. inc a 16mm uwa williams optics. (75x 82 deg)
Not expecting it to be much use past 80x due to dull image but in theory it would go over 100x.
I think in english ave light it will be impractical to push it past 70x.[focal length=1200]
Have used cheapy mak scopes and been impressed with the lack of colour aberation, however this is balanced by a lower contrast image.
Scope should arrive next week...just in timef for my birthday....:-O
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