2" vs 1.25" Diagonal

Assuming both diagonals are of similar optical quality, is there any benefit
to using a 2" diagonal with a 1.25 adapter vs. using a 1.25 diagonal?

Thanks
Brian A

Hi:

Nope. None. Other than that you can use 2" eyepieces (and provide a secure
home
for big 1.25" or 1.25"/2" eyepieces).

Peace,
Rod Mollise

Sometimes there is a disadvantage to using a 2 inch Diagonal with an adapter.
Some scopes do not have enough infocus for some eyepiece combinations. A
Pronto will not reach focus with a UO Ortho and a Ultima barlow unless one
switches to a 1.25 inch diagonal.

jon

Sometimes there is a disadvantage to using a 2 inch Diagonal with an adapter.

Some scopes do not have enough infocus for some eyepiece combinations.

Hi:

It's not the infocus that's the problem, usually, Jon, it's Outfocus. The
average 1.25" - 2" adapter may put the eyepiece, the 1.25" eyepiece too far out
to come to focus.

Peace,
Rod Mollise
Author of _Choosing and Using a Schmidt Cassegrain Telescope_
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