I don't believe that you will get any optical benefit out of using a 2"
diagonal with 1.25" eyepieces. I have a Meade diagonal with the Schmidt
threads. Unless you add a washer or o-ring, it sometimes locks down on
the scope, i.e gets tough to loosen. This can be a pain when frequently
adjusting the orientation of the diagonal. I use an industry standard
no. 2-133 o-ring (1-13/16" x 2" x 3/32") although some folks recommend
cutting washers out of a margarine tub lid (I think they use one behind
the collar too.) I figured a $1 modification made the cost savings of
the Meade worthwhile as compared to the Tele Vue diagonals, although
most folks seem to regard the Tele Vue products as optically superior. I
would definitely say that the Meade is "decent."

I like the 2" diagonal especially for 1.25" eyepieces that have a 2"
skirt. Either with or without an 1.25"-2" adapter, this seems like a
much more robust way to couple these heavier eyepieces to the scope.

Danny Cobb

Heath, Andrew wrote:
>
> Hi all,
>
> Can anyone tell me whether there is any advantage to using a 2" diagonal
> with 1.25" eyepieces?
> The thought behind the question is the amount of available light getting
> through to the eyepiece.
>
> Can anyone recommend a decent 2" diagonal?
>
> Many thanks,
>
> Andy.

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