From: "Frank Q" 
To: 
Reply-To: "Frank Q" 


Hi All

My personal preferences:  1) NOT pierce the primary. If the surface has a
good figure, piercing it
might ruin it.  2) You run the risk of scratches.

I like Greg's options, especially the Lurie-H **IF** you have a spherical
mirror. You can make the
correctors out of plate glass (as someone else on the list has done). Here
the advantage is that
the glass is relatively cheap and you'll have a good instrument for very little cost.

My 2 bob's worth
Frank Q

>
> With that fast of a mirror I would say off-hand, Schmidt-Newt, Mak-Newt or
some other type of corrector-Newt (Lurie-Houghton, Ross).
>
> Are you willing to pierce the primary?  How about a Cass Variant?
SCT,Mak-Cass, RC.
>

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