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[ATM] Triplet

Hi All,

As my next Project I would like to make a 5" or 6" APO or semi-APO
triplet around F8. I am looking for advice on the design and glasses
to be used. I would like to use easy to get and work glasses, no
exotic ultra expensive  or no longer produced glass. I like the idea
of oil spaced since it means a lot less work. My budget is about US$
500 for the glasses. Any suggestions?

Regards,

Alfredo
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