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[ATM] Hamiltonian Refractor

Hi,

 

 

Doublet objective (180mm) and achromatic magnin mirror, but the beauty is in
the short BFL  1350mm with a focal length of 2850mm (also cheap glasses like
bk7 and f2). That means a neat folded refractor That looks like a newt. Ok,
yes it has a diagonal, but at 10% obstruction it should not pose any
problems with diffraction as mentions Roger in his site,  I have a tentative
Oslo file if any one is interested.

 

Regards,

 

Alfredo

 

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