[ATM] Need Design Suggestions for a 16" f/1.1 Spherical Mirror

["matt" <electro_optic@bellsouth.net>]

Hello group,

I am contemplating design options for a scope that would put to use one of
the mirrors I have sitting idle collecting dust.
It's a good quality, Pyrex mirror , very fast, with a focal length of only
450mm for an aperture of 405mm . It is spherical, already coated , and I'm
trying to find a design that would minimize the amount of remaining actual
physical work . I do not wish to embark on a long journey with this project,
so the most expedient solution would be preferred.

I will definitely NOT build a Maksutov or Schmidt Cassegrain corrector plate
of 405mm diameter, or even more work, Lurie houghton or other full aperture
correctors. I'd even prefer a Gregorian configuration, to have a concave
secondary as being easier to test . At this primary focal length, the
Gregorian configuration is not impractical , the overall tube length would
still be very compact .

I'd prefer some sort of all spherical design, with a subaperture corrector ,
like the 13" Vixen VMC330L (and its smaller sibling VMC260L ) , which are
advertised as having a 2 element corrector behind the secondary :

http://www.vixen-europe.com/htm/teleskope/reflektoren/vmc330l.htm

Although obviously Vixen is selling this type of scope, I haven't found
literature references analysing this design type.

I would appreciate any pointers or references , besides playing all weekend
with Oslo (which is what I am currently doing, and planning on doing next
weekend as well ;-).

thanks,
matt tudor



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