[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

Re: [ATM] Un-SPAM

Bob May wrote:
> Yep, it is time to end the discussion.  It has devolved into
> other things not related to the problem that I am having.
> Lets get back to telescope making.
> I, for one hhave a big backlog of Snashel designs that need to be
> mulled over.  It may be that one of them would be nice for a
> project..
> I'd like to see him do a daylite design with BSC1, F2 and some
> SK11, BK7, SK16 or SF11 that would give a nice scope at around
> f8.

This design is a rework of a double-cemented Petzval to 100 mm
f/8.  The glasses are "common", but not the ones you listed:
N-K5, F2, and N-SF5.  I chose them for their expansion rates
and the fact that, by tweaking the color correction, they allow
for both lenses of the Petzval to be cemented.

In spite of this, it is still, I think, classified as ananastigmat;
in addition, the lateral color error is also achromatic, in that
the F and C lines coincide.  The visual Strehl is 0.8038, making
it "diffraction limited".


    http://users.rcn.com/rflrs/Ptz09-06x.atm   ATMOS input file
    http://users.rcn.com/rflrs/Ptz09-06x.len   OSLO input file
    http://users.rcn.com/rflrs/Ptz09-06x.txt   TEXT prescription
    http://users.rcn.com/rflrs/Ptz09-06x.zmx   ZEMAX input file


_______________________________________________
ATM mailing list http://www.atmlist.net/