Re: [ATM] Preannouncement (ECDK)

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

Richard F.L.R. Snashall wrote:
>
> Then, too, that you cut your corrector out of a square piece
> of glass and started the process by making the octagon.  Why
> not do something with those triangles?
>
> For example (508 mm f/10, double-sided corrector):
>
>     http://users.rcn.com/rflrs/rc6-88x.atm   ATMOS input file
>     http://users.rcn.com/rflrs/rc6-88x.len   OSLO input file
>     http://users.rcn.com/rflrs/rc6-88x.txt   TEXT prescription
>     http://users.rcn.com/rflrs/rc6-88x.zmx   ZEMAX input file
>
> If I've done my arithmetic correctly, the diameter of the
> maximal blank that can be cut from the triangles is about
> 18% of the diameter of the corrector cut from the square.
> This design fits in that 18%.
>
> This uses some of those triangles, corrects the coma, and
> flattens the field some.

Yup... somebody got me thinking about this again.

But what to do with the other two triangles?  Well... you'll
need a finder (75 mm f/8):

    http://users.rcn.com/rflrs/Ptz10-21x.atm   ATMOS input file
    http://users.rcn.com/rflrs/Ptz10-21x.len   OSLO input file
    http://users.rcn.com/rflrs/Ptz10-21x.txt   TEXT prescription
    http://users.rcn.com/rflrs/Ptz10-21x.zmx   ZEMAX input file

Has a four degree FoV (42 mm diameter) flat field.  Visual
Strehl is 0.7987 to 0.7796, but, remember, this is B270 we're
talking about here.
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