[Atmswap] RE: TDE and the 13.5" Diameter F # 2.4 Schmidt System Available

[Sidor . Kurt]

Dear List,

If you noticed the TDE on the primary mirror I just wanted to add that this
is masked down somewhat in the final assembly.  The mirror cell has a
retaining ring that clamps down over the 16" diameter.  I'm guessing that
the clear aperture (for the primary mirror only) is about 15.5" dia or less.
I have the retaining ring at home and will have to measure it, the Ronchi
image was taken without it in place. 

Thanks!

Kurt Sidor
Mechanical Engineer
Dynamics Research Corp.
Encoder Division