Re: [ATM] Corrector cell design

["Bob May" <rmay@nethere.com>]

Sorry to be late on this but one design is to support the lenses
at the edge of the glass with the necessary spacing with paper or
soft plastic and to drill the holes for the secondary support and
have the support clamp to one lens and just go through the other.
There is plenty of space between the lenses to put a good
clamping ridge on without any problems.  Don't forget to grind
the edge of R3 so that it doesn't want to break off at the edge -
that sharp edge may break off with an impact on the lens cell.
Also don't forget to put paper or thin plastic between the two
ende of the secondary holder to keep the clamping force from
breaking the glass that way.
Done right, you will be able to adjust the tip/tilt of the
secondary from outside the scope and by loosening the nut, be
able to rotate the secondary.
It is also wise to put a notch in the edge of the lenses and have
a square pin to keep the lenses from rotating.
Bob May
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