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Re: [ATM] Cass mirror separation

> If your secondary holder assembly has a large travel
> distance (as pro's motorize their secondary holders
> and focus with it - not at the eyepiece end as atm's
> do)



Why would the "pro's" focus with cass secondary when the separation of the
cass secondary is critical w.r.t. aberrations? The atm's are correct in
focusing at the eyepiece, keeping the secondary spacing at the optimal point
for minimum aberrations..





Don Clement

Running Springs, California

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