From: "Dwight K. Elvey" 
To: atm{at}shore.net
Reply-To: "Dwight K. Elvey" 



>From: "Bill Kelley" 
>
>Hey Guys,
>
>I've aquired a number of 4 1/2" F8 and 5" F8 aluminized
parabolic mirrors of
>decent quality in cells with collimation adjustments. Also some tubes and
>mounting rings. Local ATM geeks are urging me to make up a couple of pairs
>into binos. It has been suggested that the mounting rings mounted base to
>base might be incorporated into the assembly of the tubes. Then the tubes
>could be rotated for interpupillary adjustment.
>Bino collimation is not going to be as simple as back to back mounting
>rings. Comments, ideas, caveats, please.
>
>Seeing Double?
>
>Bill
>

Hi
 Bino telescopes do require more adjustments but it
it truly worth the extra effort.
 Things I've learned.
1. Needs field rotation adjustment. 2. Each tube should have one degree of
adjustment,
    one tube for horizontal and one tube for vertical co-collimation.
3. Pivot for this adjustment is best near secondary/tertiary
  mirror ( if other mechanical, weight or such makes this
  practical ).
4. Have slots to adjust primary tube mount. When I changes something,
 I always find that the adjustment screws don't have enough range.
5. Consider using your own mount for tertiary mirrors. Most star
 diagonals will interfer for smaller inter-pupil distances.
6. You'll need larger secondaries than you'd normally use. Dwight

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