Re: [tec-scopes] Re: Collett Focuser Clamp and Cold Weather
You would not be able to do this with the metal collet. The PBS collet
is not designed to grip an eyepiece sleeve so tightly it cannot be
twisted round. The metal one is. The advantage of the PBS collet is
that it will not scratch or score your eyepiece sleeves.
Just take my advice and get two backs, one with each collet type.
On 29 Feb 2008, at 21:29, Gedas wrote:
> Intrigued by this discussion about the looseness/tightness of the
> stock collet in cool weather it forced me to run out to the
> observatory to try it out first hand. I slipped in two different WO
> 2" diagonals and gave the collet ring a pretty good twist with both.
> Surprisingly, it was not at all difficult to twist the diagonal right
> out of the focuser. I then proceeded to twist the ring tighter and
> tighter, but each time still able to twist the diagonal loose and out.
> I find this very disturbing since my normal load will be an expensive
> camera. I guess my question is can I apply an extremely firm twist to
> the ring without damaging anything inside the assembly? I suspect with
> more torque than what I was applying things might solidify but I was
> afraid to proceed. Any thoughts on this?
- Michael,You can tether the bino assy as a temporary fix. That's what I did ;-). I stitched the ends of heavy shoelace and noose locked it around the base of finder bracket on scope. The neck of the mark 5 bino is narrower than the diagonal so that's where the noose at the other end went. While I have the compression ring assy on my 3545 focuser now, I still tether the assy to avoid a SECOND catastrophe, in MY case, concrete :-(.Good luck!Mark
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