Quote:
Originally Posted by [1ponders]
There must be something wrong with the compression ring on my NGF-C then 'cos the sbig sags like it's got a rubber crutch.  |
Hi Paul
I have not enjoyed much success with compression rings and heavy cameras.
My JMI NGF-CM had a single locking screw and a brass compression ring that appeared to work fine on eyepieces. As soon as I began to use the ST7, I noticed a sag although it appeared to be a “fixed” sag rather than vary over a session.
So, I removed the compression ring and drilled & tapped 2 further holes at 120 degrees for an extra two locking screws. My main concern with this modification was the potential for tilting the inserted adapter in the draw tube if I did not tighten each screw the same. However, this has not appeared to be a problem, so far.
My problem with the Moonlite/Tak eyepiece adapter combo was that the Tak 2” adapter was very shallow and by sheer coincidence, the compression ring of the Moonlite just nipped the grub screw cut-out “lip” of the Tak adapter, making it rock in situ, as its shallow insert depth did not provide sufficient longitudinal stability that a longer length adapter would have provided.
Cheers
Dennis