[AZ-Observing] Re: Compression Ring
- From: Bob Christ <bchrist@xxxxxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Tue, 30 Aug 2011 10:35:29 -0700
Stan, that tapered portion is designed to provide assurance that the diagonal
will not fall out if the fastening tension loosens-up. This is a good thing.
My diagonal too has the taper and my visual back employs a compression ring,
and the combination works beautifully. I remove the diagonal every time I
transport my scope and there is zero evidence of the compression ring being
torqued; this after many uses.
Bob Christ
On Aug 30, 2011, at 10:11 AM, Stan Gorodenski wrote:
> The 2" barrel of the diagonal that slides into the back end of my
> refractor is tapered where it is screwed into the diagonal housing. The
> taper is about 1/2" long. The back end of the telescope has a
> compression ring that clamps on the barrel. I am an old timer who does
> not have the experience with this new method, i.e., the compression
> ring, of attaching an eyepiece, or in this case the barrel of the
> diagonal. Sliding the diagonal all the way into the back end of the
> refractor would ensure it does not fall out. However, it seems to me
> that this would put a twisting force on the compression ring because of
> the taper. This does not seem good, but I cannot see any other reason
> why the barrel is tapered for about a half inch before it screws into
> the diagonal housing. Should the compression ring be tightened over the
> tapered part of the barrel, or the parallel part of the barrel?
>
> As an old timer I prefer the traditional method of attaching eyepieces,
> etc. - thumb screws that directly hit a barrel. On can machine a small
> groove so that the part does not fall out. One cannot do this with these
> (blasted) compression rings. A number of years ago I had a heck of a
> time getting an eyepiece out. The compression ring just wouldn't
> de-compress but finally did.
> Stan
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