Re: [APML] Suggested Astrophoto Accessories for Vixen VC200L

[Alen Koebel <alen_koebel@yahoo.ca>]

William R. Mattil <wrmattil@ix.netcom.com> wrote:

> And yes the appropriate T-Ring does come with 
> the OAG. These are not standard T-Rings but 
> are modified so that the couple directly to 
> the OAG via a locking system. But a regular,
> garden variety T-Ring will not work with the 
> Lumicon OAG.

In my experience, that's not quite correct. I have 
two 2-inch Newtonian Easyguiders, one configured 
for Olympus, the other for Pentax. When I bought 
the second one (for a song at a star-party swap 
meet) it was configured for Canon cameras. As I 
did not want to send it to Lumicon to modify it
for my Pentax I took a good look at it. The 
attachment on the camera end of the OAG is simply
a T-ring with the center part removed (the part 
with the T-thread). That's the extent of the 
modification! The three small set screws that 
normally hold the center part in now clamp it
to the OAG body. Changing my OAG for Pentax 
required only that I remove the old centerless 
Canon ring and install the equivalent part from
a Pentax T-ring. 

As the "modification" to the T-ring is trivially
easy, I would tend to say it is still a garden-
variety T-ring, or half of one at any rate! It's 
a good thing that the center part is removed,
actually, because that part nortmally does 
vignette the film. 

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