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Old 14-08-2011, 03:26 AM
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Tandum (Robin)
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Qhy9 oag

Who has an OAG on a QHY9 that does not intrude on the imaging path?
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Old 14-08-2011, 10:19 AM
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RickS (Rick)
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Robin,

The SX OAG on my H-18 doesn't appear to cause any vignetting in flats if it's moved as far as possible away from the optical axis.

Cheers,
Rick.
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Old 14-08-2011, 11:36 AM
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And a mate down country has one, he is a forum member.
But I don't think he has used the TS OAG on his QHY9, yet. Still hooked on the finder-guider.
Gary
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Old 14-08-2011, 05:02 PM
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Quote:
Originally Posted by Tandum View Post
Who has an OAG on a QHY9 that does not intrude on the imaging path?
Robin I posted a setup on this ages ago. I used TS-OAG9 with a 48mm coupler on the standard QHY FW with a bit of modification to the nose piece. Worked a treat but was not easy to find a guide star as there is not a lot of movement to rotate the prism. It did not affect the light cone as it had a clear 48mm aperture right through. Here are some pics.

Pic 1: the standard nose piece with the thread on the wrong side.
Pic 2: I machined off the 2" nose leaving only the 48mm internal thread and the 54mm external thread.
Pic 3: Side view only takes 3mm of back focus when fitted to the FW.
Pic 4: Modified nose fitted to FW.
Pic 5: TSOAG9 attached to the 48mm internal thread of the modified nose piece (OAG comes with a T thread coupler but you can also get a 48mm coupler which is used here).
Pic 6: WO nose piece with FF attached to the OAG. Distance to chip was exact for the TS optics FF.

I don't use it anymore as I have a FLI 7 pos 2" FW and have not got around to making the required adaptor. Weighs a tonne anyhow and not sure if the OAG would hold it.

Mark
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Last edited by marki; 14-08-2011 at 05:27 PM.
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Old 15-08-2011, 01:26 PM
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Tandum (Robin)
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Cheers guys. I remember that one now Mark. I'll have a shot at moving the prism up on this orion first.

[edit]
Got the prism moved and can still see stars with it so I probably should have done that ages ago

Last edited by Tandum; 15-08-2011 at 09:47 PM.
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