Quote:
Originally Posted by Tandum
Who has an OAG on a QHY9 that does not intrude on the imaging path?
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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