GSO RC8 First Light Images

[dugnsuz (Doug)]

Originally Posted by Marke

Doug how are you using the reducer , its designed to be used like a nose piece and as such probably better kept closer to camera but you can also screw it onto a 2" nose piece to put it along way into the focuser and see if its better or worse. Mine screws straight onto the front of my oag and acts as the nose piece in this case.

Interesting point Mark.
Mine is set up...
T Ring >Baader 7.5mm spacer > 2" camera adapter > Reducer

as per...
http://www.teleskop-express.de/shop/...or-GSO-RC.html

[Marke (Mark)]

Doug the AP site has a pdf of configurations that may help.

[dugnsuz (Doug)]

Originally Posted by Marke

Doug the AP site has a pdf of configurations that may help.

Thanks Mark - problem seems to be the physical position of the reducer in the baffle, but also needing to use the setup as described to you above to maintain correct reducer to sensor distance.

Would it be feasible to pull the reducer+DSLR slightly out of the focuser by a set distance, then set that distance with a parfocal ring? In this way the reducer would sit further down the baffle, and hopefully out of the reflection zone.

Could anyone comment on that idea?
Cheers
Doug

[Marke (Mark)]

There is no critical dist for a FR not like a flattener , you can put it pretty much where you want only thing that effects is the amount of reduction.
You could try that but may be a bit tricky to reproduce

[gbeal]

While I haven't done too much with my RC8 and AP67CCD, I don't get these reflections. I used mine attached to a Baader T to 2" nosepiece IIRC, and nothing else, and with the whole lot stuffed as deep as it would go into the 2" FT. Maybe try the slightly different spacing. Mine plate-solved at 1106mm I think.
Gary

[Poita (Peter)]

So you get no reflections with the reducer out of the picture. What if you put a clear filter where the reducer normally would sit?

[dugnsuz (Doug)]

Forgot to add that I had my clip in IDAS LPS filter sitting over the sensor too. Too many variables for reflection possibilites (although the LPS was still in place with the no reflection/no reducer image).

The Tarantula pic was taken with the reducer in place without any reflections too - no bright stars to complicate things I suppose!?

[TrevorW]

Good luck with it Dougie they are a nice scope for the price
earlier models of the RC showed reflections I believe the design of the baffle on the newer models was changed to lessen this effect