[DJT (David)]

Originally Posted by Peter.M

Though I have never used them, I always wondered about using an RC8 and these two with a 2.5 inch moonlite

http://www.teleskop-express.de/shop/...size-sens.html

http://www.teleskop-express.de/shop/...Flattener.html

It is attractive because it would be all threaded, has room for an AO unit if wanted and would hopefully provide a large corrected circle.

Thanks Peter for the links. I tried a new HA filter the other night which confirms I really should go the OAG route so will see what what transpires on that side of things. It would be interesting to see what TS can do for the various adapters for the OAG, whichever one I end up with. Moonlight do one for the 2.7" AP adapter that comes with the MonsterMOAG which is a fair bit cheaper than the TS one, which is good to know.

Jury remains out on the flattener still though, at least until I get another chance to look at collimation.

Originally Posted by Meru

... I managed to get it pretty much bang on with just those tools and this guide - http://www.deepskyinstruments.com/do...re_Ver_1.0.pdf

...

Thanks Meru
I had a good look through the DSI link. Really pleased with that as it provided a very good explanation of what is going on with the RC as well as the procedure. Again, waiting for clear skies to try this out but thanks for the link.

The original point on this I suppose is that with the internal guide sensor being above the imaging one, its picking up stars which show some astigmatism for calibration and guiding purposes and the concern is whether or not this impacts guiding. Am only just getting to grips with CCDSoft for acquisition anyway so as I get through the learning curve this may not be a big issue after all but if it is then at least there are options for correcting the image by the looks of things.

Collimation actually seems pretty well "balanced" based on the link by the way, but always worth another look.

Thanks for the responses everyone, very helpful indeed.