Richard, What is an RBI Annihilator?!? I read the description of what it does from the links you provided but - what is it? I have an FLI PL16803 but I don't recall ever seeing anything describing it

Thanks for posting that, Paul. It is so faint that you have to be impressed that it was noticed by Mel Helm. Bill

Wow. That is a faint object, and, as you said, perfectly round. I hope you get a chance with other filters, so it becomes more defined. Bill

The 3 star method is very fast, as one can use the goto to get to each star, and certainly does not take 5 minutes. I continue to be amazed by the advice being offered by those who have not used the

the biggest problems I have are 1) the wind 2) portability is not so great since it takes some time to get setup and collimated when I tear down I haven't moved it since the summer of 2006 though so

VERY interesting. I'm not an imager, but currently researching a few points towards building a ~300MM F20 Dall-Kirkham. I was a little concerned about the FL of the scope and how it would work on

there's additional discussion on the object here: http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/2615448/page/0/view/collapsed/sb/5/o/all/fpart/1 and on AMASTRO and on

The appropriate credit for finding this object goes to Dr. Mel Helm operating out of Sierra Remote Observatories in California from images taken in July 08.. There's also followup imagery by Dr. Keith

Chris, The way the modeling alignment software works in the Gemini system is that after a rough manual polar alignment you center a star in the EP for your initial alignment, then do goto's to a two

Yes. And like Gemini's PAC, because it is so efficient and quick, they are procedures that you can start once stars become visible (or even before) and be ready to observe or image once it's dark

Oh. OK. It sounds like maybe folks might want to look into the meridian delay method of pole alignment then - it does what the three star method does, only easier. I've tried PAM, but never

Richard So if you "fill, flush then integrate" it seems you will be ensuring RBI artifacts. If you let the flush part go to completion then you're waiting for the storage time on the traps to run

Chris It's not. Jerry

www.narrowbandimaging.com/images/RBI_cbubble_mk1sn2_f12_pl9k_baader_ha_10x20min.jpg I marked things I identified to be RBI artifacts on the right hand side of the image In retrospect I wish I had

they may be Rick I had noticed the same things but I caution you that the blob on the right may be an RBI artifact: that's why I haven't raised the issue yet because I need to dig into the plates to

I had a peek at your scope picture. Looks nice. Maybe I'll rebuild and truss my 16" Newtonian at some point and add a Wynne corrector. Are you sure you have enough wires? ;-) My set-ups look the same

Chris, basically, following a two or three star alignment the software would calculate the alignment error and then ask the user to centre a star in the eyepiece using the alt/az adjustment on the

I didn't see it in the small image that first came up but it stands out well in the first zoom level. Very neat! There are two other suspect spots on that image. There is a small bright spot close to

Man, that's faint...joe :) "May You Go Among The Imperishable Stars" Joe Mize www.cav-sfo.com Chiefland Astronomy Village, Fla.

Just yesterday I became aware of a new "bubble nebula" in Cygnus near the Crescent. It is so perfectly round with such a well defined border that it really looked like a plate defect in the discovery