[multiweb (Marc)]

Originally Posted by AlexN

2 more great shots Marc.. That setup is really showing some promise! How did you find the resulting colour balance after using the UHC-S? What are the benefits of using a UHC filter at a dark site? improved contrast between the nebulosity and the sky background? Does this at all interfere with the dimmer nebulosity or is that simply a matter of more exposure?

Does it in any way tighten stars up a bit like an NB filter would?

Sorry for the myriad of questions.. Just trying to figure it all out !

Thanks Alex. I just used it that night because the transparency is so good up there that I usually get internal reflections so the filter although designed to enhance nebulosity tend to tame the stars a bit. But I don't think you really need it under darks skies. You do need slightly longer exposure but no by much. It also pushes your red channel right up so you need to take that into account when processing and color balancing.

Originally Posted by renormalised

Marc, those are fantastic. Great work

Thanks Carl - glad you liked them.

Originally Posted by h0ughy

great shots, like the result

Thanks David.

Originally Posted by Martin Pugh

Well done Marc. You've processed the trapezium well in this image.

cheers
Martin

Thanks Martin. Yes the barlow gives me a 1arcsec/pixel image scale. I have more pixels to play with at processing time and it makes it a bit easier to bring out the data.