Orion Nebula_1_ 01-14-2015

Comment

Comment by Philip A Cruden on January 19, 2015 at 8:07am

Hi William, I had a look at your image of Sirius. I remember this one from a while back because I commented on it. I was always under the impression that the SCT 8" Edge HD did not need a focal reducer because the Edge HD is already a flat field. In my case I am using the 6.3 F/R to flatten the field. It is frustrating to say the least. As you said it is for sure the F/R, if I remove it from the mix the reflections are gone but then I get the stretched stars on the edges. I am also using an external Crawford Focuser and if I remove that and put the F/R right into the barrel I gat crazy reflections like you did on Siruis.Never ending fun! Cheers, Phil

Comment by William Neff on January 19, 2015 at 7:23am

Hello Philip: I like the image of Orion nebula, The light band in the image is no doubt the focal reducer, your issue though is the opposite of mine with the SCT 8" Celestron Edge HD and focal reducer, no problem with images such as M-42, but with stars like SIRIUS I do, in this site I have a image of SIRIUS centered, but in the upper left area is a blue looks like a bowtie, if you can find it you will see the similar issue to your image, also tried to off center image but still the same.

Comment by Philip A Cruden on January 18, 2015 at 7:49am

Thanks Marc. Your issue with the reflections sounds a bit more complicated than mine so I wish you luck with sorting it out. I at least know it is for sure the focal reducer. It is always coming from the same place. In other words if I rotate the camera the reflections rotate with it. On this session with the Orion Nebula I moved the image around. On one of the images I moved the one above screen left and the reflection got smaller but much brighter and appeared to be coming from one of the brightest stars in front of the nebula so I can only assume that star is what is causing the reflections. Sorry for the long winded story. All the best, Phil

Comment by Marc Basti on January 18, 2015 at 6:34am

Philip, nice pic(s). Been having similar problem w/reflections (fortunately mine are on the outside edges and can be cropped out). My job this year is to find the problem ie check filter wheel, swap pieces in and out, etc. They are a pain for sure. Marc