Hello all,
Clear skies last night, so I decided to test various configurations to try and lose the reflections obtained on the M42 image posted previously...
http://www.iceinspace.com.au/forum/a...e.php?a=105044
Reflections in the test images aren't as marked as those in the above link but are there - look just above the Running Man Nebula.
Imaging train configurations detailed below (no LPS filter used)
From L to R:
Image 1 - Baader 7.5mm Spacer > Camera Adapter > AP 0.67x Reducer
Image 2 - Camera Adapter > AP 0.67x Reducer
Image 3 - No Reducer
Image 1's thumbnail shows obvious vignetting with the spacer/reducer combo and strange little reflection above the running man's head.
With the Baader spacer removed in Image 2, the vignetting is reduced and running man's halo is gone - promising!? Still looks like there's a thin reflection on the right hand side though.
Image 3 with no reducer (FL=1624mm) has no reflections but image is soft - ? collimation issue.
Comments/ Advice appreciated
Cheers
Doug