With my fairly modest optical means, I am chasing
faint deep-sky objects through an atmosphere full of
bad smog and dust against an
ugly skyglow from uncounted street lamps, railway stations, posters, illuminated shops and more.
My setup for the images below: Tamron Adaptall-2 SP 350mm f/5.6 mirror lens (Model 06B) on Pentax K-5 with Pentax O-GPS1 and Wallimex right angle finder. Finderscope made of Tamron Adaptall-2 80-210mm f/3.8-4 (Model 103A) and Tamron Teleview Wide-field adpater.
Does this make sense? Perhaps not really, but for me, this is the kind of sky that I usually have and I find it a fun challenge to combat light pollution and noise and bring out as much of these elusive smudges of light as I can.
First an unprocessed JPEG straight out of the camera to show the kind of sky I have to deal with.
Pleiades: 15s exposure at ISO3200 and f/5.6 (fixed aperture mirror lens).
Obviously stacking including flat-frame subtraction is a must:
Stack (mosaic) of 28 images in Deep Sky Stacker; all taken at 15s and f/5.6 but with different ISO values of 1600, 3200 and 6400.
Is there or isn't there a faint indication of the reflexion nebulae floating in-between the stars?
Crop of the above image contrast in PhotoImpact using curves and levels.
Yes, I did capture a bit of the nebulae. It's a far cry from the true beauty revealed by long exposures but this is my very own "discovery". And while we are in Taurus, let's procced to this one:
Stack(mosaic) of 10 images taken at 15s, f/5.6 and ISO 3200 of star Zeara Tauri and surroundings, showing the supernova remnant, Messier 1, the Crab Nebula on top near the middle of image.
A crop of this image shows M1 better:
And the relatively large surface brightness of M1 allows for some more agressive contrast enhancement - and noise reduction! - in PhtoImpact:
100% crop of the original stack, 700 pixels wide, shows the elongated shape of M1, which is 11 light years long and seen at a distance of some 6,000 light years.
(Click on Images 2 - 6 to see larger versions - 1280 pixels wide)
So, is it worth the effort? For me, it is. I gives me a kind of thrill of discovery even though these images are not exactly text book worthy. But I do sometimes wish one could buy a darker sky as easily as one can buy yet anothe piece of gear......
Last edited by Stone G.; 11-26-2012 at 04:43 PM.