Experimenting with Omega Centauri Data (Now with Colour)
Just playing squeezing out more detail I added some old data from last year to the new subs of Omega Centauri giving 280 subs at 15 secs, the old subs were taken during approx 80% moon and were 48 degrees rotated to the new subs, when I stacked them the result image had so many colour gradient problems, green, purple and blue gradients to the sky and purple and green stars, it will take a while to fix the image so I converted it to greyscale being a lot easier to deal with for now. I will post the colour image when its problems are fixed.
This image seems ok for now and the Crop of the core shows a lot of detail for only 15sec subs.
I have been able to fix some of the star colour and gradient problems so I have added a cropped colour version from the same data, it still needs some work though.
Omega Centauri Globular Cluster NGC 5139
280 x 15 sec subs at iso 1600, darks and bias (70mins data)
12' LX200 (alt/az setup, no guiding)
Sony Nex-3 DSLR
Stacked in DSS
Processed in GIMP
Last edited by wayne anderson; 27-05-2013 at 02:09 PM.
Thanks, Bob, Rowland, Brent and Laurie. It really is amazing how stars are packed into this globular even through the eyepiece it has an unusual 3D effect with too many stars to count.
hi Wayne, Nice work again.
Is it just me that the top right hand stars appeared pear-shaped? some threads here discussed about non-perpendicular camera position or maybe stacking alignment error ?
Lovely anyway.
Cheers
David
Thanks everyone and thanks David you have given me something to think about non-perpendicular camera position, I always just put the slightly blobby and pear shaped stars down to the alt/az limitations, tracking error and stacking, every sub was taken in alt/az with no guiding and even at 15sec the subs have slightly curved stars and more so at the edge of the field. I will definitly look into the non-perpendicular camera position problem.
