Dumbbell 4th July 2007

Here's another M27 taken on 4th July, (Happy Birthday Leanne).
This is a DSS combination of the previous set of images taken on the 01/07/08 and a set of 28 x 2minute 1600ISO images taken on the 4th. I polar aligned the scope before taking the images, and therefore I didn't use DEC control in PHD. But there was a very small amount of trailing that I could detect, which had to be removed in PS using layering. Because of this the results are not quite as good as I hoped (the stars look like squashed eggs).
Still you live and learn.
The two set of images were quite a bit out of registration, but DSS matched them up perfectly.


Removing star trails:-
Using PS in layers duplicate the image (called a background copy), next change the background copies blending mode to darken,
with background copy highlighted, select the offset tool in filters
Filters>Other>Offset
(zoom in 500% on the image "Ctrl +") and adjust the horizontal/vertical pixels
(undefined areas set to wrap around).
For the full size picture I used Horizontal of "1" and Vertical of "2"...this will vary depending on the size of the trails and what direction they are heading....i.e. up and down...on a 45....sideways.... etc. ....play with the two settings until the trails are diminished or eliminated....you can use negative numbers.
Once you have the star shape where you want it, zoom back out, then flatten the image and save.
If the filter takes it a tad too far, go to the ..... Edit>Fade filter function and this will decrease the amount. (this must be done before you flattern)....play with it a couple of times.
Credit FWHM IMAGING FORUMS

Dumbbell Nebula 1st July 2008

The image at the bottom is a single RAW frame that has been reduced in size and cropped.

Dumbbell capturing.

Here's a screen dump from one of my computer screens (running dual monitors you know, it's the only way to go with all these programs running at once).
This shows the PHD guiding window and graph, on the right is the DSLR shutter program.
The HC Buttons are a handy little scope controller that comes with PHD.

Question: Why that star on the left?
Answer: That's what you're supposed to do, pick a star off centre that isn't too bright. ;-)

M27 - Dumbbell Nebula - 29th June 2008

It's clear! panic stations, what do I do? what's around? the Dumbbell Nebula!
I didn't have enough subs, (because my corrector plate totally dewed over, I wondered why it was getting dark), but there is something there.
This is 12 frames, totalling 17mins 40s of exposure. No darks, flats or bias. Prime focus C9.25, guided with Push Here Dummy.
M27 is 1,250 Light years away.