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M13 - 24 May 2011

Started by MarkS, May 26, 2011, 00:48:29

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MarkS

M13 from last night - a very quick pre-process - complete with satellite trails.

Modified Canon 350D on Tak Epsilon 180ED with IR/UV filter.
30 x 5min at ISO 800
10 x 150sec at ISO 100



Full version is here:  http://www.markshelley.co.uk/Astronomy/2011/m13_24052011_full.jpg
I fell asleep during acquisition and forgot to refocus with the falling ambient temperature - hence the squiffy stars on the right hand side of the full image.

Mark

Rocket Pooch


JohnP

That is looking good again Mark & great colours as well. Ton's of background fuzzies as well... Can't believe you have so many satellite trails....?

John

RobertM

That's a really impressive result Mark.  I love the star colours.

The Thing

Fantastic. Shows how important the scope is. No substitute for good optics.

MarkS

Quote from: The Thing
Fantastic. Shows how important the scope is. No substitute for good optics.

Indeed, for full colour imaging you can't beat fast optics and dark skies.

mickw

Great image but why are you getting 6 point spikes at the bottom of the large version ?

Growing Old is mandatory - Growing Up is optional

MarkS

Quote from: mickw
Great image but why are you getting 6 point spikes at the bottom of the large version ?

When the DSLR mirror folds away during the exposure, it still sticks out far enough to interrupt the lightpath to that part of the CCD at a fast F-ratio of F2.8

A straight edge interrupting a lightpath causes a diffraction spike at right angles to the straight edge.

The Thing

Fold it away - permanently :twisted:

mickw

That's a bummer, only affects the bottom though luckily  :-?
Growing Old is mandatory - Growing Up is optional

Mac


MarkS


I have thought about removing the mirror entirely but I don't know of anyone who has tried it and I don't want to risk any unintended consequences.

PhilB

I'd have to rate this image as the best M13 I can remember seeing!
"Never worry about theory as long as the machinery does what it's supposed to do."  Robert A. Heinlein

Carole

Amazing resolution, love those star colours.

Carole

Fay

that really is great Mark!!!!!!
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!