Close up on my m27...

[JohnP]

Been playing with my image of m27 again - I resized up & then sharpened a little using 'High Pass Filter technique - Aim was to see how much of outer neb I could show. also monochrome for comparison. I know it's probably overdone & noise is showing through & also guiding errors more evident but not bad for a £250 camera. Pretty pleased...

John

[Fay]

John, there are eruptions all over the place on the mono one. Lots of detail

Fay

[Mike]

Great detail John. Really nice.

[MarkS]

John,

Your results are very interesting.   

Your 15x5min Ha is clearly showing the jets.  However, I'm sure I couldn't see the slightest hint of jets on my 18x5min with the modified Canon (but I will go back and see just what I can tease out of my image).

As far as I can see there are 2 main differences that could explain this:
1) Quantum efficiency:  You are receiving more signal because more photons are converted to electrons.
2) Thermal noise.  You have a cooled camera so your Ha signal rises above the much lower noise level.

Mark

[Fay]

Could have compared my M27 with yours, John,  & Mark's but I only did 7x300secs. Half of what you both did.

[JohnP]

Hi Mark - Yep I think Chip in the atik 16ic has very good quantum efficiency - cooling obviously helps. What about focal ratio I was imaging at F6 with my MN56 (5-inch aperture)...

John

PS - I might do a few test subs at DSC so see what difference dark skies bring. Incidentally I took no darks with this image (only flats)