Dumbbell Nebula in O-III

[riklaunim]

SCT 8, reduktor f/6.3, Castell O-III, DSI III Pro - bin 2, guiding: Radial Guider/DMK/PHD and lame mount alignment

CCD temperature: 27C, darks, no flats

16 x 60 sec + 3 x 120 sec:

16 x 60 sec:

40 x 15 sec:

[Grzegorz Czernecki]

Great photo's ,Piotrek, gratulation (;

[Coco]

very nice...

Meade Pro III? there's a lot on the web about cooling these

Cheers

Guy

[riklaunim]

I have a simple fan that could be attached but didn't put it for this imaging (first attempts with new setup and guiding). I've seen some peltier mods but this is a bit of irreversible work on the housing etc. Darks will do, and in autumn nighs will be chilly, and in winter it should hit -20C :] free "cooling"

[riklaunim]

Stack on two starts to remove the slight rotation:

And 2x bigger version made by drizzle stacking

[Moonshane]

a bit off topic but how do you find the castell filter? I am thinking of getting one for visual only and with the 12" dob mainly. I live between Stockport and Manchester so LP is an issue but I do look mainly east so it's as good as it can be from my house.

[johnh]

M27 ears seem to show pretty well.

John.

[riklaunim]

a bit off topic but how do you find the castell filter? I am thinking of getting one for visual only and with the 12" dob mainly. I live between Stockport and Manchester so LP is an issue but I do look mainly east so it's as good as it can be from my house.

You have 12" so I think you can use more narrow Baader in it. Castell is broader and lets more non O-III light in. It doesn't cut all the stars and background (some like that), but also contrast gain is lower.

Red - Baader, Black - Castell. Other comparison on Astrotreff-Deep-Sky - Astrofilter Spektren im Vergleich

[Moonshane]

cheers for that - I went for the Castell today. whatever it shows will be an improvement on a number of targets than with no filter I s'pose.