m101

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Comment by Kevin Galka on March 10, 2011 at 2:33pm

Ahhh Frederico.... you speak better english than some people I've grown up!!! :)

Comment by Federico Luciani on March 10, 2011 at 1:16pm

Thank you guys for your advices and words. My comments on the Jules' lesson wanted to be - I admit it, Jules, do not get mad - a bit 'ironic, but my English is not good enough for these purposes ... and the irony is not the strong point of Google Translate :-)

Comment by Kevin Galka on March 10, 2011 at 12:40pm

Hi Federico,
I can say you don't need to stack 100 to 200 images to get a great image... sure it can help but it deffinitely isn't the rule of thumb. Remember that when stacking digital images, for the most part 5 two minutes exposures is going to give the same signal to noise ratio as a single 10 minute exposure... its very different that film days (Take a look at my M31 picture in my photos section... it's 33 30sec subs stacked). 200 images at say 5 minutes apiece is over 15hrs of exposure... not necessary with todays ccds and dslr's. Getting faint detail in light polluted areas is very hard, if not impossible... and you did a great job here :) I know it's not always possible but the best images are from dark sites. .

Comment by Marc Basti on March 10, 2011 at 12:35pm

Federico, I agree w/you it's a decent (more not less) 101. It always helps to put more time to it ( I don't know about 33hrs, maybe 3-4 hrs worth). That's good you can get 5mn exposures w/your light pollution. I don't think you'll get much w/the 6nmH filter (not sure HIII ?) but a good broadband filter might help. Looks Cool Marc

Comment by Federico Luciani on March 10, 2011 at 10:41am

Wow, Jules, when you want to explain, you don't spare words. Thank you.
What seems a little bit unreasonable is to stack 200-10-minutes-subs, you know, it's about 33 hours; and nights - if you aren't in North Pole, are a little shorter; a note: 1 or 2 dark frames would add noise instead of reducing it.
Further, it seems a bit opinative that a DSLR (unfortunately I do not own a "Pro") would be able to withstand 10 minutes of exposure without sending the noise to the stars ... literally. Finally, 10 minutes subs require a perfect pole alignement, with a very good EQ mount.
Apart this four small points, thank you for your exhaustive lesson.

Comment by Federico Luciani on March 10, 2011 at 12:41am

To be honest, no. I got an astrodon 6nm HIII clip-on, but I never used it since i'm just starting, nice weather nights are so rare here...and I don't know if it could help me in enhancing contrast for this particular subject.

Comment by Kevin Galka on March 8, 2011 at 6:24pm

Try making a new thread in the Reprocess my Image section (click Start Discussion just above the comment window) and try posting it there. That section has a higher limit for file size (if there is even one there).

Comment by Federico Luciani on March 8, 2011 at 4:37pm

I've tried to post the tiff but it seems too large. The site gives me an error....

Comment by Kevin Galka on March 8, 2011 at 12:52pm

Noel's to flatten the background, curves and levels to stretch the data and highpass filter to try and bring out the detail in the arms. If you haven't yet, join the "Reprocess my Image" group and post the tif image there. I'd like to see what I could do with it.

Comment by Federico Luciani on March 8, 2011 at 11:16am

oh yess I'll give you a 16bit tif to play again! Noel Carboni's tools or what?

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