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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 16 Jul 2011 (Saturday) 11:05
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M101 at 400mm

 
archer1960
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Jul 16, 2011 11:05 |  #1

Continuing the theme of M* at 400mm, here is M101 from last weekend. Shot with a T1i (500D), a Canon 400mm f/5.6L lens on a clock-drive (non-guided) mount. I fed DSS with 40x30sec subs, of which I believe it kept 35 or 36, so ~17-18 min of total exposure time. Darks, Flats, and Dark Flats were also applied, but no bias. Final processing for levels and contrast done in Canon DPP. As you can see in the crop, my polar alignment wasn't as good as I had when I was doing M51 a couple of weeks ago.

C&C appreciated!

P.S. Does anybody know what that blob about 10:00 from M101 is? Neither of the astronomers at the place I go knew off the top of their heads.

This is the full stacked frame.

IMAGE: http://www.davidkerber.com/picposts/AstronomyAndSpace/M101-fullframe.JPG

And this is the cropped version that I'm calling my "Final".
IMAGE: http://www.davidkerber.com/picposts/AstronomyAndSpace/M101.JPG

Gripped 7D, gripped, full-spectrum modfied T1i (500D), SX50HS, A2E film body, Tamzooka (150-600), Tamron 90mm/2.8 VC (ver 2), Tamron 18-270 VC, Canon FD 100 f/4.0 macro, Canon 24-105 f/4L,Canon EF 200 f/2.8LII, Canon 85 f/1.8, Tamron Adaptall 2 90mmf/2.5 Macro, Tokina 11-16, Canon EX-430 flash, Vivitar DF-383 flash, Astro-Tech AT6RC and Celestron NexStar 102 GT telescopes, various other semi-crappy manual lenses and stuff.

  
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spit
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Location: Alpha Cygnus II- Delta Quadrant
     
Jul 16, 2011 13:59 |  #2

the blob is ngc5474, for 30 second exposures, id be more concerned about polar alignment then darks and flats, the trailing is too evident for 30 sec/subs, nice attemt on M101




  
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MJTSUB
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Jul 16, 2011 14:09 as a reply to  @ spit's post |  #3

NIce!




  
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Tweet
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Jul 29, 2011 09:58 |  #4

Great Stuff! That clock drive is a wonder to me!




  
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M101 at 400mm
FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
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x 1600
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