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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 06 Jul 2011 (Wednesday) 11:41
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M51 at 400mm

 
archer1960
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Jul 09, 2011 10:22 |  #16

No dark frames in this set. I brain-farted and forgot to get darks and flats.


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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martyn_bannister
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Jul 09, 2011 10:53 |  #17

archer1960 wrote in post #12729649 (external link)
No dark frames in this set. I brain-farted and forgot to get darks and flats.

I feel your pain! My usual screw up is to shoot the whole night in JPG rather than RAW :)

The good thing is that you can get flats anytime (assuming you still have the lens) and darks (as long as you can repeat roughly the same temperature).




  
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archer1960
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Jul 09, 2011 11:11 |  #18

martyn_bannister wrote in post #12729786 (external link)
I feel your pain! My usual screw up is to shoot the whole night in JPG rather than RAW :)

The good thing is that you can get flats anytime (assuming you still have the lens) and darks (as long as you can repeat roughly the same temperature).

I've done that (shoot in .jpg all night) too! Yes, I'm hoping to get my darks and flats tonight, schedule permitting.


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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Toxic ­ Coolaid
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Jul 09, 2011 13:45 |  #19

Flats also make a big difference. I usually use 10 Flats, 10 darks, and 10 bias/offset. Every little bit you do helps. If you leave 7-10 seconds between your shots it will let your sensor cool down and eliminate some noise. A good way to see how the noise increases from heat in time is to leave your lens cap on and take (5) 5 minute exposures at 800 ISO. Look at the images to see how the 'hot pix' keep getting brighter. Of course, the higher the ISO you use, the more noise you'll see.




  
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naddieuk
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Jul 10, 2011 03:22 |  #20

That is a pretty good capture of m51. :-)


Canon Powershot S95, Canon EOS 1000D attached to Skywatcher Explorer 150P on an EQ-3 unguided mount.
My Flickr site. (external link)

  
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Jul 29, 2011 09:58 |  #21

Awesome! Inspiring




  
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Laserlight
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Jul 29, 2011 11:18 |  #22

Can M51 be seen through a 10" Dob... Have had the worst luck in locating this.


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archer1960
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Jul 29, 2011 11:52 |  #23

Laserlight wrote in post #12843255 (external link)
Can M51 be seen through a 10" Dob... Have had the worst luck in locating this.

Yes, it can. We see it regularly at the observatory I visit in a 10" dobs. It's rather faint, but on a good night, you can see a hint of spiral structure. You won't see it if there's much of a moon, but near the new moon you can if your skies are fairly dark. For me the hardest part is that this time of year it's so high that it's tough aiming and maneuvering a dobs to it until later in the night when it starts getting lower in the west.


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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M51 at 400mm
FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
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