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FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
Thread started 30 Jan 2012 (Monday) 13:27
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Shooting the Annular Eclipse

 
omarsultan
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Jan 30, 2012 13:27 |  #1

I was intrigued by the article on the coming annular eclipse in the Feb '12 edition of Sky and Telescope since it will be in my neighborhood. So, two newbie questions:

  • Do I simply need a solar filter for my telescope--is there any particular kind of solar filter?
  • Any hints on exposure?


Thanks,

Omar

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Omar Sultan
Canon EOS 7D | EF-S 17-55mm f/2.8 | EF 70-200mm f/4L | EF 100mm f/2.8L | EF 1.4X III TC | Celestron EdgeHD 800

  
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hollis_f
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Jan 31, 2012 07:00 |  #2

omarsultan wrote in post #13795141 (external link)
I was intrigued by the article on the coming annular eclipse in the Feb '12 edition of Sky and Telescope since it will be in my neighborhood. So, two newbie questions:

Do I simply need a solar filter for my telescope--is there any particular kind of solar filter?
Any hints on exposure?


Thanks,

Omar

You want to make a filter from Baader AstroSolar Film to fit over the front of your 70-200 with the 1.4 attached. There's a guide here. Make sure the filter cannot be knocked from the lens by accident - use a lot of tape. Do not be tempted to use mylar, welding glass or ND filters. There's a good chance that they'll block the visible light but pass the IR. If you're lucky it'll just fry your sensor, if you're unlucky it'll fry your retina.

You really want a longer lens than the 70-200, even with a 1.4x. To fill the frame you'd need something like 1500mm on an APS-C, so 280mm will make for a small image.

For exposure - try it on the sun before the eclipse. About 1/400s; f8; ISO200 will be a good starting point.


Frank Hollis - Retired mass spectroscopist
Give a man a fish and he'll eat for a day. Teach a man to fish and he'll complain about the withdrawal of his free fish entitlement.
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omarsultan
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Jan 31, 2012 18:35 as a reply to  @ hollis_f's post |  #3

Thanks! ( Again :) )


_______________
Omar Sultan
Canon EOS 7D | EF-S 17-55mm f/2.8 | EF 70-200mm f/4L | EF 100mm f/2.8L | EF 1.4X III TC | Celestron EdgeHD 800

  
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Shooting the Annular Eclipse
FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
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