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Old 30th of January 2012 (Mon)   #1
omarsultan
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Default Shooting the Annular Eclipse

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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Old 31st of January 2012 (Tue)   #2
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Default Re: Shooting the Annular Eclipse

Quote:
Originally Posted by omarsultan View Post
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.
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Old 31st of January 2012 (Tue)   #3
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Default Re: Shooting the Annular Eclipse

Thanks! ( Again )
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