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Today and tomorrow (5/11 and 5/12) an extremely large group of

  1. May 11, 2012 #1

    Andy Resnick

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    Today and tomorrow (5/11 and 5/12) an extremely large group of sunspots is directly facing the earth:

    http://abcnews.go.com/blogs/technology/2012/05/enormous-sunspot-could-lead-to-solar-flares/

    I went outside this morning and using a ND 7.0 filter could see it by eye, so photographs could be quite spectacular. Note- if you are not sure what 'ND 7.0' means, then don't risk damaging your eye and/or camera.

    Notes: when I photograph the sun, I use at least ND 5.0, no polarizers, but keep the UV filter. The order matters- the UV filter goes at the back end, after the ND filters, to prevent damage. The ND filters have been absorptive, but I just found a reflective one buried in one of the labs which I'll try today. Even at ND 5.0 I have to stop down to f/44 (f/22 + 2X tele) and expose at 1/8000 s. If I want to add a color filter, that goes last, after everything else.

    Good luck!
     
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  3. May 11, 2012 #2

    jtbell

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    Re: Sunspots

    Are you going to try for the transit of Venus on June 5?
     
  4. May 11, 2012 #3

    Andy Resnick

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    Re: Sunspots

    Definitely! It will be visible here around sunset... I've been getting dizzy converting universal time to local time.
     
  5. May 11, 2012 #4

    Andy Resnick

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    Re: Sunspots

    Whoa:

    http://img217.imageshack.us/img217/4374/dsc44051.jpg [Broken]

    http://img98.imageshack.us/img98/3820/dsc440521.jpg [Broken]
     
    Last edited by a moderator: May 6, 2017
  6. May 13, 2012 #5

    Drakkith

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    Re: Sunspots

    That thing must be at least twice the size of the Earth. Or even a dozen!
     
  7. May 13, 2012 #6
    Re: Sunspots

    So I drove to the sea for the sunset and see if I could capture it.

    Bummer, the sun hid behind frontal system clouds coming in, before it was dim enough to lock on.

    I guess I need that seven stops neutral density filter (ND7).
     
  8. Jun 5, 2012 #7

    Andy Resnick

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    Re: Sunspots

    I guess Venus counts as a 'sunspot' tonight- most likely I'll never find out as the clouds are heavy and getting heavier.... :(
     
  9. Jun 5, 2012 #8

    Andy Resnick

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    Re: Sunspots

    The skies miraculously cleared up right at 6:03 pm. Here's a sample:

    http://img812.imageshack.us/img812/908/dsc009811.jpg [Broken]

    My lens is *filthy*- aside from all the sunspots....
     
    Last edited by a moderator: May 6, 2017
  10. Jun 5, 2012 #9

    Astronuc

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    Re: Sunspots

    Nevertheless, nice!
     
  11. Jun 5, 2012 #10

    Drakkith

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    Re: Sunspots

    Nice Andy!
     
  12. Jun 5, 2012 #11

    jtbell

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    Re: Sunspots

    Beautiful! Much better than the crude pictures that I produced by using a pair of binoculars as a "projector" and photographing the resulting image on a screen.
     
  13. Jun 6, 2012 #12

    Andy Resnick

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    Re: Sunspots

    Here's a few more, after some post-processing:

    http://img826.imageshack.us/img826/306/montagesmall.jpg [Broken]

    and a close-up just as Venus makes 'second contact'- supposedly it's possible to see Venus's atmosphere, but I'm not sure I can:

    http://img690.imageshack.us/img690/151/kisska.jpg [Broken]

    And then a cleaned-up version of the one I posted earlier: I stacked about 40 frames to get rid of the dirt, then added Venus later. One bonus- the solar atmosphere along the limb is visible (at the bottom):

    http://img819.imageshack.us/img819/4420/tweaksmalll.jpg [Broken]
     
    Last edited by a moderator: May 6, 2017
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