Solar Photography
A few months ago I wrote a short article on astrophotography with camera lenses. Part of that article described what's required for solar photography. If you have a very dark ND filter, now is a good time to photograph the sun since there's currently (5/12/12) a fairly large sunspot group on display. We're approaching a peak in solar activity, so thought this year we should be seeing significant sunspot activity. If you're interested in doing solar photography a good solar filter will only cost you around $50 (see the link at the end of this article). First here's a shot I took using a handheld Tamron 70-300/4-5.6 VC USD lens with a solar filter attached:
.jpg)
Canon EOS 7D, Tamron 70-300/4-5.6 VC USD At 300mm, 1/3200s @ f16. ISO 100 through solar filter
Shot on 05/11/2012
Even with a very dense solar filter, the exposure was still very short. Don't even attempt this without a filter designed for solar photography. If the sun is very low in the sky (sunset) you might be able to get away with something like a Hoya NXx400 filter, but that filter is not dense enough if the sun is high in the sky.
Here's a closeup of the main sunspot group taken with a 500mm lens and 2x TC (effectively a 1000mm lens)
Canon EOS 7D, Canon 500/4.5L + Canon 2x TC, 1/100s @f10, ISO 200. Shot through visual solar filter.
Shot on 05/12/2012
For more information on what type of filters are required, please see my previous article on solar photography, http://www.bobatkins.com/photography/tutorials/astrophotography2.html
There's a link there to Thousand Oaks who sell screw in solar filters for camera lenses from 37mm to 82mm for around $50. You can also checkout solar filters at Orion Telescopes, though they mostly stock telescope rather than camera lens filters.
You can also buy inexpensive solar filters via Amazon. Here are a couple of examples. They won't screw into your lens, but will fit over it or in a DIY built holder. These are safe for visual use.
Final Caution - Don't try solar photography on the full sun unless you have a proper solar filter over the FRONT of the lens.. You could damage your eye, your lens and your camera.
