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Photo Forum / Digital Photography / DSLR Cameras / June 2006Photographing the Sun
No, not madness. Last week I was pointed in the direction of Baader AstroSolar Safety film. Some details at <http://www.baader-planetarium.com/sofifolie/sofi_start_e.htm> I managed to get this image using safety film on an EOS 350D with a 70-210 Sigma zoom at 210, F5.6, 1/800th: http://www.flickr.com/photos/75234631@N00/173742103/ It seems there's not much going in in Sunspot land, but there is some limb darkening going on. I thought it may be of interest, particularly to those of you with something with a longer focal length who are interested in something a little scientific - at 210, the disk is still too small for my liking. Andy > No, not madness. > [quoted text clipped - 15 lines] > > Andy This was shot through a 1000mm f8 lens using Baader film and then recoloured. Olympus E-1 so the lens "functioned" like a 2000mm. http://www.pbase.com/andersonrm/image/59325239 >> No, not madness. >> [quoted text clipped - 20 lines] > Olympus E-1 so the lens "functioned" like a 2000mm. > http://www.pbase.com/andersonrm/image/59325239 Nice. Did you need to crop or was that the actual image?  SignatureAndy > No, not madness. > [quoted text clipped - 15 lines] > > Andy As you go up in focal length (magnification) film may limit resolution, so a glass filter is needed with high optical quality. This was taken with a 500 mm f/4 telephoto + 1.4x TC + a Celestron 5-inch diameter glass solar filter. If I remember correctly, the filter cost about $75. http://www.clarkvision.com/galleries/gallery.astrophoto-1/web/sun.c11.19.2003.v1 .4-800b.html Roger >> No, not madness. >> [quoted text clipped - 23 lines] > > http://www.clarkvision.com/galleries/gallery.astrophoto-1/web/sun.c11.19.2003.v1 .4-800b.html Nice. Do you have any objections to me passing this link onto some fellow students/tutors? -- Andy >> http://www.clarkvision.com/galleries/gallery.astrophoto-1/web/sun.c11.19.2003.v1 .4-800b.html >> > Nice. Do you have any objections to me passing this link onto some > fellow students/tutors? Sure, that would be fine. There is a lot more stuff if you start from the home page. Roger > No, not madness. > [quoted text clipped - 9 lines] > It seems there's not much going in in Sunspot land, but there is some > limb darkening going on. Why is it Lavender? >> No, not madness. >> [quoted text clipped - 11 lines] > > Why is it Lavender? I suspect that's a feature of the absorption spectrum of the filter. I'd prefer to describe it as violet though. SignatureAndy >>> No, not madness. >>> [quoted text clipped - 13 lines] > >I suspect that's a feature of the absorption spectrum of the filter. >I'd prefer to describe it as violet though. That also happens when there is a high ratio of NIR to visible light. Neutral density filters tend to pass NIR, so strong ND filters should result in purple casts with high-NIR sources. Signature<>>< ><<> ><<> <>>< ><<> <>>< <>>< ><<> John P Sheehy <JPS@no.komm> ><<> <>>< <>>< ><<> <>>< ><<> ><<> <>>< > No, not madness. > [quoted text clipped - 15 lines] > > Andy Yes - the sun is fun. Eclipsing: http://faxmentis.org/html/science35.html Partially eclipsing: http://faxmentis.org/html/eclipse03a.html With Mercury transiting: http://faxmentis.org/html/science36.html With Venus transiting: http://faxmentis.org/html/transit3.html The last one compares the colour rendition of 1000 Oaks and Baader solar films. Please excuse lack of dSLR content. To get back OT for the group: Earthshine on the Moon: http://faxmentis.org/html/earthshine.html (Pentax *1stDS + 600mm f/8 cat.) -- Jeff R. >> No, not madness. >> [quoted text clipped - 17 lines] > > Yes - the sun is fun. Isn't it just. I was quite surprised at what could be done just with the addition of some film. > Eclipsing: http://faxmentis.org/html/science35.html > Partially eclipsing: http://faxmentis.org/html/eclipse03a.html Nice. > With Mercury transiting: http://faxmentis.org/html/science36.html Very nice. > With Venus transiting: http://faxmentis.org/html/transit3.html Even nicer. > The last one compares the colour rendition of 1000 Oaks and Baader solar > films. > > Please excuse lack of dSLR content. To get back OT for the group: > Earthshine on the Moon: http://faxmentis.org/html/earthshine.html (Pentax > *1stDS + 600mm f/8 cat.) Thanks. It looks like I have some work to do to catch up :) SignatureAndy |
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