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Photographing the Sun



 
 
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  #1  
Old June 25th 06, 08:45 PM posted to rec.photo.digital.slr-systems
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Default Photographing 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
  #2  
Old June 26th 06, 04:58 AM posted to rec.photo.digital.slr-systems
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Default Photographing the Sun

Andy Mulhearn wrote:

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


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...v1.4-800b.html

Roger
  #3  
Old June 26th 06, 05:35 AM posted to rec.photo.digital.slr-systems
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Posts: n/a
Default Photographing the Sun

Andy Mulhearn wrote:

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.


Why is it Lavender?
  #4  
Old June 26th 06, 09:39 AM posted to rec.photo.digital.slr-systems
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Posts: n/a
Default Photographing the Sun


"Andy Mulhearn" wrote in message
...
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


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.




  #5  
Old June 27th 06, 06:50 PM posted to rec.photo.digital.slr-systems
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Default Photographing the Sun

RichA wrote:
Andy Mulhearn wrote:
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


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


Nice. Did you need to crop or was that the actual image?

--

Andy
  #6  
Old June 27th 06, 06:53 PM posted to rec.photo.digital.slr-systems
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Default Photographing the Sun

Roger N. Clark (change username to rnclark) wrote:
Andy Mulhearn wrote:

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


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...v1.4-800b.html


Nice. Do you have any objections to me passing this link onto some
fellow students/tutors?

--

Andy
  #7  
Old June 27th 06, 06:53 PM posted to rec.photo.digital.slr-systems
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Posts: n/a
Default Photographing the Sun

Brion K. Lienhart wrote:
Andy Mulhearn wrote:

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.


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.

--

Andy
  #8  
Old June 27th 06, 07:00 PM posted to rec.photo.digital.slr-systems
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Posts: n/a
Default Photographing the Sun

Jeff R. wrote:
"Andy Mulhearn" wrote in message
...
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


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

--

Andy
  #9  
Old June 27th 06, 10:32 PM posted to rec.photo.digital.slr-systems
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Posts: n/a
Default Photographing the Sun

In message ,
Andy Mulhearn wrote:

Brion K. Lienhart wrote:
Andy Mulhearn wrote:

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.


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.


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.
--


John P Sheehy

  #10  
Old June 28th 06, 01:44 AM posted to rec.photo.digital.slr-systems
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Posts: n/a
Default Photographing the Sun

Andy Mulhearn wrote:

http://www.clarkvision.com/galleries...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
 




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