Solar Filters and Camera

  • Thread starter Dagenais
  • Start date
270
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I have been thinking about picking-up two things for my telescope. A camera adapter and solar filter.

How much does a good solar filter usually cost (one that I can buy at a store, not on the internet)? Where can I purchase one? I also hear that one should never buy one that goes over the eyepiece, but over the front of the telescope instead.

How much does an adapter cost to connect a digital camera to a telescope?
 
173
0
I never trust the filters
but to look at sunspots I just project the image on a sheet of paper
even with a very small scope you can get a large image that way and it is both totaly safe and free
just hold a sheet of paper about 1 to 3 feet away and move it intill you get a sharpe image
 
270
3
Project from my telescope? Won't this destroy the inside?
 
173
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Originally posted by kenikov
Project from my telescope? Won't this destroy the inside?
NO it will not unless you have a plastic lenz or mirror and will protect your eyes from uv-rays

you can also use a cheap pair of bi-knocks
and get a large immage that severial people can see at once with nice sharp sun spots by projecting on paper
 

Labguy

Science Advisor
729
7
Originally posted by ray b
NO it will not unless you have a plastic lenz or mirror and will protect your eyes from uv-rays

you can also use a cheap pair of bi-knocks
and get a large immage that severial people can see at once with nice sharp sun spots by projecting on paper
Very many high-cost eyepieces have been ruined by "solar projection". Even in the good glass, some elements in some designs are cemented (glued), and the heat from the objective can destroy the cement and/or break the glass.

A full-aperture solar filter is safe if reasonably well made. Two US companies make glass filters of different sizes, but most people now use the "film" filter material from Baader, in Germany. It gives higher resolution, and it even comes with instructions on how to make a filter cell from a few $ worth of glue and paper. Very safe and very high resolution.
 

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