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Equipment Discussions >> ATM, Optics and DIY Forum

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CosmoJoe
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Reged: 10/03/12

Loc: Gilbert, Arizona
Idea for a solar aperture stop new
      #5552474 - 12/03/12 05:35 PM Attachment (29 downloads)

I have a couple ideas for an aperture stop solar filter that might have all the benefits of a small aperture and a full aperture. It basically would use four small aperture stops inbetween each spider. Take a look at my drawing and let me know what you think.

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CosmoJoe
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Reged: 10/03/12

Loc: Gilbert, Arizona
Re: Idea for a solar aperture stop new [Re: CosmoJoe]
      #5552519 - 12/03/12 06:08 PM Attachment (17 downloads)

This is my other idea but the spider would be in the way. and of course the astrosolar film will be in the fstop holes

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StarStuff1
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Reged: 04/01/07

Loc: South of the Mason-Dixon Line
Re: Idea for a solar aperture stop [Re: CosmoJoe]
      #5552603 - 12/03/12 06:58 PM Attachment (11 downloads)

Your first photo looks eerily similar to a multiple aperture mask I made nearly 10 years ago. But I only used mine on a bright Moon and planets. It dims the image a little on my 8-in f/6 but takes away some irradiance so the image is "steadier", especially with turbulent air. So you cannot not see more details than without a mask but the steadier image is more pleasant. Of course, several notables here will tell you that the diffraction effects will do harm more than help but I do not find that to be the case. I'm no optician but aren't there some large professional scopes (Keck ?) that use segmented mirrors? Seems like diffration effects there would be horrendous.

Anyway, it is a quick, cheap and easy project and I don't see why it shouldn't work on solar. If the seeing is really bad you can cover up one or more aperture openings until it gets just right.

You might want to consider a light color so the mask isn't superheated by the Sun.

Go for it and report back!


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