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Sunspot 2738 by projection


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About this observation
Dr Alan B Thomas
Time of observation
09/04/2019 - 13:49
Sunspot 2738
Observing location
My home in Cheshire
200mm Dob stopped to 50mm
32mm Plossl
Sony DSC-RX100
Projection screen
ISO 125, f/5.6, 1/500 sec.

After a seemingly long period of solar sunspot inactivity, I noticed via SolarHam that sunspot 2738 is visible and managed to obtain this image.

I'm sure that it must be possible to obtain higher-quality images using projection; one difficulty is not being able to precisely align the camera with the projection surface (a problem which does not occur with the back-projection solar funnel) although this does not seem apparent in the image I obtained today. But there are other issues . . .

I am contemplating building a projection box as described by Bob Oseman in his article 'A Cardboard Solar Projection Box' to see if this yields better images.  However, I have a variety of 'technical' queries about solar projection which I could perhaps best pose via a Forum post.

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