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GlassWalker

Sun 06-10-2012 CaK

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DMK41, ST120, Baader CaK filter. No flats, 2 frame mosaic.

I had another go at the sun with CaK filter which I had limited success with previously. This time I tried using the SkyWatcher ST120 scope, and could improvise some ND5 solar film into the reduced aperture mask on the cap. This gave sharper output than I ever got before once I tilted it slightly to prevent internal reflections. I thought this was going too well, so I got the last scrap of solar film to make an almost full aperture filter... that was far lower contrast and I couldn't tell if the resolution was improved at all or not. I suspect there were too many internal reflections to manage without making a better filter holder that I used...

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