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GlassWalker

Sun 20-8-2012 Ha + prominences

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Today's sun... all images are 100% crops from DMK41. Best 10% of 1000+ frames.

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Thought I'd have a go at the prominences close up. Far from easy... since I don't have any workable barlows at the moment, I decided to use eyepiece projection with a Hyperion to T-mount to DSLR to C-mount... this was my first capture of the prominences around 4 o'clock of the disc. I blew the surface here...

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Here I moved over to the prominences around 8 o'clock of the disc. I fiddled a bit more with the video settings and managed to get both prominences and surface detail at the same time.

Side note: I find when I stick more glass in the chain, I can get a diagonal stripe appearing near the centre of the image. It seems to be due to the optical chain, but I'm at a loss as to what causes it, or what could be done to eliminate it.

Now I'm wondering if I can get better detail out of a regular PST (single stack), or would there be better gains from going DS or a stage 1 mod to bigger aperture scope...

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Hi,

Does your DMK41 come in to focus with a barlow? Did you need to modify your PST eyepiece holder?

I think your lines are due to diffraction between the filter in the PST and the glass. I seem to get them when using colour cameras (Bayer Matrix) on my PST, but they disappear on a DMK with no glass in the way.

It might be the coatings on your Hyperion which is causing the problem.

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My DMK can't reach focus on the PST even with the short shoulder less nose piece without modification. Previously I have used a barlow element, but the 1st pic above was done by shaving the eyepiece holder. Two close up shots were via eyepiece projection.

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