My PST CaK mod.

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marktownley
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Re: My PST CaK mod.

Post by marktownley »

Thanks guys, i hope it is 'just' a reflection off the back of the objective. I'll have a try this afternoon with the linear polariser if the storms stay away and the skies remain blue...


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Re: My PST CaK mod.

Post by Bob Yoesle »

Following up on some experiments:

I tried the photographic circular polarizer (reversed on the near side of the SkyBender tilt plate) between the two PST no. 1 filters without success. An interesting finding was that reversing the Baader CaK filter greatly improved the separation of the major reflections, some of which are seen in Mark's videos on the preceding page. Alas however, the smearing reflection that overlies the primary image was still there.
R_194104 LR Decon JPG sm SM.jpg
R_194104 LR Decon JPG sm SM.jpg (375.11 KiB) Viewed 2503 times
R_194104 LR Decon adj sm.jpg
R_194104 LR Decon adj sm.jpg (285.57 KiB) Viewed 2503 times
21/08/14 @ 19:41 UTC

I also noticed only the first filter of the Baader CaK is tilted, the second one is normal to the optical axis. I'm beginning to think the best solution is the obvious one -- needing to tilt every component slightly ~ 1/2 to 3/4 a degree to minimize the reflections without shifting the filter passbands too much...

Bob


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Re: My PST CaK mod.

Post by swisswalter »

Hi Bob

thanks for sharing that information


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Re: My PST CaK mod.

Post by marktownley »

I've got a lot I need to add to this thread, I will be doing a big addition to it soon...


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