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Transit of Mercury in the Spicule Layer. Phil took this great image with his Quantum 6 Scope, Solar Spectrum etalon and PGR Camera.

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Crazy Idea...?

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
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Bob Yoesle
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Crazy Idea...?

Post by Bob Yoesle » Sat Apr 06, 2019 3:04 pm

Removed.
Last edited by Bob Yoesle on Wed Apr 10, 2019 5:04 pm, edited 2 times in total.
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marktownley
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Re: Crazy Idea...?

Post by marktownley » Sat Apr 06, 2019 7:13 pm

The concept is sound.
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Bob Yoesle
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Re: Crazy Idea...?

Post by Bob Yoesle » Sat Apr 06, 2019 9:14 pm

Removed.
Last edited by Bob Yoesle on Wed Apr 10, 2019 5:05 pm, edited 1 time in total.
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Valery
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Re: Crazy Idea...?

Post by Valery » Mon Apr 08, 2019 12:43 am

I am quite pessimistic here. All these optical liquids have too high temperature dependance of their refractive indexes. Leackage problem is also not very easy to solve.
Temperature gradients within the etalon is a major problem as well. The TEC system must be much more precise than the systems which used now in DS and SS now.

If you need a wider sweet spot, it is easier to use a larger etalon or to use a telecentric system for air-spaced etalons. In the case of telecentric, if we will stay at F/50 and the etalon is narrow enough, then it will work. See the attached photos taken with Quark and anti-Quark. I can only add that the anti-Quark works better visually - an eye does not see non-uniformity accross the FOV like in PE or RG grade etalons, but Quark has a bit tighter bandwidth. The image scale is about 67% of original, telescope is C11 and both etalons worked at F/43.

If to use a selected air-spaced etalon larger than a typical amateur PST Mod, then sweet spot is wide enough for covering of such a sensor like IMX174 at F/20 at it.
When to tilt an etalon in such a scheme we will see that a round sweet spot transforms in a wide arc-like band. If to orient the camera frame x-axis along with the band, then we will prpbably not see this effect within a camera FOV.


Valery
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ANTI-QUARK VS QUARK CHORM 1.png
ANTI-QUARK VS QUARK CHORM 1.png (1.26 MiB) Viewed 504 times
Last edited by Valery on Mon Apr 08, 2019 8:32 pm, edited 2 times in total.
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Re: Crazy Idea...?

Post by Merlin66 » Mon Apr 08, 2019 6:54 am

Bob,
I like the idea!
Not sure how you would control/ achieve the nominal separation (gap) and maintain it...Temperature control is one avenue.....
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