Venus, Oiii and CaK

I used my usual Venus gear: EQ3 with the added ST4 port, N150/750, filterwheel, OIII + VenusU and CaK, ASI 178MM cooled.
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Venus, full spectrum

This time I used a very modest setup: the sky wasn’t promising, and indeed, the seeing was quite bad. So I put together the MC102/1300 with a barlow and an ASI 120 MM with an UV/IR cut, to capture Venus. Otherwise the unguided EQ3 did its job, given the lower magnification.

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The gear is the same, but I deployed a new workflow: I start the editing on the raw stack, before applying any wavelets. The reason for this is that Venus has a nasty habit of its edge going easily overexposed. The pictures are through the Venus U and the Ca K-line filters, combined with the OIII filter.

2020-04-22. Venus U and OIII

2020-04-23 CaK and OIII

So the steps:

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Same gear, this time I pushed ten minutes into the CaK and also at around ten into the OIII, though for the latter without a particular reason (I forgot to press stop).

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Venus in CaK and Oiii

The gear, as usual, was the N150/750 on a modded EQ3 autoguided by the soapbox project. As a camera, it was the modded-to-be-cooled ASI178MM, with an automated, originally manual filter wheel. I used the OIII and the CaK filter this time, to create to bicolor combo.

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Same gear as before, too lazy to write it down yet again. The green and CaK filters got into this picture.

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Venus, green plus calcium K

The same exact gear, it’s getting boring to write it down. Only this time, it was between passing clouds, quite annoying.
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Venus green+U

The same gear, but now the fully automated filter wheel with its hand controller optionally connected to the soapbox project and the desktop app now controlling sharpcap — telling it which filter is active. This day the Venus U filter yielded the best result.

In fact, the pros and cons in my experience with Venus, two different barlow lenses and two different scopes, the N150/750 and the N250/1200:

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CaK and red combined

Same exact gear as before. (tovább…)