Do you have a skybender?

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MalVeauX
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Re: Do you have a skybender?

Post by MalVeauX » Tue Jun 19, 2018 7:08 pm

Hrm,

I'm considering trying another configuration to simplify things and allow for more in-focus ability.

The internal tilting cell in the skybender can have a filter threaded in from both sides. I'm thinking of getting two 2" to 1.25" cell adapters to mount my 1.25" 393nm & 1.25" 370~395nm filters and put the 2" Baader blue filter (ERF) on the nose of the skybender, then put the 370~395nm cut filter on the nose-side (semi-permanent) of the tilt cell, and a 393nm filter on the camera side of the same tilt cell. Then the final 393nm filter goes on the nose of the camera. Tilting still works. And the ERF is in place, and the cut filter behind it. Should work in theory. It would allow the ERF to go into the focuser fairly deep into the light cone. And this would allow as much in-focus travel as possible.

I'm finding that with my 50mm extension (I use this to get the ERF deeper into the focuser), that I lose the in-focus travel and can't come to prime focus with my 1.25" skybender unit and my ASI174MM on most of my scopes (I can come to focus on my ED80) for full disc FOV. My 120mm F8.3 and my ST80 (80mm F5) don't have enough in-focus travel to use the 50mm extension and get prime focus with just the Skybender. I was able to with the the ED80 again, but I'd rather not use that scope. So I just bought a 35mm 2" extension to shave off 15 more mm and hopefully that will be enough. If that works, I'll be able to easily full-disc image in 393nm with the ST80 (masked to 60mm) with just the skybender and the 35mm extension tube to act as the ERF cell holder deeper in the focuser. If not, I'll pursue the idea above that removes the extension completely and houses all the filters in the larger 2" skybender unit.

+++++++++++++++++++++++

I'm also wondering what other filters to potentially try. I currently have a set of 393nm filters and a 370~395nm filter to complete the Calcium set. I also have a pair of 532nm filters (green) that Apollo sent too. I have my 540nm solar continuum filter that could serve as the cut filter there. I would just need an appropriate ERF, maybe the Baader Green G-CCD filter if I can find it on sale without having to buy the kit? The green version of the blue filter basically. Granted, this is just basically a white light filter focusing towards green, which I already do with a baader solar film + solar continuum filter setup and that works fine. Was just curious to see if the 532nm filters with the 540nm filter and some kind of ERF would be better with more contrast and definitions of features.

Maybe something to fiddle with that is similar to the Baader Solar Film + Solar Continuum, or between it and something like the Quark Magnesium, etc, all of which just look like different green white light filters in terms of what features can actually been seen ( at least at these not-so-narrow bandpasses).

None of these are as tight as what is found with a Quark Calcium/Magnesium, or the Lunt Calcium units, but they're interesting at a fraction of the cost, and different from straight white light.

I'm guessing the 540nm or 532nm will be ideal for convection cells, at high resolution.

Very best,

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Re: Do you have a skybender?

Post by TheSkyBurner » Tue Jun 19, 2018 10:56 pm

I would put the 395 filter in the tilt cell of the 1.25" skybender, have it tilted at like 10 degrees. Place one 393nm filter on the nosepiece of the 1.25" skybender, and one 393nm filter onto the camera. This will off throw the reflections from the paralell 393 filters, and simultaneously move the cut off wavelength of the 395 filter closer to 393nm.

I would then keep the 2" b-ccd filter tilted in the 2" skybender to throw off all reflections from the rest of any filters you add.
2 - 1.25.JPG
2 - 1.25.JPG (21.68 KiB) Viewed 531 times

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Re: Do you have a skybender?

Post by Merlin66 » Wed Jun 20, 2018 2:54 am

Instead of a 2” extension, with the associated back focus issues. I’m using a series of 48mm filter spacers, about 70mm long.
These then position the Baader CCD filter well inside the focuser and allow plenty of room. For the SkyBender etc.
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MalVeauX
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Re: Do you have a skybender?

Post by MalVeauX » Wed Jun 20, 2018 3:40 am

I did the 370~395nm filter in the tilt chamber for a while. And I stacked both 393nm together on the nose of the camera. This was Apollo's recommendation. KG3 IR absorption filter on the nose of the `bender. I used it that way for a long time, since that's how he suggested to do it. I've imaged with it a lot and with this current configuration, it's the visually returning the same data. I've processed gigs and gigs of data at this point and the results are repeatable no matter how I configure it as long as the heat is managed. Currently the new setup with the blue filter as an ERF is much better at dealing with the thermal issues than the KG3 approach. So that's a nice relief. I've cracked two KG3's now, so I'm definitely glad to be done with busting filters.

I don't have issues with reflections with respect to the visual (from camera) and resulting images. I have some dust of course, but my flat calibration takes care of it nicely.

Very best,

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Re: Do you have a skybender?

Post by MalVeauX » Wed Jun 20, 2018 7:19 pm

Used the Skybender this morning with some wonderful sunspots to hone in on. Used the same setup as yesterday, Baader Blue B-CCD Filter as ERF -> 50mm extension -> 370~395nm Cut filter on nose of skybender -> 393nm in chamber, tilted for contrast -> 393nm filter on nose of camera (with or without barlow) -> ASI174MM camera.

Some results today:

Image

Image

Image

Very best,

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Re: Do you have a skybender?

Post by TheSkyBurner » Wed Jun 20, 2018 11:05 pm

thats awesome, your close up shot is revealing flare activity. It would be wild if you could just do a 5 minute animation!

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Re: Do you have a skybender?

Post by MalVeauX » Mon Aug 20, 2018 7:51 pm

Used the Skybender today to try some 393nm imaging of our new sunspot 2719 with comparisons in several wavelengths.

Skybender in the imaging train:
skybender_08202018.jpg
skybender in imaging train
skybender_08202018.jpg (93.76 KiB) Viewed 276 times
Filter placement:
skybender_2_08202018.jpg
skybender config with ERFs and filter placement
skybender_2_08202018.jpg (95.45 KiB) Viewed 276 times
Image

Three wavelength comparison, skybender used for the 393nm. I think it's fairly tighter bandpass than just loose white light, because I was able to, in good seeing, capture convection cells and AR2719 with the 370~395nm filter, then I just added the two 393nm filters and was able to image the same AR2719 and the convection cells are gone, focus is achieved, seeing is good, and there are smears that seem to resemble spicules from the chromosphere, mixing with the convection cells, so I'm not quite on calcium, but I'm close enough to nearly represent it at least as this is clearly not just white light as the convection cells are literally gone at the same scale.

Image

Image

Very best,

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Re: Do you have a skybender?

Post by TheSkyBurner » Thu Sep 20, 2018 5:55 am

so i just got done conceptualizing/prototyping a new skybender. It is 40% smaller, and now 100% modular. Crazy.


:shock:
new skybender prototype A.jpg
new skybender prototype A.jpg (53.16 KiB) Viewed 202 times
new skybender prototype b.jpg
new skybender prototype b.jpg (50.9 KiB) Viewed 202 times

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