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SunSpots 2711 & 2712, Full Disc, HA & CA | Quark | May 25th 2018

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#1 MalVeauX

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Posted 25 May 2018 - 06:36 PM

Hey all,

 

Well, the clouds were thick and lots of rain today, but I got lucky with some sucker holes with some bad seeing around 2pm or so. Took the bait and I went to imaging. I recently added some saddles to my imaging platform for solar so that I could move between several scopes for different purposes quickly. It puts a ton of instruments on my mount, and it weighs a lot, but properly balanced it manages fine, and I'm still able to image reliably with the seeing being my limiter. This way once I get everything together, I can quickly image in several wavelengths and different scales. Today I bounced between HA (656.28nm), CA (393nm) & WL (540nm). I didn't get much time, so I didn't get to complete my sequences, but I got some data regardless. No real noteworth proms that I could find today, at least when I was browsing the limbs around 2pm Eastern time. So I focused on the spots and attempted a mosaic of the full disc.

 

Note: the Mosaic of the full disc in HA was done with 8 images. Please take a moment and see the full resolution via the Flickr link (or see my Astrobin link in my sig if you prefer). The full resolution image is totally different than the compressed thumbnail you see here.

 

Equipment:

 

Orion Sirius (HEQ5) Mount

Farpoint Side by Side Vixen Saddles (to allow dual mounts)

Celestron 120mm F8.3 with Orion ST8 piggy back mounted (with 60mm aperture mask)

Orion 80mm ED F7.5 APO with 50mm F3.8 finder scope piggy back mounted (with solar filter)

Quark Chromosphere for the HA

Skybender + dual stack of 393nm filters for CA

Baader Solar Film + Baader Solar Continuum filter for WL

 

The Triple-Threat!

 

27482347907_bd4a5b03bc_c.jpg

 

Results (Colored Data):

 

Hydrogen Alpha

 

42353103551_0baeeeb537_c.jpg

 

42353105771_5951504b97_c.jpg

 

Mosaic made with ST80 (60mm aperture mask, F6.6) with Quark (you have to look at the full resolution image on Flickr to appreciate the resolution in this mosaic):

 

42304752942_7e012b0523_c.jpg

 

28479788038_1d58281e69_c.jpg

 

Calcium

 

42304803782_8f0795f008_c.jpg

 

White Light for comparison

 

42353071021_77433f0022_c.jpg

 

Very best,


Edited by MalVeauX, 25 May 2018 - 08:39 PM.

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#2 MalVeauX

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Posted 25 May 2018 - 06:39 PM

Here's the B&W originals:

 

40546075970_4067361ddc_c.jpg

 

42353108051_48a26be135_c.jpg

 

40546051200_663947b97e_c.jpg

 

42304791862_b09516e23f_c.jpg

 

42304803312_47c12a9e38_c.jpg

 

Very best,


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#3 RickV

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Posted 25 May 2018 - 07:02 PM

Those are some mighty fine images Warren. waytogo.gif

However, I wonder... do you have enough telescopes fitted on that mount? smirk.gif

 

V/R

Rick


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#4 spereira

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Posted 25 May 2018 - 07:19 PM

That’s one heck of a setup, Marty, and those are some amazing images!

Thanks very much for sharing!

 

smp


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#5 MalVeauX

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Posted 25 May 2018 - 07:42 PM

Thanks,

 

The conditions were not horrible, but the cloud cover was relentless...

 

DSCF9031 copy.jpg

 

I got the new side by side mounting gear this morning, so naturally, after installing everything, the storms rolled in. But we had fun!

 

4 x scopes on one mount is such convenient fun in narrowband!

 

42296968072_962b7857e6_c.jpg

 

Very best, :)


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#6 boott

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Posted 25 May 2018 - 08:33 PM

Where's the cup holder!


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#7 MalVeauX

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Posted 25 May 2018 - 08:42 PM

The lack of any major proms was a little disappointing with so many wonderful active spots near the limbs. Limb + filaproms + spots would be amazing.

 

Cup holder is near the laptop. We were sweating buckets today, it was so hot and so humid!

 

Very best,



#8 rigel123

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Posted 25 May 2018 - 08:52 PM

That B&W shot of 2712 is gorgeous!  I should have thought about inverting mine, they always look better that way!


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#9 Jond105

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Posted 26 May 2018 - 12:22 AM

Man your pics are amazing. You're really making me think about the quark or any h-alpha scope for that matter for my future.
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#10 hopskipson

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Posted 26 May 2018 - 12:43 PM

Great imaging!  bow.gif  Thanks for sharing!

 

Got some time yesterday after work to observe what you captured.  Not easy fighting the wind on my balcony but worth it. 


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#11 nickatnight

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Posted 26 May 2018 - 12:52 PM

ACbounce.gif DC! bow.gif


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#12 RickV

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Posted 26 May 2018 - 04:12 PM

Marty, you look a whole lot different than I imagined!blush.gif  You're a whole lot younger and prettier!lol.gif

How you handle those four heavy telescopes is beyond me; maybe being so 'cute' others do it for you?

Still, as Nick said, "AC/DC"... so you have the right attitude.waytogo.gif

 

Now that the fun is over, I have a technical question.

In your mosaic full-disc images, there seem to be some horizontal bars across the image above and below the center of the solar disc.  The bars also appear to fan out on the right-hand side.  Do you have any explanation?

 

V/R

Rick


Edited by RickV, 26 May 2018 - 04:16 PM.

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#13 MalVeauX

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Posted 26 May 2018 - 05:04 PM

Hey Rick,

 

The bars are from imperfect stitching with minor newtonian rings still present even after flat calibration. I performed 8 sequences of video to cover the entire disc, and used a central flat that I made to calibrate them all, which worked well. But, when you compress the image scale down, the rings show up slightly again in this thumbnail view. So they were not 100% eliminated. I'll need to try to use my tilt adapter to completely negate them if possible next time (it's just time consuming). At full resolution view, it's not really noticeable. But when the scale is reduced, it pops out.

 

This is a hazard of trying to do mosaics or imaging in general at F25 and beyond, where imperfections start to pop out tremendously. Imaging at F6~8 is so much more forgiving of these kinds of things. The light cone shape makes a big difference with respect to the imaging train and what's going to show up.

 

Here's my master flat calibration frame for the mosaic that clearly shows the rings and other nasties:

 

HA_Flat_01.jpg

 

Very best,


Edited by MalVeauX, 26 May 2018 - 05:11 PM.


#14 Scott Beith

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Posted 26 May 2018 - 05:23 PM

Those are wall art level images!


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#15 MalVeauX

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Posted 27 May 2018 - 08:48 AM

And so the season begins...

 

Good bye sun... lol, I probably won't see much sun or any sky for... who knows.

 

So much for "sunny Florida!"

 

GoodByeSun.jpg

 

Very best,



#16 RickV

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Posted 27 May 2018 - 04:40 PM

Thanks for the explanation Marty; it makes sense.  Sounds like mosaics can be tricky.

Could you use a 100mm telephoto lens from an old SLR camera, dial the aperture stop down to f32, pop the Quark on the back using suitable adapters and image a full-solar disc?

 

V/R

Rick



#17 MalVeauX

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Posted 27 May 2018 - 06:06 PM



 

Could you use a 100mm telephoto lens from an old SLR camera, dial the aperture stop down to f32, pop the Quark on the back using suitable adapters and image a full-solar disc?

 

V/R

Rick

I have, I can use up to a 135mm with the ASI174MM, stop it down to F8 and I'm in business. I have a few. I generally used an old M42 mount Vivitar 135mm F2.8 stopped down to F8 for the Quark. Works fine.

 

The problem is the resolution is so very limited. Even with my 50mm guidescope (stopped down to 27mm for the Quark), and a focal reducer, I can do full disc. But the resolution again is so limited. I can preserve resolution when doing a mosaic, it just is more of a chore.

 

If the weather permits for the rest of the year, I'm going to tinker with my tilt adapter to see if I can better eliminate the newton rings and still continue with mosaics (looking at them in full resolution is a total different experience).

 

Ultimately the Quark is not a good choice for full discs, other than mosaics. For full disc shooting, it's likely better to simply use a short fast focal-ratio based etalon system like a Lunt or Coronado, all the little 35~60mm instruments that are F6~F10 and can do full disc shots with most sensor sizes while still having good resolution.

 

I sold my PST, even though it was good for full disc shots, because I was far less interested in full disc at that scale, and also didn't want a 2nd camera just for that scale (small pixel camera). Eventually I may add another HA scope to my kit if the price is right, but for now, I'll hold out. I should have jumped on that 50mm Lunt deal B&H had at the time, at $499 new, less limited than the PST with respect to cameras coming to focus and all that. The helical focuser isn't so bad at full disc scale.

 

I'm sure a small Lunt/Coronado (non-PST though) will crop over the next decade of the minimum.... hah.

 

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

 

Example, using a 50mm guidescope (190mm F3.8), stopping it down to 27mm with an aperture mask (now it's F7, so F29.5 with the Quark, right where it needs to be). Quark inserted, then 0.5x focal reducer on the nose of the ASI178 and/or ASI174 (I've had both for this purpose) camera. Full disc field of view. Fairly good contrast. Just poor resolution. At the end of the day, it was similar to what I was able to get out of my PST (with poor sampling as my ASI174MM's pixel size is a really poor match to the PST's F10), so ultimately, I sold the PST as I didn't want to have a second camera just for it.

 

Here's the 27mm aperture mask for my 50mm scope (190mm F3.8) to come to F7 (and F29.5 with the Quark):

 

32865012280_d9fea99229_c.jpg

 

Imaging train setup (note a 0.5x focal reducer is used on the camera side):

 

33091721472_23261ed7f1_c.jpg

 

Full disc with the Quark:

 

33621686212_dec8b3b995_c.jpg

 

It works, but it's not the resolution I would want.

 

Very best,


Edited by MalVeauX, 27 May 2018 - 06:34 PM.

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