ZWO ASI 174 MM camera

Quark Sodium Filter Solar videos from 25/6/2020

Videos from solar surface capture with Daystar Quark Sodium FIlter, Sky Watcher Equinox Pro 100mm OTA, ZWO ASI 174 MM camera 25/6/2020, captured in FireCapture on Windows laptop.

Each video is an AVI nearly 2GB in size.

Click on links below to download these files:

Sun_162333_250620_ZWO ASI174MM(23710916)080920@1242

Sun_162245_250620_ZWO ASI174MM(23710916)080920@1240

Sunspot 26/7/2020 @ 09:30, Lichfield

After a long hiatus with no sunspots, there is one at last.

Battling against a lot of cloud, I managed to get a few seconds of precious video in (about the only) clear spot there was and processed it to get the image below.

The photo suggests that my Quark is not quite flat to the image plain – I am not sure if this is the focuser or the Quark etalon itself – I do have a tilt adapter but today was set to 0 degrees.

Can anyone tell me which from the photo?

  • ZWO ASI 174 MM camera
  • Best 183 frames of 960
  • Sky Watcher Equinox Pro 100mm OTA
  • HEQ5 Pro mount
  • Stacked in AS!3
  • Deconvolusion in PixInsight
  • Final processing in Photoshop CS6


Calcium H image of the solar surface from 25/6/2020, processed 23/7/2020

ZWO ASI 174MM camera

  • Sky Watcher Equinox Pro 100mm OTA
  • Daystar Quark Calcium H filter
  • 1.9GB video file
  • Best 89 frames stackded in AS3
  • Processed in Photoshop CS6
  • Lichfield


I then ran the above image through PixInisght’s deconvolusion routine to produce following. Which do you prefer? Let me know!

Solar surface images Lichfield 19/7/2020

Photos taken in Lichfield, UK, 19/7/2020 @ 12:47pm.

  • Sky Watcher Equinox 100mm OTA
  • HEQ5 Pro mount
  • ZWO ASI 174MM camera
  • 30 frames per second.
  • Stacked in AS3
  • Deconvolusion in PixInsight
  • Colourisation in Photoshop CS6.


Do you think the image created from 39 frames or 166 frames is better? Although more frames potentially could give more detail it also can potentially add more blur as using lower quality images in the stack.

Best 39 frames out of 1039:

Best 166 frames out of 1039:

My best ever image of solar surface – yippee!

I have managed to get flat frame and dark frame to work in FireCapture – turned out to be really ease to get flat frame after all – just completely defocus the image of the solar disc with Quark still in, slightly adjust image so not at edge sun but in middle (when defocused adjust using mount hand control until reasonably bright across whole image no darkening near one edge), move exposure length slider (NOT gamma) until top histogram 1/3 from top edge, click on flat frame box and it will take flat frame. Dark frame, simply cover scope and press dark frame click box. Now flat and darks are automatically subtracted constantly – nothing else needs to be done……and Newtons rings are magically gone. Wow!

So here is my best ever image of the sun from today – notice the two dust bunnies – sorry about those!

Also (thanks Damian for the advice), I have tested my Quark H at different settings – and on my Quark best setting is (as Damian suggested) -5. No wonder I couldn’t get good photos in past when I was trying +3, following advice I’d received from another source that best setting on Quarks was 0-+3.

  • Sky Watcher Equinox 100mm OTA
  • HEQ5 Pro Mount.
  • ZWO ASI 174MM USB 3.0 Camera


Surface of sun 24/6/2020

Sky Watcher Equinox Pro 100mm OTA

  • HEQ5 Pro mount
  • ZWO ASI 174MM camera
  • Best 274 frames of 808 frames taken over 17 secs (FireCapture).
  • ASK3
  • ImPPG
  • Photoshop

Got dark frame to work on FireCapture but not flats so Newtonian rings (altering dark and white bands) still present – also some dust bunnies!


My picture turned out as below….ImPPG allowed me to move the black point to the lowest brightness pixel present – sprad out data BUT also left the impression that there are black flames on the sun’s surface(!) – or, as my daughter Hannah suggested, makes it look like the sun has blackheads (acne vugaris).

I have therefore inverted the image in Photoshop CS6 below. Which image do you prefer?