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Author Topic: Quark Field of View  (Read 518 times)

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Offline petevasey

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Quark Field of View
« on: 10:37:55, 23 August, 2016 »
It's sometimes difficult to know just how much of a given area will be visible when imaging the Sun with a Quark eyepiece because of the high magnification with the built in 4.2x Barlow.  So I've devised this sequence which *may* be useful to others  ;)

You need a planetarium program which will show the field of view from a given combination of camera chip size and telescope focal length.  In my case I'm using a GPCAM2 monochrome with a chip size of 4.8 x 3.6 mm on my TMB 105 which has a focal length of 650 mm.  Set up in SkyMap Pro the details are as the first image below.  The 2730 mm focal length is derived by multiplying the 650 mm focal length by the Barlow magnification of 4.2

Then in SkyMap I do a close up of the Sun with the frame superimposed, and remove any grid lines or other objects so all I am left with is the circle of the Sun and the image rectangle.  Second image below.

Kanzelhöhe Observatory (https://www.kso.ac.at/index_en.php ) is a very useful reference with regularly updated solar images, including a coloured image, and white light, Ha, and CaII images along with a sketch.  So I copy the Ha image, paste it into Photoshop and reduce it to a workable size.  Then paste the SkyMap image over that, reduce its opacity and position the rectangle on the subject of interest.  Third image below.  You can of course use any image you wish from the Observatory.

The only fiddly bit is getting the Skymap Solar disc the same size as the Kanzelhöhe image.  Just trial and error in Photoshop.  But once correct and the Skymap image saved, the job is done - just be sure to reduce the Kanzelhöhe image to the same size each time.   The images below are full size, but of course the image rectangle size will vary depending on the imaging system.  Once the Skymap Image is correct you don't really need the full circle, just the rectangle, but it's useful as a reference in case there is a variation in the Kanzelhöhe image size.

Cheers,

Peter
GSO RC10 Truss, Meade S5000 127, TMB 105, TS65 Quad, Solarscope SV50, Daystar Quark Chromosphere 'eyepiece' filter, Canon 15x50 IS Binos, various camera lenses.   Gemini G41 mount with Pulsar controller. EQ6 Pro mount, EQ3-2 mount with DS Autostar. Star Adventurer mount, QSI 683wsg, SX AO, Art285 (beta), Canon 350D (modded), Canon 700D, GPCAM2 (colour), GPCAM2 (monochrome), LE Vesta Pro, Toucam.

Offline petevasey

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Re: Quark Field of View
« Reply #1 on: 23:19:15, 23 August, 2016 »
And the proof of the pudding!

Image taken today (23rd August) of spot 12579 perfectly matches the Kanzelhöhe image with the Skymap rectangle (I had to rotate my image slightly to match up the spots)

Cheers,

Peter.
GSO RC10 Truss, Meade S5000 127, TMB 105, TS65 Quad, Solarscope SV50, Daystar Quark Chromosphere 'eyepiece' filter, Canon 15x50 IS Binos, various camera lenses.   Gemini G41 mount with Pulsar controller. EQ6 Pro mount, EQ3-2 mount with DS Autostar. Star Adventurer mount, QSI 683wsg, SX AO, Art285 (beta), Canon 350D (modded), Canon 700D, GPCAM2 (colour), GPCAM2 (monochrome), LE Vesta Pro, Toucam.

 

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