An Altair 60 EDF doublet refractor was fitted with an Altair 2” Herschel Wedge, into which a couple of cameras were fitted in turn, to take white light images of the sun. To avoid damage to the scope optics from the intense solar radiation through improper alignment of the scope with the sun’s rays, the scope was first aligned with the sun with the lens cap in place with the finder scope removed and the guide scope capped and turned away from the sun. A DIY solar pinhole viewfinder was fitted to the finder bracket and the scope slewed to produce a central point of light onto a transparent white tape disc used as a viewport screen. Once the sun was properly aligned through the scope optical train, the scope lens cap was removed and a 26mm eyepiece was fitted with a ND filter which was then inserted into the Herschel Wedge to centre the sun's disc in the FOV visually. After tuning the Wedge’s polarizing filter to achieve suitable brightness for imaging, the eyepiece was removed and replaced first with a ZWO ASI462MC camera which was fitted directly into the 2” wedge to achieve correct focus. Astro DMx Capture was then used to take several SER files of the top and bottom hemispheres of the sun to allow panoramas to be made to produce a full solar disc image. After sufficient imaging runs, the camera was replaced with a QHY5P-IIC camera capable of taking full solar disc images. After the initial run some dust issues on the camera chip required flat fields to be taken using Plexiglass to diffuse the sun’s light with the master flat produced used to cancel out the dust using Astro DMx Capture to capture dust free images. The SER files were stacked using 30% of the frames taken using Autostakkert! With processing completed in Adobe CS2 and Affinity Photo.
NB: DO NOT LOOK AT THE SUN THROUGH ANY OPTICAL EQUIPMENT WITHOUT PROPER FILTERS AND PRECAUTIONS USED
Click on an image to get a closer view
Solar Images:
ZWO ASI462MC – 30% of 1,982 frames stacked to give a total of 595 frames used to composite north and south hemispheres into a full solar disc image.
ZWO ASI462MC – 30% of 10,452 frames stacked to give a total of 3,136 frames used to composite north and south hemispheres into a full solar disc image.
QHY 5PII-C – 30% of 3,479 frames stacked (1,044 frames total)
QHY 5PII-C – 30% of 2,545 frames stacked (764 frames total) with live flat field correction applied
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