C/2020 F3 (Neowise)
Taken by Dr. Sighard Schraebler on July 21, 2020 @
Karben, Germany
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Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
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Date Taken: 2020:07:24 16:22:11
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Details:
The comet is weakening meanwhile. Guests had already difficulty seeing it. Averted vision and averted hallucination is helping. In the sky, it is filling the area of my hand when I stretch it out. Slowly it is becoming an object for small telescopes. 30s ISO1600 is a good choice for my Pentax 3-inch refractor + A7s camera. Guiding was done with the Astro Trac. Initially, I had problems with the wedge, so I printed a fixed wedge in 3D to guide up to 15kg of equipment.
Watch out for the twist in the blue Ion's trail, indicating core rotation and the striae stripes in the dust trail sculpted by solar winds.
(Virtually) guiding the Comet’s head definitely brings out more details. I find startrails more honest than pinpoint stars, since guiding is now bound to the comet’s core itself.
When you get to the point in post-processing where you separate stars from comet and core from background, you can do everything in terms of color, contrast and repairs. I let part of the sensor’s imperfection remaining in the image. Obviously, Sony’s sensor has dual readout (left-right) and block wise self-calibration. When those camera-intern corrections are being activated, it is helping normal photography but it also introduces an unpredictable element to normal Dark-Bias-Flat calibration.
Photographer's website:
https://www.sternwarte-hofheim.de/galerie/schraebler/2020%20F3%20(Neowise)/
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