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Comet Leonard (C2021 A1) (Dec 10 70mm).jpg
Comet Leonard (C/2021 A1) on the morning of December 10, 2021, with a 70mm telephoto lens for a field of view of 29° x 20°. The tail appears to be about 5° long here. Taken about 5:30 am MST. The distinctive cyan tint of a comet's coma is prominent. The comet was in Serpens at the time.
This is a stack of 3 x 1-minute exposures at f/2.8 with the 28-70mm Canon RF lens on the Canon EOS Ra camera at ISO 1600. The ground and area of sky closest to the ground comes from a single exposure to minimize blurring and the trailing of stacked stars from atmospheric refraction. The rest of the sky stacked with a Median stack mode to help eliminate satellite trails. Taken from home in southern Alberta. The bright blue horizon LED glow is from the Crowfoot Plastics plant to the east of me, on Highway 56.
This is a stack of 3 x 1-minute exposures at f/2.8 with the 28-70mm Canon RF lens on the Canon EOS Ra camera at ISO 1600. The ground and area of sky closest to the ground comes from a single exposure to minimize blurring and the trailing of stacked stars from atmospheric refraction. The rest of the sky stacked with a Median stack mode to help eliminate satellite trails. Taken from home in southern Alberta. The bright blue horizon LED glow is from the Crowfoot Plastics plant to the east of me, on Highway 56.
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- © Alan Dyer/AmazingSky.com
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