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Mike Crowle | all galleries >> Astrophotography >> Comets > Comet C/2025 A6 Lemmon
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25 Oct 2025

Comet C/2025 A6 Lemmon

The comet had brightened considerably, and was visible to the naked eye from my location. In the photo, the dust tail is wide, short and yellow-white, while the gas or ion tail is longer and bluish.
Cloud limited how many exposures I could take, though - more data would have meant I could reduce the noise further.

Canon EOS 7D Mark II ,Carl Zeiss Jena 135mm f/3.5 Sonnar M42
15 x 30-sec exposures at ISO 3200 and f/5.6, stacked on the comet and stars in Deep Sky Stacker software.
Result post-processed to reduce noise, increase contrast and reduce the stars. full exif


other sizes: small medium large original auto
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