Observation by Peter Tickner: No telescope required!

Uploaded by

Peter Tickner


Peter Tickner


2022 Jan 05 - 20:00


2022 Jan 06 - 18:47


The Pleiades (M45)

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Field centre

RA: 03h46m
Dec: +24°07'
Position angle: +4°15'

Field size

2°26' × 1°51'

  • ZWO ASI2600MC Pro
  • Sigma 170 mm - 500 mm Zoom for Canon cameras
  • ZWO camera to lens adapter
  • EQ6 mount

Urban Berkshire

Target name

M45 - Pleiades


No telescope required!

About this image

I've been experimenting recently to see if any of my zoom lenses for use with a Canon DSLR would work with my ZWO deep sky cameras.  The results with a 75-300 mm Canon Zoom lens were disappointing due to its lack of light gathering ability. The larger Sigma Zoom has done better although it is reluctant to give round stars if pushed to its highest magnification. 

This image has been cropped to get rid of the worst distortion of stars at the edges of the field of view and with the Sigma Zoom set at 300 mm.  No flats or darks so surprisingly OK in the circumstances!


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Simon Paul Davis
Simon Paul Davis, 2022 Jan 07 - 16:10 UTC

Nice results! What F number on the zoom lens?

Peter Tickner
Peter Tickner, 2022 Jan 07 - 23:58 UTC

The Sigma zoom lens runs from f5 at 170 mm to f/6.3 at 500 mm so I imagine it was operating at around f/5.5 to 6 for my image.

Paul Leyland
Paul Leyland, 2022 Jan 10 - 16:51 UTC


Around here the sky background would be orange.

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