M42 & Horsehead H-alpha Test With Canon 100mm Lens


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This image © Copyright 2018, Michael Fulbright

With the full Moon up and impacted all my program targets I decided to pull out the ZWO EOS adapter I'd bought ages ago and try it with my Canon 100mm f/2.8 Macro lens. I used a mask with a 29.4mm opening on the end of the lens to approximate f/3.3. I tried with it wide open at f/2.8 and had really unattractive flaring stars. The mask seemed to control that mostly.

Date: 01/30/2018
Telescope: Canon 100mm f2.8 USM Macro
Mount: Astro-Physics Mach1GTO
Camera: ZWO ASI1600MM-Cool
Exposure: Astrodon Ha 1.25' 5nm: 150x60" (gain: 200.00) -25C bin 1x1