Observation by David Davies: The Trapezium

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David Davies


David Davies


2022 Jan 12 - 21:03


2022 Jan 20 - 20:16


The Orion Nebula (M42)

Planetarium overlay



Field centre

RA: 05h35m
Dec: -05°25'
Position angle: +1°34'

Field size

0°39' × 0°31'

  • 200mm Ritchey-Chretien with 0.7 reducer

4 sec, 30 sec, 120 sec


Cambridge, UK

Target name

M42 and M43


The Trapezium

About this image

This is my first serious use of the ZWO 294MC CMOS camera for deep sky imaging; my usual camera is a QSI 683.  So this is very much an answer to my question, "How does a CMOS camera work?". Answer, "Very well, indeed".


I was prompted to try this target after an online outreach session using the camera with Sharpcap. I was curious to see what the camera would produce and how I would then combine images taken at different exposures to produce a single high dynamic range image. The exposures were 4 sec, 30 sec and 120 sec. I needed to do quite a lot of work to separately process the images and then to combine and finish them. I don't have the aperture to resolve the fainter Trapezium stars but nevertheless, I'm pleased with the result.  

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