Bubble Nebula and M52 : Stock 50D vs Mirrorless/Modded T2i (cxg2827)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: Bubble nebula · M 52 · NGC 7635 · NGC 7654 · The star 4Cas

Bubble Nebula and M52 : Stock 50D vs Mirrorless/Modded T2i, cxg2827

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Bubble Nebula and M52 : Stock 50D vs Mirrorless/Modded T2i

Powered byPixInsight

Bubble Nebula and M52 : Stock 50D vs Mirrorless/Modded T2i

I was curious about how removing the LPF-2 filter from a Canon DSLR as well as the mirror would compare against an unmodified camera. Images were shot on the same night on the same telescope to have matching sky conditions.

Processing was very minimal and was just quick and dirty for a comparison:

Stacked in DSS

Loaded in PixInsight as FITS

Dynamic Crop

RGB Channels Split

Linear Fit

RGBCombination

ABE

Unlinked STF Auto-Stretch applied to Histogram Transformation

Exported as TIF and scaled/rotated/cropped for both pictures to mostly match.

Revision A: Stock Canon 50D

Revision B: Modifed T2i (mirror removed for less vignetting and LPF-2 filter removed)

Revision C: Flat frame for Stock 50D

Revision D: Flat frame for mirrorless T2i

Revision E: Annotated Revision A noting the artifact left over after flat frame calibration

Revision F: Annotated 50D Flat frame showing the area causing the Hyperstar artifact

Some background:

Since purchasing the Hyperstar focal reducer, I kept experiencing a strange shadow artifact located at the bottom of the images while using the focal reducer. I originally thought it was a result of the the rectangular shape of the camera body obstructing the secondary. But after modifying my T2i I noticed that the artifact was no longer present, but wasn't sure if the fix was adding an IDAS LPS-D1 filter, the removal of the Canon LPF-2 filter, removal of the mirror, or better exposed flat frames.

Doing this comparison, I highly suspect that the vignetting from the mirror was the culprit for the leftover artifacts in my photos after flat frame calibration. So if any other DSLR Hyperstar users are experiencing a similar issue, consider performing a "Mirrorectomy" on your camera if its dedicated for astrophotography.

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Astrometry.net job	1356040
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Bubble Nebula and M52 : Stock 50D vs Mirrorless/Modded T2i

Bubble Nebula and M52 : Stock 50D vs Mirrorless/Modded T2i

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Bubble Nebula and M52 : Stock 50D vs Mirrorless/Modded T2i

Bubble Nebula and M52 : Stock 50D vs Mirrorless/Modded T2i

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