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OTA shadow in image- Help

astromerlin

By astromerlin
in Getting Started With Imaging

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astromerlin

astromerlin

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I have been imaging the Horsehead region over several sessions with an HA filter and during processing in PS noticed that I have a shadow of the OTA developing in the image centered on Alnitak. Does anyone know what caused this.

The OTA is my SW250 with Canon 1100d DSLR, 1.25" Ha filter placed right up against the camera (within the T2 adapter) plus Baader coma corrector. Image processed with darks and flats.

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