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Tried capturing M42 and horsehead nebula last night with my new Astro-modified EOS Rebel XT. During post processing I noticed these weird spots and lines across the image. Would you happen to know if this was because of the mirrors of the telescope (i.e. dirty mirrors) or is something wrong with the camera? What's weird is that this 2 images were taken with the same exact camera at the same exact position but some artifacts visible on M42 did not show up on the horsehead nebula. Btw I checked the mirrors of the telescope but I cant find the weird long spots