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Thank you, Raymo and Kevin. I didn't make dark files by laziness, and it was my first capture of binary with Canon T3. I was using my old 350D, now without IR filter. There are some noise in it.
I was surprised by the vibration of Canon T3 with low time of exposure. I needed to shot with virtual mirror lock up from BackyardEos. My 350D don't has this problem of vibration.
The resolution of image change because of position of the rule in Photoshop. But they are with low variation: from 0,77 to 0,90 arcsec/pixel. I think I can work safely with around 0,85"/px.
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