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Check the settings and make sure DX crop mode is not enabled.
Do you have a Magnifying Eyepiece installed or a Right-Angle Viewing Attachment. The Right-Angle Viewing Attachment has a 1X or 2x magnification lever. I know you would have checked this but just in case.
So your saying that the standard round eye piece with the rubber is missing (which is a thin piece of glass)? Regardless that eye piece has no magnification.