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The reality is the human eye would struggle to pick up a slight decrease - lets say 1% due to dust on the mirror - at the eye piece. The human eye is not a wonderful quantitative measuring system. Its designed better to compare and see movement - we were hunters once! So though no difference may be seen at the eye piece dont mean there is no difference! If its a little dust I wouldn't worry - if its a lot I would clean it.
Last edited by Vanda; 17-05-2010 at 10:06 PM.
Reason: amended text.
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