My eyesight requires that I wear glasses, although I'm not too bad off. I seem to have a recurring struggle with shots being in focus. When I use my 50mm f1.4 I expect that a slight miscalculation will cause an out-of-focus shot but it looks perfect in the viewfinder. I have struggled with this from day one and feel there must be a solution that takes into account people with slightly poor eyesight. Is there a company that can modify a viewfinder or fit an enlarged viewfinder on my Canon XTi ? Is there another solution that some of you who wear glasses have used? Thanks for any assistance.