Sigma 28-300mm Aspherical IF I have a Sigma Aspherical 28- 300 and when I look through the view finder it is dark and does not clear up. I can take a picture and the picture is real dark. It started ...
sigma 70-300 AF lense We have been using this lense with our canon digital rebel Xti. But will this lense work with the new Digital Rebel XSI? if the lens is the older type with a macro switch which ...
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