I have the SMC version of this lens. Mine was very sharp when stopped down a bit, but was giving me issues at very large apertures (more out-of-focus shots than in-focus). After shimming my focus screen, I finally got it dialed in and its now very, very sharp across the aperture range. Focus ring is buttery smooth, which makes it really easy to nail the focus. Don\'t notice any sort of color cast at all with this version.
If you\'re having trouble achieving focus at max aperture, it may be an issue with the focus screen position if you have changed out the screen. Canon sells washers that are strictly for this purpose...if you search the alt forum for \"focus screen washers\", you\'ll find a thread that I had started with the part numbers and telephone number for the Canon Parts Department. Big_is AF-confirm adapters seem to work well, as do those from happypagehk (Rudolf will code the chip to the lens\' max aperture and focal length...this info will appear in the EXIF).
Dec 13, 2008 at 07:14 AM
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