![]() ![]() With all due respect to the service technician, the information that you are reporting here is not 100% accurate. It would be interesting to know if this is really the case Is it possible for perfect calibration for many lenses, many bodies? On the other hand, since the focus consistency of the 5D is so well done for all the lenses, I guess it is reasonable to "learn" to focus on alternate spots of the subject to allow sharp wide-open shots. The minor down-side of this is that the 1D-IIn becomes the camera of choice for large-aperture shots with limited DOF. Since the consistency of focus is very fine indeed for each camera, he obviously has the skill to do the very best possible. The Canon service tech (who is VERY competent, IMHO) says he cannot do better than that- it is part of the design constraints of the cameras. The 5D, on the other hand consistently focuses in the back 2/3's of the DOF for all lenses. My 1D-IIn virtually perfectly focuses my 24 1.4, 35 1.4,50 1.4, 85 1.2, 100 F2, 135 F2, 300 F2.8, and zoom lenses - the point if maximum sharpness is where it should be - 1/3 to 1/2 into the depth of field region. The service tech here in Calgary indicated that it is possible to almost perfectly calibrate (within human ability) all lenses to a single camera however it is "impossible" (except by manufacturing accident) to perfectly do that with multiple bodies. One of the interesting things I recently found out is that my 1D-IIn and 5D cannot be perfectly calibrated to all of my 10 lenses. ![]()
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