Micro-Adjustment - missed opportunity?

Started Jul 22, 2011 | Discussions thread
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Micro-Adjustment - missed opportunity?
Jul 22, 2011

Since megapixels are still increasing, the 'weak spot' for many of us are lenses. Many of our lenses maybe "sharp" but are not focusing optimally.

Canon includes micro-adjustment, to take care of front or backfocusing.

But it is really a minimal feature that only can solve a portion of the problem.

If Canon really wanted to address the problem, the would include 16 or more micro-focusing points per lens. The user could adjust each lens at different aperture settings and at different focus distances. Zooms could be calibrated for different FL settings.

At minimum, a prime could be calibrated at 4 aperture settings, at 4 different distances.

This would cure focus shifting - as experienced with the 50/1.2. You could calibrate it for 1M, 2M, 4M and infinity; apertures of f1.2/2.0/2.8/5.6 (Above 8.0 DOF should cover focus error). The lens could interpolate adjustments in between.

Zooms - pick 2 distances, 4 zoom settings and 2 aperture settings.

Yes this would be a "PITA" - but if Canon is moving to 32MP sensors, focusing accuracy and precision needs to be improved. Sending in lenses/bodies to Canon is not a good alternative.

The focus shift of the 50/1.2 could easily be cured 'in-camera' and one reason I avoid it. Calibration problems are only going to get worse unless a firmware change provides more than one micro-adjustment per lens.

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