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Advantages/Disadvantages to sending in camera along with lens for calibration?

Started Dec 21, 2013 | Discussions thread
acmatunl
OP acmatunl New Member • Posts: 16
Re: Advantages/Disadvantages to sending in camera along with lens for calibration?

CameraCarl wrote:

How do you know it is back focusing? Have you done detailed tests on a tripod to confirm this? If so and you are convinced that it is the lens, then you ought to send in the camera too, as it is the system that is giving you out of focus images. No sense in Canon determining that the lens is fine if it is the camera that is out of specification.

I followed these instructions http://regex.info/blog/photo-tech/focus-chart and until about f/8.0 the middle of the frame is soft and the sharpest point in the image is consistently a few inches behind the focus point, similar to this: http://regex.info/i/JEF_024927.jpg. I tested with a tripod, delayed timer, with & without live view, multiple shots at each aperture, and with every lens I have. Only the 50 demonstrated problems.

Thanks for the reply and suggestion!

 acmatunl's gear list:acmatunl's gear list
Canon PowerShot A640 Canon EOS Rebel T4i Canon EF-S 55-250mm f/4-5.6 IS II Canon EF-S 18-135mm F3.5-5.6 IS STM
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