Back focus

Originally posted to patrickphotos.co.uk 21 April 2014

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I’ve noticed when using a couple of my lenses that the pictures weren’t coming out as sharp as I would like.

At first I thought it was the ageing process in me,  and could be corrected with a visit to the opticians. However, testing the lenses in a controlled environment showed that they are back focusing. This is when the actual focus is beyond the point that is commanded to the lens by the camera in auto focus mode.

A trip to the opticians is what is needed if you are working in manual focus, as there is nothing else to blame if you are working in this mode. But in this instance, the lenses may just need some TLC at Fixation.

Makes sense for me to post the nerdy/geeky articles on here rather than on my main site. So you may see more of these moved over here.

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