D600 tack sharp AF but not manual focus

Started Dec 31, 2012 | Discussions thread
Marc Heijligers Contributing Member • Posts: 530
Re: when I was aged 14

Leonard Shepherd wrote:

By the time I started university at age 18 my eyesight had deteriorated so much without my realising that I had to move to the front of the class to read the writing on the blackboard!

How can you be sure? Probably nothing is wrong with your eyes, but the target you are looking to may impact the focus accuracy of your eyes. See  page 5 of the ICO Visual Acuity Measurement Standard, where it becomes obvious that different letters may not to have equal probability of recognition:


Please share a picture of your target, so that we can judge if it complies to ICO's standards. 

(more seriously: not a nice situation after such a promise from your operation, I hope your situation did not worsen much more after your observation)

 Marc Heijligers's gear list:Marc Heijligers's gear list
Sony RX1R Sony RX100 III Nikon D800 Sony Alpha 7R II Nikon AF-S Nikkor 14-24mm f/2.8G ED +8 more
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