D600 Auto Focus Points - Who Thought That Would Be A Good Idea?

Started Mar 29, 2013 | Discussions thread
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TOF guy
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Re: AF points are IDEAL if put narrower/closer to center, just outside key pts, than wider
In reply to Sdaniella, Mar 31, 2013

Steve wrote:

if you ever adhered to the beginner's 'one-thirds' rule exactly, one will discover due to every OVF usage (which varies from one person to the next) means one's 'eyepoint' is never exactly on-center 100% (face and nose shape ensures this is impossible) when looking through the OVF.

I'm not aware of some parallax error which would make a viewer see the rectangles marking the position of a sensor at a different position than the rectangle really is (although the rectangles in the VF don't always exactly match the position of the underlying AF sensor).

it doesn't matter whether the OVF offers 100% view or 98/96/94%, because the AF points spread, are IDEALLY distributed NARROWER than you presume to want.

The AF points should ideally be distributed as evenly as possible accross the image to allow for maximum composition flexibility.

in PRACTISE, if you used an AF too far off center, which you presumed 'matched' your 'one-third rule' points, you'd end up RISKING OVERCROPPING your COMPOSITION, and thereby have NO MEANS of recovery in terms of Proportions AESTHETICS.

There are lots of composition mistakes one can make. A design offering maximum flexibility of composition at least does not restrain the photographer to a framing which may not be aesthetic. Anything else is undesirable.

By intentionally DESIGNING AF points that are just a touch NARROWER

There is no reason to intentionally design the AF points to be in a narrower region of the image. But there are technical realities which force the manufacturer to do so.

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Thierry - posted as regular forum member

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