how inaccurate/unreliable is phase detect AF?

Started Jun 8, 2012 | Discussions thread
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Re: how inaccurate/unreliable is phase detect AF?
In reply to Marc Sabatella, Jun 12, 2012

Marc Sabatella wrote:

Meshuggah wrote:

while this makes sense in theory, i would like to know if FF or MF users have more errors than apsc users. a MF sensor is downright massive compared to apsc, and therefore offers a much shallower dof.

But it also offers a larger viewfinder, and I'd wager most medium format users are pretty accustomed to manual focus.

Agreed, and actually most lenses are f/2.8 or smaller apertures, so you greatly reduce focus problems from aberrations which are more likely in the f/1.4-2 range. Also, viewfinder mattes don't work less than f/2 or 2.8 or so unless you have a very dark viewfinder matte like the Canon EE-S, so the f/2.8 lens in the medium format camera doesn't require a special matte to focus.

I found the Pentax 645 film cameras extremely easy to get focus and for overall shooting. However, f/2.8 isn't that shallow depth of field, it is fairly comparable to a large aperture full frame lens. Typically, the available lenses for full frame allow for shallower depth of field than medium format.


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