[IanCD]

[quote name='Brightcolours' timestamp='1319398903' post='12439']

No. phase difference detection is "normal" for DSLRs. Contrast detection is "normal" for compact digitals and live view with contrast detection.

[/quote]

Hi BC,

Ok, thanks.



[quote name='Brightcolours' timestamp='1319398903' post='12439']

The lens indeed does not seem to focus very accurately, although to me it sounds as if you are using a weird AF mode? Not sure, as I am not at home with the different Nikon nomenclature (the "servo" part makes me think of AF for shooting something that moves?).

[/quote]

Just 'normal' AF. Nikon literature for the D7000: “AF-S. Single-servo AF: for stationary subjects.” “AF-C. Continuous-servo AF: for moving subjects.”



[quote name='Brightcolours' timestamp='1319398903' post='12439']

The edges look rather crappy, but that may well be normal with this lens.

[/quote]

!!!

This lens model or this particular copy? Which pics / edges are you referring to?

I hadn’t seen that – I thought it seemed ok when borders in same focus plane or within DoF?

(lens test here doesn’t suggest border res. should be ‘crappy', even wide open)



[quote name='Brightcolours' timestamp='1319398903' post='12439']

You are right in thinking that adjusting AF with a micro adjust feature may be ok for one focal length but not another, that depends on the lens. [/quote]

Ok, thanks.



[quote name='Brightcolours' timestamp='1319398903' post='12439']

It should more or less function fine without, and it seems as if it does not.

[/quote]

What I’ve read (e.g. Robert Ciala’s articles, post [url="http://forum.photozone.de/index.php?/topic/1388-article-really-worth-reading/"]here[/url]) suggests that it depends on the particular lens-body combination: if one is at the limits of specs in one direction, and the other is at the opposite limit, fine-tuning AF is going to be needed.



That said, I am wondering if this lens is indeed out of spec.

Ian