[IanCD]

I don't find the viewfinder enables me to manual focus accurately enough on close objects wide open. Although I could potentially use Live view (magnified), I'd need to use my glasses as my eyes won’t focus without them (I have cataract replacements in both eyes: bionic lenses, but fixed focus..!! <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='' /><img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' />).

So using Live View is a bit of a hassle. Hence trying to get autofocus adjusted as well as possible.



I used a pebble path in the garden today, focusing on a single brightly coloured leaf as focus point and checking the focus of pebbles nearer and farther away.



Results:

• I've gradually increased the micro-adjust to -20 (as far as it will move toward the camera) but in every picture the pebbles in front of the leaf are less sharp than those behind.
• This is not the case when I manually focus in (maginified) Live View: almost equal focus in front and behind selected focus point, marginally sharper closer
• I also compared results using my 16-85mm. Focus with that seems as sharp in front as behind the focus plane. Which makes me think it should be possible for the autofocus to be adjusted to work more accurately, in spite of what you’ve said, Rainer, about the difficulty UWA lenses present to autofocus systems – although I guess 12mm might be more difficult than 16mm.

3 new pics [url="http://iancds.smugmug.com/Tests/TEST-Nikon-12-24/19671189_b9tn3J#1543102218_3Vz5vdp"]here[/url], illustrating above (same link as before).



I’m satisfied enough to keep the lens, but am wondering if I need to get it calibrated / adjusted (with my camera) by Nikon..?



Arv: Thanks: is that the right way round? I thought Live View uses Phase detect and 'usual' is Contrast detect?