![Quote](images/misc/quote_icon.png)
Originally Posted by
Alan
Ever hear of bullet points?
Bullet. Points. Sounds like you're talking about [url="http://en.wikipedia.org/wiki/Flechette]flechette[/url] rounds? [img]/emoticons/emotion-4.gif[/img]
While I generally agree with Rick (and subject drift and degradation is a characteristic of pretty much any forum), here's my summary:
[list][*]If your camera has AFMA, use it![*]Each lens + body combination must be calibrated separately (and lens + extender is treated as a separate lens).[*]AFMA is most important for wide aperture and telephoto lenses, where DoF is thin and focus is critical.[*]To correctly set AMFA, use a proper focus target (ideally a commercial tool, e.g. LensAlign, SpyderLensCal, etc.;Lensrentals.com rents out the LensAlign Pro) that is properly aligned to the camera, at a distance of 25-50 times the lens focal length.[*]To set AMFA [i]without[/i] a commercial tool, use a flat target with lots of detail, making sure it's parallel to the sensor.[*]Take several shots at each AFMA setting (iteratively bracketing or stepping through every adjustment), and select the best one.[/list]
Hope that helps....
--John
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