On Mon, Feb 6, 2012, at 05:55 PM, usher99@xxxxxxx wrote:
> IFM writes:
> >If you use it on cameras with micro focus adjustment, which the 5D
> isn't, the
> >adapter may be set to micro adjust focus
> >based on testing. I don't have a camera with that feature as yet,
> though, so I
> >haven't used it.
>
> Hmm, the microfocus adjust (MA) chips predated use with MA feature in a
> cam body. The adjustments can be combined,
> but I know of no reason the chip can't be programmed on 5D classic.
> Starting from the same direction (I use infinity) and working
> s-l-o-w-l-y
> towards focus point may improve consistency. Magnified LV has been
> definitively shown to beat any AF. On the CV 180/4 the focus confirm
> is usually close enough but that is more forgiving given the larger
> dof. MA for zooms is generally a fool's errand.
My use of focus confirm is so intimately connected to my own judgment
using screen and eye that I wonder if I can really give a good
assessment of how accurate the Big-IS EMF chip is. By his own report
about the challenges of manual focusing for him, I think Chuck will be a
better tester. The only time I really need focus confirm is with wides
-- 35 and wider -- very nice to have for those lenses.
Joel W.
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