I'm not sure it matters. I've never noticed much of a difference using
the Eq-S screen and use a gridded screen in preference to anything else.
I've never owned a liveview camera (except for the A1 and P&S cameras)
but I think precision focus should be done with liveview.
Chuck Norcutt
On 3/8/2012 7:05 PM, usher99@xxxxxxx wrote:
> Wanted this one to be superb for fast Zuikos. VF optics were
> redesigned and larger and I speculated there might be
> enough room (brightness) for using more precise screen.
> Seems this is not the case:
>
> Quote from Chuck Westfall (our Chuck is better)
>
> "The EOS 5D Mark III’s focusing screen has about the same overall
> brightness and depth-of-field characteristics as the EOS 5D Mark II‘s
> Eg-A standard focusing screen. This is a brighter screen than the Eg-S
> with most lenses, but it does not depict depth of field accurately for
> apertures wider than about f/4. Manual focusing accuracy using the
> optical viewfinder is about the same, lens for lens, on the 5D Mark III
> as it is on the 5D Mark II with an Eg-A focusing screen."
>
> (Totally agree with the f4 assessment on the OM5DII with stock screen.)
>
> More here:
>
> http://blog.planet5d.com/2012/03/questions-answered-for-the-canon-eos-5d-mark-iii-hdmi-video/
>
> Bah.
> Perhaps with improved AF, the chipped adapters will have better
> performance too. Reikan is thinking of supporting them
> according to his blog. They perhaps trigger AF confirm at edge of zone
> of acceptable as best I could tell. Microadjust (MA) may help,
> though that is total speculation. Mag LV is always best but not always
> possible.
>
> One good thing is the MA has adjustment on both ends of a zoom like the
> new flagship and unlike the 5DII.
>
> I suppose 3rd party screens will appear but then there is no menu item
> in the cam to fix the exposure changes and it is fussy to change them
> out
> and I now have less and less fussing time.
>
> They didn't follow the "if it ain't broke, don't fix it principle," Mike
>
>
>
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