Chuck, the DoF differences you mention would be true in the printed
image, but has no bearing on focusing since the magnification in the
viewfinder is essentially the same. The only major difference is that
the FourThirds finders are just cropped smaller.
Ctein wrote an interesting article about focus accuracy on TOP. This
isn't the first time he's matched topics with this list. Hmmmm?
AG
On Thursday, August 19, 2010, Chuck Norcutt
<chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
> Objection noted and accepted. 50mm is the relevant test lens for the
> OM. But I still have very strong doubts. Perhaps the much shallower
> DoF of a 50/1.4 would allow it but that's a much different kettle of
> fish than 24mm at f/3.2 on a 4/3 camera. To keep the DoF equivalent on
> the OM the 50mm would have to be focused at f/6.3.
>
> Chuck Norcutt
>
> Moose wrote:
>> On 8/19/2010 2:36 PM, Chuck Norcutt wrote:
>>> I think he just thinks he can. The last two markings for focus on
>>> the 24/2.8 are 3 meters and infinity. They are separated on the
>>> ring by about 2mm. If he can feel the ring move he already passed
>>> the difference between 5 and 6 meters.
>>
>> I'm objecting again. The original requirement was to differentiate
>> focus between 5 and 6 meters with a 24mm lens using enlarged (10x,
>> 14x?) Live View on a 4/3 camera. The equivalent exercise for OM/FF,
>> that is, with roughly the same subject area , at the same apparent
>> size relative to image area, in viewfinder/LCD, and eventually on
>> film/sensor, is with a ~50mm lens.
>>
>> How this got into trying to do it with a 24mm lens on an OM, I don't
>> know, but that is a much more stringent test - and I don't see the
>> point. (Well, I wouldn't be able to see it, would I, what with it
>> being half the size.)
>>
>> Pointedly Objectionable Moose
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