I'm not going to further discuss about this issue as there could be big
difference between our eyes. Although I have 20/20 vision I cannot
differentiate 5/6 meter targets with 24mm lens on the OM focusing screen and
I always found liveview is much easier than the focusing screen for critical
focus but Ken seems to have different experience on that. I have a little
doubt when the DoF is so big even with CoC of 0.006mm one can still see the
difference on the focusing screen with naked eyes.
C.H. Ling
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
>I hesitate to say this since it's not my intention to cause a new flurry
> of testing but, if it can't be done with 10X live view on 4/3 at 24mm I
> don't believe it can be done with at 50mm with an OM and 2-13 screen.
>
> Chuck Norcutt
>
>
> Moose wrote:
>> On 8/18/2010 7:10 AM, Ken Norton wrote:
>>> Out of curiousity, I fired up the OM-3Ti last night and attempted to
>>> focus on my targets at 4, 5 and 6 meters. Using the 50mm F1.4 lens, I
>>> was able to individually select the focus using the ground-glass on
>>> any of the three targets. The 2-13 screen has a nifty feature, though.
>>> When in focus (or nearly so), it shimmers. I've used that function
>>> many a time. Between the 5 and 6 meter targets, focusing wasn't overly
>>> easy and in low light or when focusing on a low-contrast object I
>>> would say that it requires a little back and forth tweaking to find
>>> the sweet spot. But in normal light with normal contrast object, I
>>> wouldn't hesitate to say that it wasn't a problem.
>>>
>>> With the 24mm F2.8 lens, things are a different story.
>>
>> But in the context of the "Great Focus and DOF Test" you don't need to
>> focus 24mm on FF to that accuracy, do you? I'd
>> think 50mm on FF is the equivalent, for this test, of 25mm on 4/3.
>>
>> Moose
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