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Re: [OM] Doing the Splits

Subject: Re: [OM] Doing the Splits
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Thu, 19 Aug 2010 17:36:51 -0400
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.

Chuck Norcutt


C.H.Ling wrote:
> 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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