Theory says a 4/3 camera starts to exhibit diffraction effects (even
with a perfect lens) at about f/5.6. I say "about" since diffraction is
frequency dependent and varies with color. f/5.6 fits the middle of the
green channel, blue has a tighter spec and red a looser one. If Moose
can see distinct softening at f/22 on 35mm then that probably does
equate to a roughly equal effect on 4/3 at f/11.
Dr. DOF
On 3/1/2012 10:23 PM, Moose wrote:
> On 3/1/2012 5:29 PM, Brian Swale wrote:
>> A Zuiko len ( do I have that right, there was only one of them)
>> fortuitously came my way. Today the whole fam damly have taken
>> themselves off to distant parts, so I can do whatever I please :-)
>>
>> So I chose to try it clipped onto the D-3. It's an overcast day
>> sometimes a little brighter, sometimes not.
>>
>> http://www.brianswale.com/zuikoholics/2012/March-2012.htm
>>
>> Some of the metal-work (the front ring) has seen better days, but
>> the glass seems very fine.
>>
>> What do you think?
>
> Well, the 135/4.5 is an excellent lens. On 35mm, I found it to be
> clearly starting to soften from diffraction at f22, but with the
> greater DOF worth it for some subjects and modest display sizes. But
> it is definitely soft at f32, with that overcoming any benefit from
> DOF.
>
> As Dr. DOF would be quick to point out, that means f22 is trouble for
> 4/3. It's just fine for web size, as your images demonstrate, but I
> wouldn't stray beyond f11 on 4/3 if planning to print larger - at
> least without testing.
>
> Fine Focus Moose
>
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