Ah... you are right about the diffraction limit, if using a 400MP FF sensor
my 28/2 will be diffraction limited even at F2.
C.H.Ling
----- Original Message -----
From: "Chuck Norcutt"
> At f/11 on a full frame sensor you are diffraction limited to about 13
> megapixels. You'll have to drop to about f/8 or even f/5.6 to resolve
> to the level of the sensor if your lens can do it.
>
> Chuck Norcutt
>
> C.H.Ling wrote:
>> I expected this could be your answer :-) I just too lazy to shot another
>> F11
>> or F16 shot. In that case you will not detect the 28mm shot's backgroud
>> is
>> out of focus and the 300mm shot will just look the same (serious out of
>> focus).
>>
>> Even I took another F11 shot you may say my 21MP sensor is too low in
>> resolution. I need a 400MP sensor since the COC used in the calculation
>> should be 0.003mm not 0.03mm. A higher pixel sensor is required :-)
>>
>> BTW, I just put 0.003mm as COC to the calculation, the DOF of 28mm lens
>> is
>> still much bigger than a 280mm lens with 0.03mm COC. Or the calculator
>> itself is wrong?
>>
>> I used the following data:
>>
>> F11, object distance 10ft, COC 0.003mm, the DOF of 28mm lens is 2.66ft
>>
>> F11, object distance 10ft, COC 0.03mm, the DOF of 280mm lens is 0.24ft
>>
>> http://www.dofmaster.com/dofjs.html
>>
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>
>
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