I think it is better to describe as OOF softness. With 4/3 people think it
is necessary to open two stops to get the same OOF effect as FF camera. i.e.
to get the same OOF softness you need 40mm F1.4 in 4/3 and 80mm F2.8 for FF
under the same object magnification.
C.H.Ling
----- Original Message -----
From: "Chris Barker"
> No, you're right, it doesn't change. But to all intents and purposes, to
> the photographer, it's an 80/1.4.
>
> I don't understand CH's point though ...
>
> Chris
>
> On 6 Jan 2010, at 09:25, Wayne Harridge wrote:
>
>>> I think that you're right, Andrew. the 40/1.4 becomes an 80/1.4 with
>>> the 2x crop factor of the 4/3 cameras.
>>>
>>
>> It doesn't become anything different, it's still a 40/1.4 but has the
>> angle
>> of view of an 80mm lens on 35mm FF. f1.4 is still f1.4, focal length is
>> still 40mm.
>
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