Major differences exist between MF and LF lenses in a focal length like
135mm, and something designed for small format (35mm). The small format lens
will invariably be a telephoto design, while the LF and MF lenses will more
likely (definitely in the case of LF) be a symmetrical design, with the
inherent corrections that come along with it. The rendering of the
different optical formulas is significant. All else being equal, a
symmetrical lens (or something close to it) will always have an advantage
over other designs, thus another advantage for MF and LF glass.
On 4/19/12 6:16 AM, "olympus-request@xxxxxxxxxxxxxxxxx"
<olympus-request@xxxxxxxxxxxxxxxxx> wrote:
>> Brings up Moose's point about larger format having an inherent
>> advantage in producing images with narrow dof with very sharp plane of
>> focus with nice bokeh.
>
> But the differences held even when the focal lengths were similar. A 135mm
> lens in medium format produces the same DoF as a 135mm lens in 35mm format
> when the subject on film size remains the same. If the focal length and
> subject-film distance remains the same, the only advantage to the medium
> format is the amount of room in the image you have to work with for
> cropping.
>
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