Is it that simple? To get the same size image with that 50mm lens you
have to enlarge the sensor cropped image more, enlarging the circles
of confusion. Would not that reduce the depth of field? What about
having to step back with the digital camera to get the same framing
with the 50mm lens? Would not that increase the depth of field?
Winsor
Long Beach, California, USA
On Dec 2, 2006, at 7:55 PM, Jim Couch wrote:
> As I understand it, depth of field is essentially for any given focal
> length, regardless of the format size. (DOF is the same for a 50m
> lens wether it is on an E1, an OM, or a medium format camera.)
> Because the E1 crops a section out of the middle of the lens
> (essentialy) it will have a SIMILAR PERSPECTIVE to a 100mm telephoto
> but the same DOF as the 50mm lens. To more clearly understand this,
> if you take the same photo, from the same place with a 50mm Zuiko on
> an OM and crop the resulting photo, it will be exactly the same as
> the photo taken with the E1 and the 50mm lens. (Allowing for the
> difference between film and digital.)
>
> I think the confusion becomes because of the tendency for folks to
> say that the E1 with it's 2x CROP factor will turn your 50mm lens
> into a 100mm lens. It does not, it is still a 50mm lens, and behaves
> as such, you are just cropping the picture down to the center
> portion. The result is that you get a picture that looks as if it was
> framed with a 100mm, but it still has the DOF of the 50mm.
>
> Jim Couch
>
> At 01:39 AM 12/2/2006, Moose wrote:
>
>> I don't remember all the details, but DOF with the smaller sensor is
>> generally greater than with FF film. With the 100/2 at f8 and the
>> DZ at
>> f9, and assuming the coverage is about the same, the DZ image will
>> have
>> more DOF.
>
>
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