I didn't say better or worse DOF, just different. I skimmed through all
that DOF thread and saved some for later study and elucidation. I do
think that, for the same final image size, the MF confused circles ( ;-)
) are magnified less than the circling confusion of 35mm, leaving the
final confusing circles about the same size (on the final viewed image,
not the film) for equivalent coverage lenses on both formats. Maybe a
DOF maven will confirm or deny - treatise not necessary, but possibly
unavoidable .
I was simply supporting to my overall point about matching the tool to
the job, not saying that any format is better or worse in any sense
other than suitability for a particular task. Miniature, Half frame,
35mm, MF and LF each have tasks they excel at compared to the others and
jobs for which they are ill-suited. Vive le differance.
Moose
Andrew Dacey wrote:
On 1/11/02 6:24 PM, "dreammoose" <dreammoose@xxxxxxxxx> wrote:
There are a lot of good things about MF. Two of the limitations that
haven't been discussed yet are lens speed and focal length limitations.
MF lenses are almost always slower than their 35mm equivalents, often
considerably slower. This doesn't just mean tripods, etc., it also means
different ability to use DOF creatively.
Moderate telephoto lenses are big, heavy, slow and expen$ive.
Longer telephotos are almost (I say almost so I won't get dinged with
some exotic!) non-existent. 300mm on 35mm requires 700mm on 6x9. 500mm
is 1180mm! Of course, you can crop down to the image area desired for a
tele perspective, but then you are using a big camera to make a little neg.
Not to disagree with you but I would like to point out a few things.
While lens speed can be a factor, issues with DOF control are probably
minimised. The reason for this is because the larger format has a smaller
DOF. To get the same framing from the same spot you would use a longer lens
on the larger format. This reduces the DOF. So even though the lens is
slower, you may actually have less DOF with that lens shot wide open, than
the equivalent smaller format's lens shot wide open.
However, you're definitely more limited in choice of lenses especially on
the long end. Not to mention issues with size and weight. First off, there's
the issue that every lens you have is a longer focal length than the 35mm
equivalent, they're also usually bigger. My Mamiya's 80mm 2.8 is huge
compared to my Zuiko 85mm 2.0 for instance.
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