James B.Davis wrote:
> I like the manual DOF button on the 10d.
I like the same feature on the EOS-1v, but I find it more useful for
showing what is unsharp rather than what is sharp. Working at 1/13 the
final-image CoC (assuming an 8x10 image from a 1.6 camera), it's by
definition impossible to see what's really sharp.
> I'm not sure what the difference is, this full manual depth system of the
> 100.
It's quite simple: focus on the near, focus on the far, and press the
shutter button (or the AE lock if you use CF-4) a third time to set focus
and f-number. Same process, really, as with DoF scales on MF lenses, only
much easier and faster. There are a couple of drawbacks:
1. You can't change the focus point in the middle of DEP, so you need to
focus and recompose. If the focus point is close, and is far from the
center of the image, you can focus slightly behind the intended object
(the hypotenuse of a right triangle isn't equal to the long leg).
2. The computed f-number is a bit small (more so than I would expect even
for a 0.035 mm CoC on a 24x36 camera), but this is easy enough to fix:
switch to manual mode and close down 1/2 to 1 step. On the
EOS-5/A2/A2E, you could do it with program shift. I usually go 1 step
further when exposure time permits, so that I get a CoC of about 0.025
mm. I had to make similar corrections with MF lenses.
Jeff Conrad
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