DOF has nothing to do with focal length, but with diameter of the
aperture opening. Aperture (not f-stop), magnification, and CC (although
usually CC is figured for an 8x10 print and can thus be considered a
constant) are all that affect DOF. Any other values in the formulas
resolve down to those three.
<sigh>
graywolf
http://www.graywolfphoto.com
"Idiot Proof" <==> "Expert Proof"
-----------------------------------
Adam Maas wrote:
And then you referred to the 'Extreme DoF' of APS formats, which
doesn't exist. There's a small shift, based on the acceptable size of
the Circle of Confusion, which goes down as the size of the
sensor/negative does, but by that argument, 35mm has 'Extreme DoF'.
It's the ultra-small sensors on most P&S cameras that have 'Extreme
DoF', but that's mostly a function of the extremely short focal
lengths of their lenses, as DoF is far more contingent of focal length
than CoC size. When your 'normal' lens is in the 7mm range, you will
see ridiculously large DoF at even large apertures.
-Adam
J. C. O'Connell wrote:
read the post again, I compared APS DOF
to LARGE FORMAT not 35mm
jco
-----Original Message-----
From: Adam Maas [mailto:[EMAIL PROTECTED] Sent: Friday, September
23, 2005 2:09 PM
To: [email protected]
Subject: Re: Sensors That Shift?
There's very little change in DoF between APS and 35mm. About a 1
stop difference in all.
-Adam
J. C. O'Connell wrote:
Not to spoil your fun but the extreme DOF
that APS formats low magnificaton yeilds
would make this of much less value say compared
to large format with its inherent lower DOF.
jco
-----Original Message-----
From: Glen [mailto:[EMAIL PROTECTED]
Sent: Friday, September 23, 2005 12:40 PM
To: [email protected]
Subject: Re: Sensors That Shift?
At 11:08 AM 9/23/2005, Mark Roberts wrote:
OK, how about sensors that *tilt*, for DOF control like you get with a
view camera?
...and, no, I'm not serious.
;-)
Oh, why not? I'm sure some people would make good use of it. I think a
tilt-shift sensor matched with a tilt-shift lens would be very fun
to play
with. Pentax has always liked to explore "alternative" film formats.
I think this would be a cool way for them to explore alternative
digital
formats.
I want a Pentax APS digital view camera. :)
take care,
Glen
