> Lemme get this straight:
>
> From 36*24mm, you need to enlarge roughly 5 times to get a 5*7.
> From 24*16mm - surely you need to enlarge by 7 times to get the same
> 5*7?
>
> What has this to do with pixels?
The "size" of a digital sensor isn't strictly dimensional. The number of
pixels dete
J. C. O'Connell wrote:
> DSLRs use smaller sensors than 24 X 36 mm 35mm film does.
> Thus, for a given angle of view, they use shorter focal length
> lenses. Shorter lenses give better depth of field.
More DOF is not always better!
Cheers,
- Dave
http://www.digistar.com/~dmann/
William wrote:
> If the subject size is kept the same on the film (reproduction
> ratio), then DOF will also be the same at any given aperture, no
> matter what format you use.
True. But that was not was I was getting at. I was talking about the same angle of
view from the same shooting distance
- Original Message -
From: Pål Jensen
Subject: Re: DOF in DSLRs - HELP ME PLEASE...
> William wrote:
>
> > Reproduction ratio is how large the subject is on the film,
not
> > the print.
>
>
> Then we agree...
More than likely.
I suspect there might be a difference in semantics is all.
- Original Message -
From: Pål Jensen
Subject: Re: DOF in DSLRs - HELP ME PLEASE...
> William wrote:
>
> > > If you shoot the same subject at the same subject size
(angle
> > of view) with the same subject camera distance at the same
> > aperture but with dif
William wrote:
> Reproduction ratio is how large the subject is on the film, not
> the print.
Then we agree...
Pål
Butch wrote:
> As a photofinisher I must disagree. Technically only 1 point is in actual
> focus, everything else is increasingly out of focus (circle of confusion).
> So as you enlarge further, less area is perceived to be in focus.
The point in focus will be equally less sharp with magnificat
- Original Message -
From: Pål Jensen
Subject: Re: DOF in DSLRs - HELP ME PLEASE...
> > Depth of field is a factor of reproduction ratio and
aperture.
> > Focal length doesn't enter into the equation.
>
>
> No. DOF has everything to do with focal lenght. R
William wrote:
> > If you shoot the same subject at the same subject size (angle
> of view) with the same subject camera distance at the same
> aperture but with differnt focal lengths, you'll get different
> DOF. This is the effect we are discussing here.
>
> What you are describing is impossibl
- Original Message -
From: Pål Jensen
Subject: Re: DOF in DSLRs - HELP ME PLEASE...
> If you shoot the same subject at the same subject size (angle
of view) with the same subject camera distance at the same
aperture but with differnt focal lengths, you'll get different
DOF. Thi
Close.
DOF is determined by a combination of focal length and diaphragm opening
diameter (aperture).
All 150mm lenses @ f8 have the SAME dof (providing for minor variations
because of varying lens designs). It doesn't matter if the coverage of the
lens is for 24x36mm or 6x7cm or 4x5in. 150mm is
On 28 Nov 2002 at 12:12, Herb Chong wrote:
> Message text written by INTERNET:[EMAIL PROTECTED]
> >From 36*24mm, you need to enlarge roughly 5 times to get a 5*7.
> From 24*16mm - surely you need to enlarge by 7 times to get the same
> 5*7?
>
> What has this to do with pixels?<
>
> there is an a
confusing...
> -Original Message-
> From: Mike Johnston [mailto:[EMAIL PROTECTED]]
> Sent: 28 November 2002 15:20
> To: [EMAIL PROTECTED]
> Subject: RE: DOF in DSLRs - HELP ME PLEASE...
>
>
> > Yeah, but presumably they also use the film format? I know fcalc
>
> Yeah, but presumably they also use the film format? I know fcalc
> prompts asking what format you want the COC for. Changing this from
> 35mm to APS (roughly what a DSLR does) reduced the DOF as a larger
> magnification would be required to compensate at the enlarging stage.
> Increasing your d
William wrote:
> Depth of field is a factor of reproduction ratio and aperture.
> Focal length doesn't enter into the equation.
No. DOF has everything to do with focal lenght. Reproduction ration doesn't eneter the
picture even if the DOF scale on your lenses are decided with reproduction ratio
> DSLRs use smaller sensors than 24 X 36 mm 35mm film does.
> Thus, for a given angle of view, they use shorter focal length
> lenses. Shorter lenses give better depth of field. I get great
> MACRO shots with my digicam that would be impossible with
> 35mm or God forbid 6X7.
Seconded. It's exact
ect: Re: DOF in DSLRs - HELP ME PLEASE...
>
>
> At 06:43 28.11.2002 -0600, you wrote:
> >Depth of field is a factor of reproduction ratio and aperture. Focal
> >length doesn't enter into the equation.
> >
> >William Robb
>
> Hmm.. the equations (hyperf
I have just read
http://www.luminous-landscape.com/tutorials/understanding-series/dslr-ma
g.shtml where again the lecture on DSLRs having greater DOF rears its
head. Unless I am severely mistaken this is absolute hogwash!
"One other subtle benefit is the greater depth of field. To frame a head
an
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