Perspective is controlled entirely by photographer-subject distance
(this can be proven by taking a shot at multiple focal lengths form the
same position, cropping down will show an identical perspective). The
crop factor only affects field of view, but since you would have to move
relative the
Adam's got it right, but there is a DoF gain of approximately one
stop for the field of view on 16x24mm sensor format over 24x36mm
film. Significant in some circumstances and not in others, depending
upon focal length, aperture and focus distance being used.
A little graphic:
http://homepa
Perspective compression is a result of the ratio of the focal length to the
distance(s) of the subject(s) being photographed. If you take two pictures,
one with a dslr and one with a film slr, and do not change the
camera-to-subject distance, the perspective compression will not change.
The f
Hi Russel,
On Tue, 21 Mar 2006 14:15:41 -0700, Russell Kerstetter wrote:
>I mostly lurk here, however I do have a question that I have had
>answered is two different ways, and always by someone who knows more
>than me.
>
>The Pentax dslr's have a 1.5 crop factor, so this means either:
>
>1) A 50m
On 21/3/06, Russell Kerstetter, discombobulated, unleashed:
>1) A 50mm focal length is still a normal perspective only with the
>sides cut off, because the sensor is smaller than a 35mm negative, and
>so the recorded image is simply smaller because of that.
>
>or
>
>2) A 50mm focal length
- Original Message -
From: "Cotty" <[EMAIL PROTECTED]>
Subject: Re: crop factor vs. telephoto factor
Over to our host for this evening, Mr W Robb !
It's just a different format.
William Robb
>
> From: "Russell Kerstetter" <[EMAIL PROTECTED]>
> Date: 2006/03/21 Tue PM 09:15:41 GMT
> To: pentax-discuss@pdml.net
> Subject: crop factor vs. telephoto factor
>
> I mostly lurk here, however I do have a question that I have had
> answered is two different ways, and always by someone who kno
On Mar 21, 2006, at 5:40 PM, Jan van Wijk wrote:
The perceived change is caused by YOU, changing your position to keep
roughly the same subject in view :-)
Perspective depends on STANDPOINT only.
On that given standpoint, the lens-focal length, and the size of
the image-area (film or sensor)
so..
if you were to take a photo at 50mm with an 8x10, 25mm and digital,
each time moving farther away to keep the same composition, and then
enlarge each to the same size print, they will be the same?
also..
so then on a large format, a 50mm is not really wide, it is just
larger, becaus
also, also..
> 1) A 50mm focal length is still a normal perspective only with the
> sides cut off, because the sensor is smaller than a 35mm negative, and
> so the recorded image is simply smaller because of that.
which is the one that really makes more sense is correct.
Russell
Russell Kerstetter wrote:
so..
if you were to take a photo at 50mm with an 8x10, 25mm and digital,
each time moving farther away to keep the same composition, and then
enlarge each to the same size print, they will be the same?
No, because perspective will change. Perspective is directl
Russell Kerstetter wrote:
also, also..
1) A 50mm focal length is still a normal perspective only with the
sides cut off, because the sensor is smaller than a 35mm negative, and
so the recorded image is simply smaller because of that.
which is the one that really makes more sense is
- Original Message -
From: "Russell Kerstetter"
Subject: Re: crop factor vs. telephoto factor
also, also..
1) A 50mm focal length is still a normal perspective only with the
sides cut off, because the sensor is smaller than a 35mm negative, and
so the recorde
- Original Message -
From: "Russell Kerstetter"
Subject: Re: crop factor vs. telephoto factor
so..
if you were to take a photo at 50mm with an 8x10, 25mm and digital,
each time moving farther away to keep the same composition, and then
enlarge each to the same size p
Emne: Re: crop factor vs. telephoto factor
On 21/3/06, Russell Kerstetter, discombobulated, unleashed:
>1) A 50mm focal length is still a normal perspective only with the
>sides cut off, because the sensor is smaller than a 35mm negative, and
>so the recorded image is simply smaller becaus
else-
Fra: mike wilson [mailto:[EMAIL PROTECTED]
Sendt: 22. marts 2006 09:33
Til: pentax-discuss@pdml.net
Emne: Re: crop factor vs. telephoto factor
>
> From: "Russell Kerstetter" <[EMAIL PROTECTED]>
> Date: 2006/03/21 Tue PM 09:15:41 GMT
> To: pentax-discuss@pdml.n
[mailto:[EMAIL PROTECTED]
Sendt: 22. marts 2006 00:28
Til: pentax list
Emne: Re: crop factor vs. telephoto factor
On 21/3/06, Russell Kerstetter, discombobulated, unleashed:
>1) A 50mm focal length is still a normal perspective only with the
>sides cut off, because the sensor is smaller than
Quite so, Bob!
Regards
Jens Bladt
http://www.jensbladt.dk
-Oprindelig meddelelse-
Fra: Bob Shell [mailto:[EMAIL PROTECTED]
Sendt: 22. marts 2006 13:31
Til: pentax-discuss@pdml.net
Emne: Re: crop factor vs. telephoto factor
On Mar 21, 2006, at 5:40 PM, Jan van Wijk wrote:
>
-
Fra: Cotty [mailto:[EMAIL PROTECTED]
Sendt: 22. marts 2006 00:28
Til: pentax list
Emne: Re: crop factor vs. telephoto factor
On 21/3/06, Russell Kerstetter, discombobulated, unleashed:
>1) A 50mm focal length is still a normal perspective only with the
>sides cut off, because the sen
Like they say - a picture is worth a thousand words.
Should cut down on bandwidth. ;)
Kenneth Waller
- Original Message -
From: "William Robb" <[EMAIL PROTECTED]>
Subject: Re: crop factor vs. telephoto factor
- Original Message -
From: "Russell Ker
DOF != CoC
best,
mishka
> DOF doesn't changs either. DOF is dertemined by aperture and focal length.
> Nothing else.
Til: pentax-discuss@pdml.net
Emne: Re: crop factor vs. telephoto factor
DOF != CoC
best,
mishka
> DOF doesn't changs either. DOF is dertemined by aperture and focal length.
> Nothing else.
--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.38
es exactly the same image -
althoug croped.
Regards
Jens Bladt
http://www.jensbladt.dk
-Oprindelig meddelelse-
Fra: Mishka [mailto:[EMAIL PROTECTED]
Sendt: 24. marts 2006 04:19
Til: pentax-discuss@pdml.net
Emne: Re: crop factor vs. telephoto factor
DOF != CoC
best,
mishka
DOF does
Oprindelig meddelelse-
Fra: Adam Maas [mailto:[EMAIL PROTECTED]
Sendt: 24. marts 2006 21:59
Til: pentax-discuss@pdml.net
Emne: Re: crop factor vs. telephoto factor
It's not even necessarily related to the format, as acceptable CoC on
digital will be determined primarily by sensor site
On Mar 24, 2006, at 4:37 PM, Jens Bladt wrote:
Not at all.
CoC is noramally defined as the acceptable "unsharpness", still
accepted as
"sharp" in a final images. CoC has nothing to do with HOW or by
what means
the image was made. However, this acceptable level of unsharpness
is often
def
Adam,
Using the diagonal as the standard one would expect the
normal for a 8x10 frame to be about 325mm while the practical
standard as you mentioned is only 210mm. That's approx.
only 65% of the diagonal.
Do you know where the large difference comes from?
Cheers,
Gautam
On 3/23/06, Adam Maas
- Original Message -
From: "Gautam Sarup"
Subject: Re: crop factor vs. telephoto factor
Adam,
Using the diagonal as the standard one would expect the
normal for a 8x10 frame to be about 325mm while the practical
standard as you mentioned is only 210mm. That's appr
://webpages.charter.net/graywolf
"Idiot Proof" <==> "Expert Proof"
---
William Robb wrote:
- Original Message - From: "Gautam Sarup" Subject: Re: crop
factor vs. telephoto factor
Adam,
Using the diagonal as the standard one would expe
William Robb wrote:
- Original Message - From: "Gautam Sarup" Subject: Re: crop
factor vs. telephoto factor
Adam,
Using the diagonal as the standard one would expect the
normal for a 8x10 frame to be about 325mm while the practical
standard as you mentioned is only 210m
well, i think that my question was answered, along with several other
questions that i did not knwo that i had questions about :)
so thank you for the mass of responses
Russell
Heh! PDML is like that. Everytime I've asked a question there's
been a deluge of answers. It's also the only place I guess where
people get emotional over aperture rings and the like. :)
Cheers,
Gautam
On 3/25/06, Russell Kerstetter <[EMAIL PROTECTED]> wrote:
> well, i think that my question wa
You think we're bad, the Nikonians MF and Rangefinders forum gets all
weepy over meter coupling prongs.
-Adam
Gautam Sarup wrote:
Heh! PDML is like that. Everytime I've asked a question there's
been a deluge of answers. It's also the only place I guess where
people get emotional over aper
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