Archived posting to the Leica Users Group, 2003/04/24

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Subject: Re: [Leica] Digital Aesthetic
From: "animal" <s.jessurun95@chello.nl>
Date: Thu, 24 Apr 2003 13:38:45 +0200
References: <004201c309b2$535c9170$0316fea9@ccasony01> <007f01c309d5$9a405fe0$9cad5018@gv.shawcable.net> <007301c309e5$0830ea10$0a01000a@basecamp2win> <001801c30a53$d88257d0$c3ac7fcb@ctl.creaf.com>

Well could look it up but i think the magnification factor is the key.same
magnification same dof.So a wide angle close up would give the same dof as a
lele lens further out as long as the mag.stays the same.Therefore the format
has to do something with it for the same reason.
simon
- ----- Original Message -----
From: "Red Dawn" <reddawn@singnet.com.sg>
To: <leica-users@mejac.palo-alto.ca.us>
Sent: Thursday, April 24, 2003 1:22 PM
Subject: Re: [Leica] Digital Aesthetic


> ----- Original Message -----
> From: "Jim Laurel" <jplaurel@nwlink.com>
> Subject: [Leica] Digital Aesthetic
>
>
>
> > Correct me if I'm wrong, but I believe depth of field is related to
focal
> > length and aperture size alone.  The depth of field of a 25mm lens is
the
> > same regardless of the size of the film or digital sensor.  Consider the
> > example above and let's assume that the film shooter is using a 50mm set
> to
> > f1.4.  To acheive the same FOV, the DSLR user will need a 31mm lens.
But
> > lenses around this focal length with maximum apertures of f1.4 are few
and
> > far between, not to mention that a 31mm lens at f1.4 will still have
more
> > DOF than a 50mm at 1.4.  The DSLR shooter could use the same 50mm f1.4
> lens,
> > and back off from the subject, but then again, the increased distance to
> > subject will result in increased DOF.
>
> Hi Jim,
>
> i do believe u're wrong.
>
> Let's take the EOS 10D with a 50mm f1.4 lens (a combo which i happen to
own
> as well) and shoot a subject at f1.4. The equivalent focal length is 50 x
> 1.6 = 80mm.
>
> Now let's then take a 80mm R Summilux and mount it on a EOS 1v film body
> (again i also own this body), frame the SAME subject and keep the
> composition and subject size EXACTLY THE SAME.
>
> The 2 pictures will look identical because we have kept the subject size /
> magnification and framing the SAME. If u compare the 2 shots, they will
have
> the SAME DOF. This is because the subject distance is constant, and so is
> the aperture.
>
> Remember, DOF is also affected by subject distance! Don't take my word for
> it though - do your own visual tests and find out for yourself :)
>
> The only thing u're right is the difficult of finding lenses to simulate
> your favourite focal lengths. U're right in the sense if u want a TRUE
50mm
> on a DSLR, and nothing but a 50mm, it is impossible to find a 31mm lens
that
> will fit the bill. However, you can use a 35mm lens on the 10D to simulate
> 56mm.
>
> Can you really tell the difference between 56mm and 50mm in actual real
life
> shooting? I don't think so :)
>
> Boon Hwee
>
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In reply to: Message from "bdcolen" <bdcolen@earthlink.net> (RE: [Leica] OT - National Geographic film usage)
Message from Ted Grant <tedgrant@shaw.ca> (Re: [Leica] OT - National Geographic film usage)
Message from "Jim Laurel" <jplaurel@nwlink.com> ([Leica] Digital Aesthetic)
Message from "Red Dawn" <reddawn@singnet.com.sg> (Re: [Leica] Digital Aesthetic)