On 4 Oct 2003 at 12:18, Tom Pfeiffer wrote:
>
> ----- Original Message -----
> From: "Willem-Jan Markerink" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Saturday, October 04, 2003 10:07 AM
> Subject: Re: Re: EOS OT New Sigma 12-24
>
>
> > On 3 Oct 2003 at 23:44, Tom Pfeiffer wrote:
> >
> > > The article says it's HSM, although the title doesn't. Gel filters
> > > seem ok, ANYTHING would likely vignette on the front of a 12mm,
> >
> > But *not* with a 17mm on a full-size frame....that's 104
> > degrees....while 12mm on a non-full-size frame is only equivalent to
> > 20mm, or 94 degrees....and not even a 14mm accepts front filters.
> >
>
> True, but I'd hope to use this on my EOS 3 as well, where it IS a
> 12mm.
>
> :)
True, just as tempting as a 14mm, but that's a much less useful
application than with a half-size chip (where you need it to get into
decent wide-angle territory).
As fullframe, such extreme angles *can* be fun, but not without the
necessary image detail....a 24x36mm frame is just not large enough to
show much detail, at least not with such a huge angle of view (hence
a very low subject magnification)....
Without a *very* strong (almost exclusive) focus on composition with
strong lines, you nearly always end up with a boring/dull
image....only extreme foreground elements can spice things up as an
alternative, but hardly ever without a lot of (color) contrast
either.
Even the 12mm Heliar, with its optimum classic/non-retrofocus design,
isn't good at this subject detail....
The real problem is that increasing subject detail with such extreme
angles means 4x5" equipment, with a 35mm Rodenstock lens (and even
then only 6x12cm, not the full 4x5")....and you still don't get a
linear quality increase with the larger size.
But you can at least tilt & shift then....:))
A much more efficient alternative is a swing-lens panorama
camera....with a optimum lens, designed for 6x4.5cm at most, you can
get 6x12, 6x17 and even 6x24cm images.
Just not good for inside architecture, or getting too close in case
of outdoor architecture.
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<[EMAIL PROTECTED]>
[note: 'a-one' & 'en-el'!]
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