But none of them are wide enough to replace even this zoom, let alone
the 12-24. For those of us who must shoot wide, there are few options.
(BTW, the A 15 distorts a lot more than the DA* 16-50 at 16mm or the
DA12-24 @ 12 mm.
Paul
On Nov 9, 2008, at 4:12 PM, JC OConnell wrote:
I would like to add that this subject is one of the things I like
about using FF zoom lenses on APS digital format. Whatever the
original FF lens distortion was, its reduced by 1/3 on the APS
format because you're only using the central portion of the designed
FF image circle. In other words, FF zooms get better with respect
to distortion when used on APS format, this is a GOOD thing especially
if the original FF zoom was already good to begin with.
JC O'Connell
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of
Margus Männik
Sent: Sunday, November 09, 2008 4:06 PM
To: Pentax-Discuss Mail List
Subject: Re: DA* 16-50 review at photozone
Hi,
I divide geometrical distortions to good and bad not by percentage,
but
how even it is. If the distortion is even, resulting arches can be
easily transformed back to straight lines. I have analyzed several
wide-angle zooms and many of 'em bend straight lines to complex curves
that are nearly impossible to "straighten". Those lenses often measure
quite OK (i.e. distortion result as percentage in Imatest is rather
low), but there's no software that could effectively correct the
image.
Pentax DA* 16-50mm distorts quite "good", especially at wide end.
BR, Margus
JC OConnell wrote:
I would say it depends on what you mostly use it for,
The geometric distortion would be very bad/annoying for Horizons and
anything else that is supposed to Be straight, like buildings. Of
course you Could correct in a photoshop add-on for occasional
Usage like that, but if you used it all day
For linear things that's a pain in the arse
To have to do photoshop corrections...
JC O'Connell
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of [EMAIL PROTECTED]
Sent: Sunday, November 09, 2008 2:37 PM
To: Pentax-Discuss Mail List
Subject: Re: DA* 16-50 review at photozone
Then you'l be missing out on a very fine lens. Certainly one of the
best zooms Pentax has ever produced. And I'd be surprised if it's not
a lot better than the 17-70. Paul
-------------- Original message ----------------------
From: Boris Liberman <[EMAIL PROTECTED]>
Let's just say that either measured or shown by example, the
distortion
at wide end makes this lens a no-go for me.
Boris
Subash wrote:
http://www.photozone.de/pentax/405-pentax_1650_28
<quote>
Verdict
It is difficult to find a final verdict for the Pentax SMC DA*
16-50mm f/2.8 ED [IF] SDM. On the one hand it has some obvious
problems like a weak border performance at max. aperture and very
pronounced lateral chromatic aberrations (CAs). On the other hand
it
is really very sharp and contrasty at medium aperture settings
(f/5.6-8) and many users may actually forgive the border problems
at
f/2.8 because you either stop down for conventional photography or
rely on the (very sharp) center for shallow depth-of-field
situations (e.g. portraits) anyway. The build quality of the lens
is
also a step up from the consumer grade Pentax lenses and the silent
(although not overly speedy) SDM is an extra bonus on top. The
pricing of the Pentax 16-50mm f/2.8 is fair relative to its
performance and build quality.
</quote>
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