Please remember one thing, Chris, which is that although lenses are
sometimes designed as (and more often described as) tilt-and-shift lenses,
the two modes are not related, and you do _not_ need a tilt-and-shift lens
to correct converging verticals in-camera. You only need a shift lens, and
the self-appointed gurus on that interweb thingy who throw the
tilt-and-shift terminology around as if to show that they _really_ know what
they are talking about prove only the converse (and they get on my goat!).
But the Pentax offering is strictly shift only - neat lateral thinking
(sorry if that appears to be a poor pun, it wasn't intended - but isn't
poor).
I think you will find that as well as shifting the image circle, you can end
up with a wider wide-angle than you thought you had. I remmeber having such
a discussion with Walt Wayman many years ago, but could not convince him (I
couldn't convince myself either at the time), but having stewed on it, I am
now convinced.
Piers
-----Original Message-----
From: Chris Barker [mailto:ftog@xxxxxxxxxxxxxx]
Sent: 19 April 2013 14:59
To: Olympus Camera Discussion
Subject: Re: [OM] OT: Pentacchio Shifting
Yes. It does warn the user that there might be vignetting with some lenses.
I'll have a play; I don't know much about shift lenses.
Chris
On 19 Apr 2013, at 14:42, Ken Norton <ken@xxxxxxxxxxx> wrote:
>> Very interesting and innovative. I wonder how the image circle of
>> the APS-C lenses holds up to the shift?
>
> The max shift of the IS is supposed to be kept within the image
> circle. Same as 4/3. However, just as with 4/3, you'll see a few
> corner issues once in a while.
>
> However, with legacy full-frame lenses, this all becomes a non-issue.
>
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