DA70 and 24x36 coverage

[Tom C]

Sure it's bad.  Think of how many people might buy a lens and never realize 
that a significant portion of the light passing through reaches the focal 
plane 'off-sensor' and is not recorded.  Totally wasteful. :-)

Tom C.


>From: "P. J. Alling" <webster26 at mindspring.com>
>Reply-To: Pentax-Discuss Mail List <pdml at pdml.net>
>To: Pentax-Discuss Mail List <pdml at pdml.net>
>Subject: Re: DA70 and 24x36 coverage
>Date: Mon, 01 Oct 2007 18:52:22 -0400
>
>No it's not bad. DA lenses are guaranteed to cover 16x24 but may cover a
>larger format. That's the only guaranteed there is. It hurts nothing if
>they cover a larger format.
>
>J. C. O'Connell wrote:
> > If the comments below are true, it's bad. The lens designation
> > should convey if a lens wont cover 24x36mm IMHO. A APS-C only
> > lens is not the same thing as a 24x36 lens and there should be
> > an easy way to know by the lens designation IMHO.
> > jco
> >
> > -----Original Message-----
> > From: pdml-bounces at pdml.net [mailto:pdml-bounces at pdml.net] On Behalf Of
> > Godfrey DiGiorgi
> > Sent: Monday, October 01, 2007 3:37 PM
> > To: Pentax-Discuss Mail List
> > Subject: Re: DA70 and 24x36 coverage
> >
> >
> > On Oct 1, 2007, at 11:46 AM, Boris Liberman wrote:
> >
> >> I am asking my question mainly because if it indeed covered full frame
> >>
> >
> >
> >> and there were no image deterioration past the APC frame, Pentax
> >> probably would have given it FDA designation instead of DA.
> >>
> >
> > The D-FA mount includes an aperture ring control. DA lenses do not.
> >
> > The DA70 has no aperture ring control, it was design for use with the
> > digital SLR bodies. Whether it actually covers 24x36 mm format isn't
> > really relevant to the mount designation.
> >
> > Godfrey
> >
> > ---
> > Not really relevant but interesting:
> >
> > In the course of researching my latest lens acquisition, I saw an
> > article about someone who took an M42 mount Pentax Fish-Eye-Takumar
> > 17mm lens and cobbled up a mount to fit it on a 6x6 rollfilm folder
> > with behind-lens leaf shutter. His goal was to make circular fish eye
> > images inexpensively ... it produced an image circle ~ 45mm in
> > diameter on the 6x6 format film, which suited his needs perfectly.
> > ---
> >
> >
> >
> >
> >
>
>
>--
>Remember, it’s pillage then burn.
>
>
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