Well, I'm pretty sure it's at least 75mm in diameter :-) Seriously, though, it depends very much on the lens. And even then it's not necessarily a hard-and-fast boundary; image quality generally tails off as you get to the edges.
Unfortunately it's usually the shorter focal lengths that are most subject to image circle limitations, and those tend to be the lenses where shift would be most useful. On Wed, May 20, 2009 at 09:02:40PM -0500, Nick Wright wrote: > Sure, do we know how large the image circle of a typical FA645 lens is? > > On Wed, May 20, 2009 at 8:56 PM, John Francis <[email protected]> wrote: > > On Wed, May 20, 2009 at 08:49:54PM -0500, Nick Wright wrote: > >> 8-11mm isn't a terrible lot of movement. > >> > >> I wonder how difficult it would be to implement a sensor shift of that > >> magnitude in say a medium format digital body? > >> > >> Can you imagine that? It wouldn't give you tilt control (but perhaps > >> that wouldn't be that hard to put in either?) but just think being > >> able to apply shift to any lens you put on the body? > > > > That only works if the image circle of the lens is large enough, > > otherwise you're going to have serious vignetting problems. > > > > TANSTAAFL. > > > > > > -- > > PDML Pentax-Discuss Mail List > > [email protected] > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > to UNSUBSCRIBE from the PDML, please visit the link directly above and > > follow the directions. > > > > > > -- > ~Nick David Wright > http://www.nickdavidwright.com/ > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
