>and this increases the size of the image circle ... decreases...
Bulent --------------------------------------------------------------------- http://patoloji.gen.tr http://celasun.wordpress.com/ http://www.flickr.com/photos/bc_the_path/ http://photo.net/photodb/user?user_id=2226822 http://www.pentaxphotogallery.com/artists/bulentcelasun 2016-07-07 15:10 GMT+03:00 Bill <[email protected]>: > On 7/7/2016 5:28 AM, Zos Xavius wrote: >> >> I bet its like the 60-250 and there is just a baffle inside to block >> light for aps-c. > > > That is typical behavior for lenses in general. Close focusing moves the > glass farther away from the sensor, and this increases the size of the image > circle. > Anyone who has used a large format camera will be familiar with this. > > bill > >> >> On Wed, Jul 6, 2016 at 6:24 PM, Larry Colen <[email protected]> wrote: >>> >>> I just did a quick test with the DA35 on the K-1 to see at which aperture >>> vignetting becomes a problem. The short answer is that aperture doesn't >>> make much difference, focus distance does. If you are focused to less >>> than >>> about 20cm/8" the lens will not vignette. Further away than that, and >>> something occludes the corners of the sensor. >>> >>> That explains why when I tested it, which it turns out to have been with >>> macro shots, I didn't see any vignetting, but when I used it to >>> photograph >>> the sushi, I did. >>> >>> -- >>> Larry Colen [email protected] (postbox on min4est) http://red4est.com/lrc >>> >>> >>> -- >>> 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. -- 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.
