Tue Sep 25 22:48:50 EDT 2012 Joseph McAllister wrote: > I have the far inferior FA-J 75-300 that came with a FF body last > year. FF Coverage, of course. I was surprised that it took pretty damn > good pictures on the K-5. Another of course is that it is only using > the center of the image, so the best it can give for DA size. It's > essentially a 105-450mm f3.5-5.6 (or thereabouts)
Joseph, it is incorrect. There is no "equivalent" aperture of the lens for a different crop factor if you are talking about the lens ability to let the light through (aka lens "speed"). So, each point of the APS sensor will get the same amount of light as any point on a FF sensor. What is affected by the sensor size is DOF (depth of field). On Sep 25, 2012, at 08:31 , Bong Manayon wrote: > Delurking... > > For the full frame monger: I used a DA 35/2.4 AL & a DA 55-300/4-5.8 > ED on a film camera (MZ-3+Ilford XP-2). > > http://www.flickr.com/photos/bongmanayon/sets/72157631620661628/ Nice set of images, and thanks for reporting that these two lenses can be used on a FF without noticeable image degradation. I remember seeing some webpage (or was it somebody's post on PDML?) that listed a bunch of DA lenses, mentioning which ones are fully or mostly compatible with FF bodies, despite the "DA" designation. Igor -- 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.
