On 30 Dec 2015, at 21:19, Donald Guthrie <[email protected]> wrote: > > As rumors of a Full Frame camera are getting closer to fruition, I wondered > how my pentax mount glass would work. Borrow Lenses offered me 17 days for a > 7 day rental price over the holidays. So I rented a Sony A7II. My full frame > lens collection consisted of Pentax 28mm, 28-70 & 70-200 Tamrons, a 50mm > Pentax 42 screw mount Sears labeled 50mm, A Tokina 70 to 200, a Sigma 28mm > and Rokinon 14 mm. These photos are the results of my shooting. I did not > take notes on which lenses I used for the pix and of course the exif is no > help. If there is a specific one of the above lenses you want me to test, let > me know and I will post that one. Most are non or slightly cropped except the > one of all colored glass which is maybe a 90-100% crop. Used a $15 adaptor. I > had no Sony native lenses to use. > > My general impression of FF is nice bokeh and low noise even even after > pulling the shadows up from black. The biggest surprise for me was how wide a > 28mm is and how short a 200 mm is.
I guess from that that you've only ever shot digital! > > Here are the links to two sets; would be happy to get your opinion on the > photos and to answer any questions you might have. > > > http://adobe.ly/1TqeEeb > > And a second one on an afternoon in a Botanical Center with butterflys & > Plants. . > > http://adobe.ly/1MyGuit > They're nice photos, well composed and well lit. When I moved from film to digital I had a very high quality Contax / Zeiss film kit. Using the lenses with an adapter on Olympus 4/3rds gear I noticed very significant purple fringing with some of the lenses, which meant they were effectively useless for digital, so I sold all the Contax / Zeiss stuff. So the first thing I looked for on your shots was purple fringing because I think (could be wrong) that it results from the different alignment of pixels and film wrt the light path, and subsequent interference between pixels. I didn't notice any in the shots of yours that I looked at. What I did notice is that at full magnification your shots are softer than the quality of your photography deserves. You don't say specifically which models of lenses you use, but I suspect the softness is in the glass, not including the fullness of the frame. You should try and get hold of two or three equivalent focal length Sony lenses and shoot comparisons with your lenses under controlled conditions, as best you can. Your pictures deserve better lenses. Go for quality rather than quantity. B -- 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.
