can any users of the Phase /Schneider LS lenses give some feedback?
are they optically any better at wider apertures - like f4.0 ?
anyone used the 110mm - although I dont think its officially released yet.
Capture Integration were promising some comparative tests, but nothing has appeared.
Indeed. I found it excruciatingly hard to compare wide open performance for real-world items (e.g. not a test chart) because at f/2.8 the critical DOF is just so freaking small and the only thing that's going to vary in a meaningful way is the corners since the center performance of the 80mm D f/2.8 is very sharp (80mm D corner performance is excellent all-things-considered, but falls off enough that in theory it could be improved).
I personally ran a test over Christmas weekend and despite very careful technique, over-sized tripod, tethered capture to a 30" monitor I could not produce (in my two hour slot I had that night) two shots which matched focused on all four corners and center between the two lenses. Literally a mm of subject movement, a difference in focus distance of a mm, a fraction of a degree of rotation, meant enough of a difference to make direct comparison irrelevant.
Also there was a difference in the renderings of both in and out of focus elements such that even equally sharp parts of the image looked slightly different.
If you're interested we would gladly rent you a Schneider 80mm D LS and if you decide to purchase we'd credit the rental 100% (within the first week) to the purchase. And of course anyone is welcome to come to our studios in Miami and Atlanta to do their own testing - we'll help you as much or as little as you want.
THE feature of the Schneider lenses is the leaf shutter (1/1600 sec flash sync, different bokeh, slightly less shutter bounce 1/8th and 1/30th). My conclusion from the imperfect data was the 80mm Schneider was indeed moderately sharper, but not in a blow-your-mind kind of way and probably not a reason to upgrade if that was your
only goal unless you are the type that simply always wants the very best. Also, by f/5.6 I saw zero difference.
The 55mm LS I expect a much larger difference as the 55mm non D Mamiya lens is not the sharpest lens in the lineup and it seems very likely the Schneider will be a significant improvement. The Schneider 110mm will very probably not be drastically sharper than the Phase One 120mm D Macro lens (since the 120mm D Macro is very very sharp), but adding autofocus (the 120mm D Macro is manual focus only) and a leaf-shutter to a lens at that focal length will be a very very welcome addition to the lens lineup.
Doug Peterson
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