On Jun 28, 2006, at 8:22 AM, Jens Bladt wrote: > Identical does not exist. > Even two lenses from the same production series can show small > differences. ...
Trying to argue a case on unit variations is silly. Unit variations are obviously embedded in any production of multiple units. My use of the word "identical" is simply an emphatic way of saying that the lenses are as like as a production run of optics can be. Variations in lens performance in the 1-5% range is not visible in the output unless your purpose is to record test targets and evaluate lines per mm captured. The difference between these lenses is the design of the mount. If I printed an equally well exposed and rendered 13x19 inch print from each of them, you would not be able to tell them apart unless the scenes printed were specifically those that exaggerate the different qualities of the f/1.4 vs f/1.7 designs in out of focus rendering. Godfrehy -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
