Archived posting to the Leica Users Group, 2008/03/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Ah, the plot thickens. Thanks Don. Actually, I think f/1.7 is a half stop down from f/2, but point taken. What complicates matters is that there were three versions of the OM 50/1.4: The oldest singlecoated (and often silvernosed) lenses with yellow coating, the intermediate multicoated version, and the last version with a serial number of 1,050,000 or greater. Do you know which one "Modern" tested? I've tried all three. I got rid of the first version after a couple of rolls. I still have the second and third versions. The third version is much better wide open (less coma, sharper). I don't recall any exposure difference, I think they both showed little more light between f/2 and f/1.4. Anyway, the bottom line is that with fast manual OM lenses on E-series cameras, the very widest and narrowest stop may require a custom +/- EV. And you can't trust your in-camera meter at the extreme stops, either. I found the 50/1.4 occasionally useful on the E-1, but I usually kept it set at f/2, where it performed nicely indoors. --Peter At 09:23 AM 3/5/2008 -0800, Don Dory wrote: >Peter, >When Modern Photography tested the Zuiko 50 F1.4 lo these many years ago >they determined that it was closer to a 1.7is lens than a 1.4 in actual >transmission or T stop. Therefore when the experiment is run you will in >fact find not much difference in exposure from a marked F2 to F1.4 as the >lens does not transmit but 1/3 stop more light.