Archived posting to the Leica Users Group, 1999/09/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]My findings are, as a result of years of bracketing, even with Velvia, a film that does not tolerate over or under exposure, that 1/8th stop is, basically, meaningless. You will find manufacturers that would have called it an f/4 lens, just as the inscribed focal length of a lens is rarely the real focal length. Some of the Nikon lenses are way off. Even a 1/4 stop is marginally recognizable, a little more for 1/3 stop. My R4sP has 1/3 stop bracketing control. When bracketing, I use two clicks (2/3 stop) between frames. This is still quite close. Even with Velvia. I would just read it as f/4.0 and call it a day. Jim At 06:03 PM 9/6/99 -0300, Robert G. Stevens wrote: >Jim: > >What does one do with 1/8th of a stop? Would a lesser manufacture just >called it an F4 lens? Does an eith of a stop show on chromes? In other >words, should I just use the incident reading for F4 when shooting wide open? > >Regards, > >Robert > >At 12:26 PM 9/6/99 -0700, you wrote: >>At 03:35 PM 9/6/99 -0300, Robert G. Stevens wrote: >>>Speaking of half shutter speeds and the such, how do you use a manual meter >>>when shooting the 105-280 wide open at F4.2? I have just been stopping it >>>down the half stop between 4.2 and 5.6 ( 4.8?) and using that for the >>>manual meter. >>> >>>How much slower in stops is 4.2 from 4? >>> >>>Regards, >>> >>>Robert >> >> >>It goes, in 1/4 stops, f/4.0, f/4.4, f/4.7, f/5.2, f/5.6 >> >>and in 1/3 stops: f/4.0, f/4.5, f/5.0, f/5.6 >> >>so you can find f/4.2 as roughly 1/8th stop slower than f/4.0 >> >>Jim >> >> >