Archived posting to the Leica Users Group, 2001/01/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Perhaps Leica was the only manufacturer to be honest about these things. Was a Nikon 50mm F1.8, actually an F2? I know most other manufactures' 200mm and 300mm lenses are actually nearer to 180mm, and 280mm. Regards, Robert At 01:54 PM 1/8/01 -0500, you wrote: >Jem Kime jotted down the following: > > > As the film industry noted many years ago, F stops are only theoretical > values > > of light transmission not the true values actually obtained. For this > reason > > the professional cine industry works to T stops, (standing for True). I was > > often told in my youth by my father that a Leitz lens of F2.8 would equal a > > lesser lens of F2, at that time I didn't understand but can appreciate > what he > > was trying to say now. > >Then how come incident light meters work with Leica cameras and do not >result in overexposure? > >M. > >-- >Martin Howard | >Visiting Scholar, CSEL, OSU | Shit happens. >email: howard.390@osu.edu | >www: http://mvhoward.i.am/ +---------------------------------------