Archived posting to the Leica Users Group, 1999/03/28
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Robert G. Stevens wrote: > The advantage of ROM over non ROM lenses when used on the R8 is that the > lens sends info to the camera regarding how far it has stopped down prior > to the shutter firing. For example, when the R8 motor arrives and you are > shooting at say F16, the camera will adjust the exposure accordingly if the > aperture say only got closed to say f12.5 when using a high framing rate. Robert, Are you sure ? It is the first time that I read something like that. In the 7/98 issue of Leica Fotographie on pages 30 and 31, there is paper about the purposes of the electric contacts found on the ROM Leica lenses and inside the R8. They say that small lenses with ROM permit shorter time parallax or that the effective aperture (mesured at the factory and stored into ROM) is taken to account. At the end of manufacture, or when retrofitting of older lenses, every Leica-R lens is individually measured and programmed in order to make sure that the potential accuracy of the exposure metering is maintained. Lucien