Vic Mortelmans wrote: > Hi, > > OK, obviously I do know that A-lenses have an A-modus, allowing the > camera to set the aperture (shutter-priority modes), while M-lenses > always require the aperture to be set on the lens. > > But being in persuit of a 50mm f/1.4, I notice that the A-model is > priced at least twice as high as the M-model, if not more. > > Looking at the mechanics of the diaphragma, I wonder if an A-lens is > that different, apart from the electronic contact that probably doesn't > do anything more than telling the camera whether the A-mode is on or off. > > And I also assume that the 50mm f/1.4 M and A are optically identical? > > So is there any objective reason for the price difference, or is it just > the game of demand and available quantity that sets the price?
You got the reason in the first paragraph. M and K lenses need the non-standard use system of pressing a button to take a stopdown exposure reading before each shot. A lenses seem to have more plastic parts in them and are alleged to be not built as well as previous series. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
