Vic, Late reply, but here's my take. The A 50mm lens can be used fully automatic on DSLR's. The M's require you to press the green button to measure exposures. Makes the A easier and faster to use. Simple as that... Regards, Bob S.
On 6/24/07, Vic Mortelmans <[EMAIL PROTECTED]> 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? > > Groeten, > Vic > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
