Originally posted by jcdoss I've been shopping under the assumption that A lenses were, in most if not all cases, equivalent to M lenses except for the A setting. The lens dimensions, weights, and optical formulas all look the same to me for lenses of similar spec. Is this assumption correct? I've been acquiring some M lenses (no photos to prove it yet, though!), but I wonder if there are some A's that I should be searching for?
Cheers!
JCD
They're mostly the same but not all. Have a look at the reviews section.
As are rarer and easier to use and hence command a higher price. Ms are more common but much better built. I find I enjoy fully manual lenses more, but of course that depends on having enough time to focus and get the exposure right, a more relaxing (and fulfilling) type of photography.
The only A that is quite common is the 50mm f/1.7, which is optically the same as the M version, ie superb. However, as all A lenses, it has the advantage of being able to stop down in smaller increments. I find the Pentax 50mm f/1.7 lenses start to perform really well at f/2.2, which you can't reach on the M, but you can on the A and FA.
Keep an eye out for anything. If you find it, check the price is reasonable and buy it. Compare it to other similar lenses you already have, and if you don't like it then as it's already second-hand, you should be able to sell it without making a loss.