On 1/9/06, Paul Stenquist, discombobulated, unleashed: >You're missing the fact that you can get much better autofocus >performance with a motor in the lens. This is extremely valuable for >any type of action photography, be it birds or baseball. I will at >least buy that 50/135/2.8 if it's USM. I'm sure it would be my most >used lens for many things. I would also by a 400 with USM if it's >offered, and I can afford it. Coupled with image stabilization, these >lenses will be capable of truly great things. I'm excited about this.
Paul is right. Make sure you understand what type of motor a USM is. (In fact Pentax will probably call the system SSM - I'm guessing - as USM is used by Canon, HSM by Sigma, etc). I have used Canon USM lenses for several years now and the focus is fast and almost completely silent. Certainly, outside on a street with the odd car, you will not hear it all. When I use my wife's *ist Ds, it startles me by comparison. Tech-heads will explain much better than me how such lenses work, but they *can* break. Here's a taster of what one looks like when taken apart to be inspected: <http://www.photoscene.com/sw/tour/inside.htm> -- Cheers, Cotty ___/\__ || (O) | People, Places, Pastiche ||=====| http://www.cottysnaps.com _____________________________ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
