alexandru_cristian_sarbu

<p>The "SDM" from the D-FA 15-30 f/2.8 and the D-FA 24-70 f/2.8 is Tamron's USD ring-type motor (and on the 18-270 there should be the corresponding consumer Tamron motor).<br> Why it's called "SDM"? Because it's an "ultrasonic" piezo motor, just like on the DA*s. Besides that, the motor in these two D FAs has nothing to do with the tiny micromotor from the DA*s.<br> It's the same as with Canon, where USM is used to denote from the smallest (DA*-like) micromotor to ring-type motors found in their top lenses.</p>

<p>The "boundary box" aka the cropping frame, the spot metering frame, AF point markings, grid display markings, AF frame markings and electronic level indicators are displayed via a transparent LCD overlay, and they can be disabled.<br> The "boundary box" aka the cropping frame itself won't appear unless you're shooting in the crop mode. So it cannot cover your subject's eyes - assuming that you like to have your subject into the frame, not outside it.</p>

<p>Paul, just a minor detail: both the K20D and the K-7 had 14MP Samsung sensors (slightly different versions, due to the introduction of video in the K-7). Otherwise as you say, all other Pentax DSLRs used Sony sensors.<br> Which is nothing special - it makes no sense and is actually not possible to make everything in house.</p>