Re: Some Pentax sales spotted, including 70-200/2.8

And yes the tamron are ring type ultrasonic motors similar to what canon uses. I hope that clears some confusion. The DC motor in my 20-40 is a little poky but it feels solid and reliable. I can't say the same about my 60-250 -- PDML Pentax-Discuss Mail List PDML@pdml.net

Re: Some Pentax sales spotted, including 70-200/2.8

You won't see another lens use the SDM motor that was in the 17-70, 60-250,50-135, 16-50, etc ever again. They revived the branding for the tamron lenses, which frankly was a serious mistake and has led to a lot of confusion. The motors are built by tamron in those lenses and are comparable to the

Re: Some Pentax sales spotted, including 70-200/2.8

Stan, You raised an interesting question. The thought of the ultrasound being heard by some animals/birds had crossed my mind before. I had not got to read about that actual design of the motor until your post nudged me. Prior to that I was somewhat dismissing "ultrasonic" assuming it

Re: Some Pentax sales spotted, including 70-200/2.8 (SDM question)

I went to Wikipedia to see if they could tell me what an ultrasonic motor is, how it works, and whether it can be heard. That last point was my first question actually. Seeing the term “ultrasonic” triggered the thought that the sonic may be “ultra” with respect to human hearing, but maybe

Re: Some Pentax sales spotted, including 70-200/2.8

The HD Pentax D FA* 70-200mmF2.8 ED DC AW doesn't use the same type of SDM micromotors as the DA*-series lenses. Actually it doesn't use SDM at all - but DC motors. Fast, reliable. Last Pentax lens with these SDM micromotors was announced in 2008. Since then we had 3 K-mount "SDM" lenses, all

Re: Some Pentax sales spotted, including 70-200/2.8

Hmmm nice deal. Is this lens one of the ones that has the unreliable SDM focusing mechanism I heard about with the 60-250 or such? On Wed, Jul 27, 2016 at 5:05 PM, Igor PDML-StR wrote: > > Hi All, > > Just in case someone is shopping for lenses... > B has some sale on

Some Pentax sales spotted, including 70-200/2.8

Hi All, Just in case someone is shopping for lenses... B has some sale on Pentax items. I don't know how good all the prices are, - but D FA* 70-200mm/2.8 is only $1696, which is $100 lower than what is was going for (1800). Adorama has the same price for this lens. Here are other sale