Originally posted by dadipentak I'm sorry but I'm a busy man and don't have time for an extended read--could you summarize?
I'd be happy to.
The op wanted to know if, conceptually, Sigma HSM is equivalent to Pentax SDM.
I replied in the affirmative, however, the forum does not permit short posts, therefore, in order for my post to be accepted, I had to greatly expand on my initial response. I did so by adding more words, without altering the meaning of my initial reply, which was a simple yes.
The reason I initially went with such a simple, one word response was because it seemed to me that the nature of the original question did not really call for an elaborate response, and I believed that a simple, short answer would be sufficient.
After all, the op didn't ask for a detailed comparison of the exact specifications for HSM and SDM along with similarities, differences, effectiveness of one versus the other, etc. He just wanted to know if the concept was the same.
Which they are.
AFAIK