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And Tamron seems to be introducing lenses with linear motors, because Sony owns a stake in Tamron? I don't think Tamron has much experience historically with audio equipment. Fuji has quite a few lenses now with linear motors as well.
Hard to believe that it's just based on familiarity with linear motors....I mean they have moved TO linear motors with lenses, they didn't start there.
I'm not sure how to prove/disprove your theory/hypothesis though. I don't see where rotation buys you much when moving lens groups, linear does seem well suited to that activity (other than needed more motors to get the torque.) So I started looking at broader benefits of the different types, not specific to lenses. In theory, broader based benefits of one type of a motor vs another should be informative in the context of use within lenses.
I mean if we can't trust Sony (or any manufacturer) when they list benefits, and we can't trust anyone reviewing those lenses (under the theory they are just parroting the manufacturers), and we can't compare lenses, because maybe a manufacturer chose to make their stepper based lens slower (and the one using linear motors chose to make it faster.) How can we prove or disprove anything in terms of use within lenses?
Your theory is based on speculation. I'm not saying it's not founded in some sort of logic, but I don't why we should trust you more than the other sources noted.
I guess it's a mystery, since no valid inferences can be made.
Steve Spencer wrote:
Tim, one thing more to know about both linear motors and stepper motors is that they are both old technology borrowed for mirrorless because they have 5 features in common: 1) they are very quiet (this is very useful for video); 2) they are very precise (great for focus accuracy) 3) they are small (small is a goal of many mirrorless systems); 4) it is relatively easy to use more than one motor and coordinate these multiple motors; 5) they are fast (obviously speed is a good thing for focus). Stepper motors were used most extensively in the past is clocks and they rotate, which most lenses have done for focussing for decades. Linear motor were used most extensively in speakers before being used in camera lenses, and do not rotate. I suspect, but have no way of knowing that Sony uses linear motors because they have extensive experience with linear motors in speakers (they did make audio equipment for a long time after all). There may not be clear tangible benefits, but rather Sony may be simply using a technology they know well that other companies do not know well. ...Show more →
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