D**1
发帖数: 1106 | 1 which lens has usm equivalent focusing ? | R***a
发帖数: 41892 | 2 SSM
【在 D**1 的大作中提到】
: which lens has usm equivalent focusing ?
| a***n
发帖数: 1500 | 3 in canon land, usm could mean either ring-type usm or micro motor usm.
that's what i call confusing.
for sony, ring-type = ssm, micro-motor = sam; fairly clearcut isn't it?
【在 D**1 的大作中提到】
: which lens has usm equivalent focusing ?
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