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Finally got my 75-300mm EF III! What do you do with yours? - Page 2

post #11 of 14
Quote:
Originally Posted by rx7speed;12589385 
gonetomorroow? the USM 7x-300 lenses though aren't they just about as fast as a norma micro motor lens as they are not "true" usm though? I don't know never owned one so I can't say but I thought that they where still fairly slow for focusing.

As far as I know, the 70-300mm is ring USM, not micromotor USM, so they should be faster than normal motors.

That said, conditions matter too. My 28mm f/1.8 USM is faster than a normal AF motor in low light, but it still is much slower than it normally is under normal lighting conditions.
post #12 of 14
Quote:
Originally Posted by rx7speed View Post
gonetomorroow? the USM 7x-300 lenses though aren't they just about as fast as a norma micro motor lens as they are not "true" usm though? I don't know never owned one so I can't say but I thought that they where still fairly slow for focusing.
That's right, they don't have ring-type USM like higher grade Canon lenses, but the "USM micro motor," which, according photozone.de reviews, is still fast and silent but not as fast as ring-type USM. They don't seem to say anywhere how much faster the micro-USM motor is than the normal micro motor.

I have the Canon 50/1.4 USM (which has the USM micro motor) and briefly owned the Canon 50/1.8 at the same time, and the AF speed and accuracy on the 50/1.4 definitely seemed much better and quieter. However, the 50/1.8 still seemed to focus reasonably fast owing to its simple design, but it tended to hunt more in low light. The Canon 18-55 seemed to focus even more slowly by comparison, so I suppose that the non-USM micro motor speed is dependent in part on the lens design.

Quote:
Originally Posted by r31ncarnat3d View Post
As far as I know, the 70-300mm is ring USM, not micromotor USM, so they should be faster than normal motors.

That said, conditions matter too. My 28mm f/1.8 USM is faster than a normal AF motor in low light, but it still is much slower than it normally is under normal lighting conditions.
Check the photozone link above. Both the 75-300 and 70-300 have USM micro motors and not ring-type.
Edited by GoneTomorrow - 3/2/11 at 7:02pm
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post #13 of 14
agreed with design of lens makes a big part. the 50 1.8 using it's cheap motor was still fairly quick to me and MUCH quicker then the 18-55. but then again simple design, little glass to move, and a fairly short throw should make for fairly quick focus.

still torn on if I should buy another one lol but I'm a bit unhappy with canon at the moment anyway.
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post #14 of 14
When I first say the header to this thread ("Finally got my 75-300mm EF III! What do you do with yours?")
I was thinking: I make Julienne fries with mine (old, late night infomercials). Sorry, bad joke.
The range is fine for local wildlife, zoos, some travel work, etc. How close does that one focus? It might pinch hit at a macro.
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