Is the 15-85mm really faster than 18-55 or 18-135?

Started Apr 6, 2013 | Discussions thread
Robert J. Gonzalez
Senior MemberPosts: 1,168Gear list
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Re: Is the 15-85mm really faster than 18-55 or 18-135?
In reply to blue hour, Apr 17, 2013

Love it when people assume everyone know what letters stand for.

What does STM stand for?

blue hour wrote:

Lenses with wider aperture give the cameras

phase detection autofocus unit more light to work with.

Taking that into account all constant f 2.8 zooms

have an advantage.

Watch out:

There is a current 18-135mm STM

thats supposed to be optically better than its older counterpart.

In general STM is quiet and aids live view and video focus in particular.

 Robert J. Gonzalez's gear list:Robert J. Gonzalez's gear list
Canon EOS 50D Canon EOS 7D Canon EF-S 17-85mm f/4-5.6 IS USM Canon EF 70-200mm f/4.0L USM Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) +4 more
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