Re: Canon Lens's?
- From: "jimkramer" <Newsreader1@xxxxxxxxxxxxxxxxxxx>
- Date: Tue, 3 Mar 2009 07:32:23 -0600
"Keith (Southend)G" <keith_harris9@xxxxxxxxxxx> wrote in message
news:aece2d8e-9b4b-47ac-817d-a91953f7c254@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I wonder if someone could help me here.
I am looking at purchasing a Canon EOS 450D Digital SLR Camera which
comes with a 18-55mm f3.5-5.6 IS Lens, but am chewing over a couple
things. Many years ago I had a trusty Canon A1 with a 28mm, 50mm and
80-200mm Zoom. On the 28mm I often used a Polarising Filter which gave
great results.
A couple of basic questions I guess.
1.What is the difference between an EF and an EF-S Lens?
2.Also in the listings they refer to USM and IS USM, what does this
mean?
3.Polarising Filter(s), Are there different types used for Digital SLR
Cameras, or will the old circular ones still give good results. I
think I once had an issue with the auto light on a Minolta which
rendered the filter useless.
Many thanks
Keith (Southend)
EF lenses will fit on any of the Canon EOS Cameras (Film, Full Frame
Digital, and Cropped Frame Digital.) EF-S lenses will only fit on the 1.6X
Cropped Frame Digital Cameras and I believe there was an APS format film
camera that supported the EF-S lens too.
USM - Ultra Sonic Motor - Faster focusing motors.
IS - Image Stabilization - There is a moveable element in the lens which
will counteract some of the motion blur caused by the camera operator.
Great for hand holding, not so good for tripods, but you can turn the IS
off.
Circular polarizer is still best for the Digital cameras as it preserves the
metering.
-Jim
.
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- From: Keith (Southend)G
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