Difference in Canon Lenses?

Reply

  #1  
Old 09-27-05, 08:02 AM
Member
Thread Starter
Join Date: Jun 2005
Location: USA
Posts: 278
Difference in Canon Lenses?

I am looking to upgrade digital cameras. I am looking hard at the new 8 megapixel Rebel XT (EOS 350) and the EOS 20D.
It appears they both will take the EF and EF-S series of lenses. I am looking hard at the new EF-S 17-85 MM.
It would give me the combonation of focal lengths I want without having to buy a bunch a lenses later like the old days.
Can anyone explain, in terms I can understand, what the USM is? And what is the primary difference between the EF and EF-S lenses? I must be missing something in reading the material.
 
Sponsored Links
  #2  
Old 09-27-05, 02:28 PM
Member
Join Date: Dec 1999
Location: United States
Posts: 2,535
USM is ultrasonic motor. Its what turns the focusing ring when you use automatic focus. USM is supposed to be very fast and quiet. It uses an ultrasonic frequency vibrations to do the focusing.

The big difference between EF and EF-S? EF lenses will fit into any canon SLR, film or digital. The EF-S lenses are made to fit further into the camera body and can only be used by canon digital SLRs.
 
  #3  
Old 09-27-05, 03:29 PM
Member
Thread Starter
Join Date: Jun 2005
Location: USA
Posts: 278
TNX for the information.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
'