Topic: Let's talk Canon digital SLRs...

[stirinthesauce]

Chris -

Excuse my n00bness to the wonderful world of digital slr's, but what is the difference between USM and EF lenses?

[eric.B]

Chris -

Excuse my n00bness to the wonderful world of digital slr's, but what is the difference between USM and EF lenses?

I might be wrong, but all lenses made by canon are either "ef" or "ef-s"..  The "usm" stands for "ultrasonic motor" which is the technology for their auto focus system.  Some lenses have it, some do not.  It is supposedly faster and quieter than their other auto focus motor systems. 

for instance.. here is the description of the EF 75-300mm f/4-5.6 III from Canon's webpage...

 ""The optical system, construction, and exterior are the same as the EF 75-300 mm f/4-5.6 III USM’s. The difference is that it uses a DC motor instead of a USM to drive the AF.""

as opposed to the EF 75-300mm f/4-5.6 III USM, which has this........

"" Compact and lightweight 4x telephoto zoom lens ideal for shooting sports, portraits, and wildlife. The newly developed Micro USM makes autofocusing quicker and quieter. The improved zoom mechanism also makes zooming smoother. The front part of the zoom ring now sports a silver ring for a luxury touch."""

I hope this helps!!

[stirinthesauce]

+t eric, that explains it for me 

[BayTaynt3d]

Chris -

Excuse my n00bness to the wonderful world of digital slr's, but what is the difference between USM and EF lenses?

I might be wrong, but all lenses made by canon are either "ef" or "ef-s"..  The "usm" stands for "ultrasonic motor" which is the technology for their auto focus system.  Some lenses have it, some do not.  It is supposedly faster and quieter than their other auto focus motor systems. 

for instance.. here is the description of the EF 75-300mm f/4-5.6 III from Canon's webpage...

 ""The optical system, construction, and exterior are the same as the EF 75-300 mm f/4-5.6 III USM’s. The difference is that it uses a DC motor instead of a USM to drive the AF.""

as opposed to the EF 75-300mm f/4-5.6 III USM, which has this........

"" Compact and lightweight 4x telephoto zoom lens ideal for shooting sports, portraits, and wildlife. The newly developed Micro USM makes autofocusing quicker and quieter. The improved zoom mechanism also makes zooming smoother. The front part of the zoom ring now sports a silver ring for a luxury touch."""

I hope this helps!!

And...

EF-S = Only work on cropped canon digital bodies (XT/XTi/30d/20d/etc.)
EF = Work on all canon digital and film bodies

[bhtoque]

So is the XTi worth the $150-$180 over the XT???

I'll really only be using it at shows and festivals.

Is there a specific lense recomended for low light (concert) shooting??

Thanks,

JAson

[Ryan Sims]

Finally pulled the trigger yesterday. 

[stirinthesauce]

+t

Your gonna love it 

Now, for me to get a zoom lens 

[rmouk]

Great shots!  Where were they taken?  I spend a lot of time in KY, TN, NC, and that looks familiar but I can't quite place it.

diggin my xt

Here are a few I shot the other day with the kit lens, 18-55 that came with it.  Not a bad lens for daytime shooting.

[rreidiii]

USM stands for ultra sonic motor this is what makes the auto focus...auto focus. Apparently it is much quieter than older motors.

[Ryan Sims]

Camera arrived at work at lunch!  WOOOOOOOOOOOO

[stirinthesauce]

Great shots!  Where were they taken?  I spend a lot of time in KY, TN, NC, and that looks familiar but I can't quite place it.

diggin my xt

Here are a few I shot the other day with the kit lens, 18-55 that came with it.  Not a bad lens for daytime shooting.

Shots were taken out at Stone Door at Savage Gulf State Park in Grundy County, Tennessee.

[Ryan Sims]

I need A LOT more practice with manual focus with the thrifty fifty.  Here are the best from my first time out last night.  These three are from the University of Kentucky campus.

[bhtoque]

Here's to being at the right place at the right time

I just picked up a canon 75-300mm f4-5.6 IS USM used, but mint for $369 at a local shop.

Going to give it a workout tomorrow and Sunday festi shooting.

JAson

[eric.B]

the 10-22mm efs saves the day again!

[stirinthesauce]

+t!  that pic is awesome