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PostPosted: Sat Feb 25, 2012 3:17 am 
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1st Qn- I notice that there are some letter behind those lense for example EF - 18mm-55mm, may i know whats EF stands for?

2nd Qn- What does those number means on those different lens like 18mm-55mm,17mm-55mm,100mm-400mm?? :D


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PostPosted: Sat Feb 25, 2012 4:07 am 
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Your second question has a lengthy answer, so Im going to answer instead with a Youtube vid..

The Term you are looking for in FOCAL LENGTH

http://www.youtube.com/watch?v=orbI9-eICBU

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PostPosted: Sat Feb 25, 2012 1:30 pm 
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As for your first question they are the types of lens mount used on canon cameras. Just Google "EF lens EFS lens" and the first link will take you to a wikipedia article that explains what they are.

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PostPosted: Sat Feb 25, 2012 2:04 pm 
in other words: Introduced in 1987, the EF lens mount is the standard lens mount on the Canon EOS family of SLR film and digital cameras. EF stands for "Electro-Focus": automatic focusing on EF lenses is handled by a dedicated electric motor built into the lens.

EF-S lenses are used for APS-C sized Sensors. These sensors are built in the beginners and amateur range of DSLRs.

Full Frame Canon DSLRs are not compatible with EF-S Lenses - you get vignetting on your images.


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PostPosted: Sat Feb 25, 2012 8:24 pm 
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Great, thanks for all of your tips but i have another question.

What is the difference between EF S55-250 IS II lens & Canon EF-S 55-250mm f/4-5.6 IS Lens? Or are they both the same? :shock:


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PostPosted: Sat Feb 25, 2012 8:32 pm 
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I think the EF-s 55-250mm IS II is simply an updated version of the EF-s 55-250mm IS.

"Canon has announced an updated version of its 55-250mm image stabilized telephoto zoom. The EF-S 55-250mm f/4-5.6 IS II is a cosmetically refreshed version of the existing 55-250mm IS, launched in 2008."
http://www.dpreview.com/news/2011/6/13/canon55_200_ISII

So they look different?

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