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I have a Canon Rebel T3i. I have the standard lens. I am looking to buy a telephoto lens that won't break the bank! I am looking at a Canon 55-250 telephoto lens. Is this a good quality lens,and will it fit the T3i?

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Will it Fit -> Yes –  Vivek Jan 10 at 19:01
    
possible duplicate of What is the difference between EF and EF-S lenses? –  mattdm Jan 10 at 19:13
    
@mattdm - while that is part of the answer, it doesn't cover if all EF lenses will fit on all Canon bodies specifically. –  AJ Henderson Jan 10 at 19:25
    
Need the title to match the question: are you asking about the 55-250 or do you want to ask the more general question implied by the title? –  MikeW Jan 11 at 20:38

3 Answers 3

For fit: Short answer: YES. Longer answer: Each camera has a type of mount and is part of its specifications. All modern Rebels (yours included), XXD (60D/70D/etc), and 7D cameras are EF-S mounts. Full frame cameras, such as the 1D/5D/6D series use the EF mount. The EOS-M uses the EF-M mount. An EF-S mount camera can use an EF or EF-S lens, but an EF mount camera can only use an EF lens. EF-M lenses can only be used on the EOS-M mount, but (with an adapter) an EF-M mount can use EF and EF-S lenses. As others have pointed out, there are some older mounts that have limited or no compatibility.

For quality: you get what you pay for. It is the cheapest lens I can think of for its range and comes with trade-offs. The aperture is not as wide as others, isn't as sharp, but is cheaper and more lightweight than any other lens like it. For a beginner, it's not a bad way to go.

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What about EF-M lenses? –  Imre Jan 10 at 20:14
    
@Imre You're right. Edited to include it. –  tenmiles Jan 10 at 20:22

Answering the title: no! As others wrote, EF and EF-S lenses will fit the crop-sensor DSLRs; only EF will fit the full-frame DSLRs.

Here's the "no" part: older manual focus lenses use the FD mount, which will not fit on Canon's autofocus cameras; only the manual focus cameras.

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On a aps-c camera ef and ef-s lenses will fit. Vintage FD lenses can be put on with a passive adapter for macro work. However, to focus to infinity yo need an adapter with a lens and that type of conversion is not a good idea.

On a full frame camera ef lenses will fit. FD might work, but FF cameras often have physical trouble with the mirror action with vintage converted lenses.

On a EF-M camera you can use EF-M lenses and ef and efs with adapter. you can even get an official canon adapter. EF-M lenses doesnt convert well to ef and efs - it would need the lens type (havent seen them around either).

Ef and efs on FD camera with adapter (without lens) should be possible, but since they have no manual aperture ring there isnt a market for it.

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you know you are getting old when the FD lenses on your first (proper) camera are referred to as "vintage"... –  dav1dsm1th Jan 10 at 20:57

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