Questions tagged [canon-ef]

The Electro-Focus (EF) mount has been the standard lens mount for Canon cameras since it's introduction in 1987.

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41
votes
9answers
130k views

What is the difference between EF and EF-S lenses?

This is specific to Canon, but what is the difference between EF and EF-S lenses?
9
votes
3answers
23k views

Why isn't it safe to use EF-S lenses on fullframe?

I've heard that EF-S lenses are not compatible with full frame bodies and that using such lenses could damage the mirror. Are the EF-S lenses not compatible with full frame bodies in terms of "not ...
9
votes
2answers
61k views

What's the difference between Canon EF-S and EF-M?

What is the difference with Canon EF-S and EF-M lens?
4
votes
1answer
247 views

Can removing the lens while pressing the DoF preview button damage the equipment?

I know there's hardly any risk to your equipment when dismounting the lens while the camera is on, but can you damage it if you dismount the lens while the aperture is closed down? With the Canon EOS ...
2
votes
5answers
10k views

Why I can't find an A-mount to Canon EF Adapter?

I looked online for an adapter from A-mount to Canon EF but I couldn't find. The Minolta/Sony A-mount flange focal distance is 44.50mm and Canon EF flang focal distance is 44.00mm, in theory A-mount ...
2
votes
3answers
22k views

Is there a way to use Canon 18-200 EF-s lens on Canon 6D full frame body?

I just purchased Canon 6D (Full frame camera) and I hate to lose the usage of my simple 18-200 EF-S lens. Any idea if there is a technology that allows me to use the lens on the 5d body?