One does not control or determine the other,Īll lenses with the same focal length render objects the same size. The desired focal length and coverage are independent, and are both fully under control of the lens designer. The size of objects in the image created by the lens is determined solely by the lens’s focal, and has nothing to do with its coverage. In general, the image circle is slightly larger than the diagonal of the image frame (film or sensor). It isn’t.Ī lens’s coverage (that is, the size of its image circle) has nothing whatever to do with its focal length. You are all trying to make something simple complicated. I learned it 50 years ago in a book by Andreas Feininger. This is Photography 101, and should be explained in any good book on photography. It is not affected by anything other than the focal length and the distance from the subject. If I photograph a subject at (say) 3m with an 85mm lens on any camera, of any format, the linear size of the image at the film plane will be the same. The one thing that remains the same is the //linear image size//. An 85mm lens for 4×5 view camera will record a much wider angle of view than an 85mm lens for a APS-C sensor.
The lens’s //angle of view// is determined by the format. An 85mm lens for 4×5 view camera covers a much larger area at the film plane than an 85mm lens designed for a APS-C sensor.ģ. The lens’s //coverage// is determined by its optical design. All 85mm lenses, regardless of format, produce the same linear image size.Ģ. You see, Mr Reagan, what happens when you spread misleading information?ġ. You can hang on to your EF lenses, sell your EF-S lenses and buy their full frame equivalents after you upgrade.
LINEUP OF ALL CANON FULL FRAME CAMERAS UPGRADE
If you upgrade to a full frame camera later, it will work fine. If that means you want a massive EF telephoto lens, then go ahead. Quality EF-S lenses hold their resale value just fine. If you are worried that you might upgrade someday to a full frame camera, don’t. You can’t find a non-fisheye lens this wide in Canon’s EF line up. If you want an extremely wide angle lens for your Canon Rebel or 70D, then you’ll need to look at the EF-S line of lenses for something like the EF-S 10-22mm f/3.5-4.5 USM, which will look like a 16-35mm lens on your camera. As to which lens you should buy, my suggestion is to buy the one that fits your needs. Hopefully, you are now aware of which Canon lenses are compatible with your camera. Canon uses lower grade materials, while still producing solid results, for its EF-S line of lenses.
LINEUP OF ALL CANON FULL FRAME CAMERAS PRO
Canon does not produce a “professional” category of EF-S lenses like the pro “L” lenses you find on the EF mount. Benefits of EF-S LensesĬanon EF-S lenses are generally smaller and lighter than Canon EF lenses because less glass and a smaller lens barrel is required to produce an equivalent field of view for a lens that goes on an APS-C camera, like the Canon Rebel line, when compared to a full frame camera.Īdditionally, the EF-S line of lenses are generally more affordable. Because EF lenses have a larger image circle, they will cover full frame sensors and APS-C sensors. They were designed to cover a 35mm film frame. If a Canon EF-S lens were to be used on a full frame DSLR, it would produce heavy vignetting (the corners would be black) because the image circle produced by the lens is too small to cover the larger sensor.Ĭanon EF lenses have been around since the film SLR days. Canon EF lenses are designed to work with full frame and APS-C DSLRs from Canon.Ĭanon EF-S lenses have a smaller image circle that is only big enough to cover the smaller sensor found on Canon APS-C cameras. Put simply, Canon EF-S lenses are designed solely for use on Canon APS-C DSLRs. So, Canon APS-C cameras have a 1.6x crop factor.Ĭanon APS-C cameras include the 7D line, the 70D and lower line and the Canon Rebel line.Ĭanon full frame cameras include the 1D X, the 5D line and the 6D line. This is often times referred to as a “crop factor”. The field of view (how much of a scene you can see through the viewfinder) is smaller when using the same lens on an APS-C format camera than it would be on a full frame camera.įor example, a Canon EF 50mm f/1.8 lens produces a field of view equivalent to an 80mm lens when used on a Canon APS-C format camera like the Canon Rebel line. The Canon APS-C sensor is smaller at 22.3mm x 14.9mm. It is the size of a 35mm film frame – 36mm x 24mm. The full frame sensor is the larger of the two. Brief Explanation of Full Frame and APS-C Cameras At the time this is published, Canon offers two sensor types in its DSLRs – full frame and APS-C (or crop sensor). This is a question that comes up quite often, so I am providing a brief explanation to answer it for those users new to the Canon DSLR system.Ĭanon EF and EF-S lenses refer to the mount type of the lens, which also differentiates between the sensor type.
Canon EF 16-35mm Lens and Canon EF-S 10-22mm Lens
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