What does ef s stand for canon

You live and learn, I should have researched that myself. Which one is it? I guess I always assumed that the number on the EF-S lens was adjusted already since they are designed for the smaller sensor.

So that assumption is wrong? I guess once I get a few EF lenses I can find out. Your prior assumption is wrong. There is no adjustment on the focal length label of the EF-S lenses. The variable when switching between lenses is the sensor size. The crop factor we are talking about is brought into play because the Canon Rebel series has a smaller sensor. The angle is determined by the trigonometric not arithmetic relationship between the sensor's diagonal measurement and the lens's focal length.

A 50mm lens has a degree diagonal angle of view on a Canon Rebel. An 80mm lens has a degree diagonal angle of view on a Canon 5D. The crop factor refers only to image size. It does not have a linear relationship with the angle of view.

Most photographers have a poor technical grasp of photographic principles. Or that red, blue, and yellow are the color-printing primaries. I will continue to describe the term in the way it is accepted in the industry and the way Photography Bay readers can better understand how to use their cameras. It is you who are complicating the issue, by giving an incorrect and unneeded explanation. The following is probably the simplest way to explain it in words. A drawing is better. It sees less of the image than a full-frame sensor would see, so objects in the field of view are therefore larger when both images are viewed or printed at the same size.

The smaller the sensor, the larger the crop factor. Can I get a Ef85 for a canon t5i and get distance from subject but still keep sharpness or the 50mm n be close to subject can anybody help. 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. It is not affected by anything other than the focal length and the distance from the subject.

This is Photography , and should be explained in any good book on photography. I learned it 50 years ago in a book by Andreas Feininger. Both lenses work fine on the Rebel T5i. As noted in the article, the EF lenses will work on the Rebel cameras just the same as on Canon film cameras and full frame digital cameras.

Both lenses will fall into the range of a common portrait lens field of view. I need an explanation for Dummies like me. It came with an EF-S lens.

What is your thought? Thank you so much! If a 30mm lens is mounted on an EF-S body with a multiplier of 1. On their respective bodies, both cameras give the same angle of view. How is that in any way deceptive? The only difference is that the 30mm lens will provide greater depth of field at the same f-stop. Attaching the EF lens to a cropped sensor body mandates use of the multiplier for both F stop and focal length. This is done to manipulate people into thinking they are getting something for nothing.

F-stops are f-stops. Applying the 1. That the Canon EF-S lenses are mislabeled is my point. Since the Canon EF-S lenses are made for cropped sensors, they should be labeled accordingly, and then when EF-S lenses are used with a full sensor the photographer would multiply by 0. Probably Canon does what they do for expediency. EF-S is a lens mount system. The camera you attach a lens to does not alter the optics of a lens.

A 35mm lens is a 35mm lens is a 35mm lens. Same thing with point and shoot cameras. But marketing cannot change optical physics. Doing it any different with the interchangeable lens system would be much more confusing. Does the position of the optics and diaphragm relative to the sensor change? In general, the image circle is slightly larger than the diagonal of the image frame film or sensor. The desired focal length and coverage are independent, and are both fully under control of the lens designer.

One does not control or determine the other,. All lenses with the same focal length render objects the same size. All lenses for a given format have coverage of about the same diameter.

Do you understand that perspective-control lenses must have large coverage, so that the lens can be shifted? But a 24mm PC lens renders objects the same size as a 24mm regular lens. Canon did publish a technical report about this, but the link has been dead for some time.

However, you can view a copy using the way-back machine. They are entirely different things. While it has the same inner diameter as the EF mount, the RF mount has a much shorter flange focal distance.

The RF mount has more connections than the EF mount for faster data access and more data channels needed to serve the new microprocessor in the lens. The adapter has no optics and despite the different number of connections permits EXIF data and autofocus. Since then, especially after the release of the RF lenses and body lineup, the EOS-M has, in my opinion, become the third wheel in a relationship.

They are purposely not promising any new lenses, and the upgrades they deliver to the bodies are hardly exciting. It is not officially dead, but simply continuing its existence on life support with no hopes for improvement. Having said that, would I recommend investing in the M mount ecosystem?

If you upgrade to an RF mount body in the future, you will still be able to use EF lenses on it with adapters, without compatibility issues, and still more-than-acceptable performance. Unfortunately, no. Canon has made several statements over the past year indicating that they will not be making new EF lenses.

That is a simple way of saying that they are moving away from the EF mount, without having to explicitly say it. Combine the fact that all their new pro bodies even semi-pro and beginner, technically now use the RF mount except the IDX MK3 , there is little incentive for Canon to keep making new EF lenses. The proximity of the rear element to the image sensor greatly enhances the possibilities for wide angle and very wide angle lenses, enabling them to be made smaller, lighter containing less glass , faster larger aperture and less expensive.

Most current Canon EF-S lenses are wide angle. Any EF-S fit lenses you own usually marked with a white square near the EOS mount won't work or fit the 5d mkII, as these are designed to fit crop sensor cameras like the T2i and not full frame sensors like the 5D mkII. As an addition, some non-canon brand lenses designed for crop sensor cameras do still come with a EF mount, so they will fit on a 5d mkII, but often won't fit the full frame of the image.

I have a Sigma mm that is EF fit and you can see the lens hood on a full frame until you zoom in to around 14mm. It works fine however. EF-s lenses are a slightly different format whereby the rear element sits closer to the lens, this is possible due to the smaller mirror with APS-C sensor.

The distance from the back of the lens to the image plane is known as the back-focus distance, hence the s in EF-S standing for short back focus. Other manufacturers have lenses designed for smaller sensors with appropriately smaller image circles but they don't have a different back focus distance. Having the lens sit slightly closer does make it slightly easier to design wide angle lenses, however I've heard the reason Canon introduced EF-S lenses was so they could scale down existing lens designs as a base for the optical design to avoid having to start from scratch.

Hence the EF-S 60mm macro is a It's often said you can't use EF-S lenses on a full frame body such as the 5D, 1Ds but this is not strictly true.

Canon use a different shaped rear baffle to physically prevent you mounting as the mirror could hit the lens and cause damage. However this can be removed to allow mounting, and since the rear element moves when zooming there are positions that allow shooting.

Vignetting is a problem as EF-S lenses project a smaller image circle, but again the image circle can get bigger while zooming so some focal lengths work ok. Using an EF-S lens on a full frame body would be extreme however the 1. Whilst you can't go wider than 12mm, you do get a mm providing a sorely needed ultra wide option for the 1D. You do get some vignetting at 12mm, which can be fixed apparently if you Dremel off the filter threads :-O.

They're not compatible on full-frame cameras. These cameras have a white square on the mount's surface, along with the typical EF red dot that all EOS cameras have.

EF-S lenses are a specific mount that was designed to better suit the new digital bodies. The EF-S lenses are specially constructed for cameras with smaller sensors, so it can't be used on a camera with a full frame sensor. If the mount on the EF-S lens is long enough, it can come into contact with the camera mirror, causing the camera to break.

However, not all EF-S lenses have this problem. Some EF-S lenses have mounts that will interface without damaging the mirror. EF-S lenses are also more compact compared to EF lenses, which will help photographers who travel frequently. Which means that an EF-S lens mounted onto a full-frame camera will give you a heavy vignette, like this:. Both will interface just fine with your camera body. See also : Best Lens for Bird Photography.

If you want to do any type of photography that involves a wide-angle lens, then I recommend EF-S lenses.