Confused!

Toothie

Toothie

Suspended / Banned
Messages
7,360
Name
Ruth
Edit My Images
Yes
ok just reading some stuff about lenses i'm looking to buy.

The EF-s lenses are the focal lengths listed adjusted for the crop factor on the cropped digital sensors. ie so 10mm is 10mm on a cropped sensor but something use on a full frame??

And EF lenses don't take the crop factor into account? Have i got that right??
 
Focal length is the same regardless of EF/EF-S or the crop factor of the sensor and are given in 35mm terms.

Field of view changes depending on crop sensor x1.0, x1.3 or x1.6 in Canon range.

EF-S lenses will only fit only 40D and below because the design of the back of the lens is different and it will hit the mirror on 5D and 1D series.

From Wikipoodia: The "S" in EF-S stands for "short back focus", which means that the rear element of the lens is closer to the image sensor than on regular 35 mm SLR cameras. The proximity of the rear element to the image sensor greatly enhances the possibilities for wide angle and very wide angle lens, 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.
 
Depending what the crop factor is Ruth for your camera the 10mm will become either 13mm or 16mm have a look in you manual or only for the crop factor of your model.

Shutterman
 
Thanks guys, it was the FoV that i ment but i get it now, and the s has nothing to do with it :D
 
I think it's time to wheel out my visualisations again.

Visualisation #1 shows a simulation of the view through a lens, and the portion of the picture which is captured by sensors of different sizes. (I've used full frame / 1.3x / 1.6x because I'm a Canon user.) As you can see, crop-factor cameras just capture a smaller portion of the scene than full-frame cameras. Nothing else changes.

Crop-factor-demo-1.jpg


Visualisation #2 shows (crudely) what those designed-for-digital lenses do. On the left is the image projected by a "traditional" lens like a Canon EF or a Sigma DG: the image circle is large enough to cover a full-frame sensor or a frame of 35mm film. On the right is the same view through a designed-for-digital lens such as a Canon EF-S or a Sigma DC. It's simply a smaller piece of glass, which is why it's cheaper, and you can see why they only work on crop-factor cameras.

Crop-factor-demo-3.jpg
 
Thanks for that, i did kinda get the whole crop factor thing - bit something i read about the EF-s lenses confused me and i didn't get what they ment.
 
You must log in or register to reply here.
Back
Top