Why doesnt the 10-22mm work on a full frame camera

ziggy©

ziggy©

Messages
1,940
Name
Dini
Edit My Images
Yes
Just trying to understand the reason why the 10-22mm cannot be used on a full frame camera.

- What is the widest focal length that can be used on a full frame
- I have seen a lot of people use the 24mm-105mm on FF. How does 24mm on a FF compare to 17mm (or even 10mm) on a cropped sensor. Which will capture more of the scene?
 
It can, but it looks like this... Sigma 10-20 on a D700

10mm

_TOM9447.jpg


12mm

_TOM9448.jpg



14mm

_TOM9449.jpg



16mm

_TOM9450.jpg



17mm

_TOM9451.jpg


20mm

_TOM9452.jpg
 
Ok i didnt know that. It looks like 24mm is probably the minimum that can be used before starting to see that effect.

Does this then mean that cropped sensor cameras will then capture more of the scene because they allow less than 24mm or is will 24mm on a full frame capture more of the scene than 17mm on a cropped camera.

Thanks in advance.
 
you can get wider than 24mm on a full frame, the lens just needs to be designed so it is large enough that it doesn't do as shown above.

On a Canon crop (1.6x) 15mm is equivalent to 24mm on a full frame. 10mm on your camera would give the same filed of view as 16mm on a full frame.
 
17mm is 17mm regardless of whether it's on crop or FF. What changes depending on the format chosen is the angle/field of view, which is what you actually see in the final image because the sensor size relates to how much of the image circle is being used.

Lenses designed for crop (DX, EF-S) have a smaller image circle so although the focal length is the same as FF, the image circle is smaller - hence the vignetting above - because the sensor doesn't need the extra image around the edges, meaning the lens can be built cheaper, can be optimised for crop use, and can be lighter and smaller if required.

In general, to get the same image look at a FF, you have to use a lens that is wider by whatever the crop factor is. So, to recreate a 24mm full-frame image, you need to use an 16mm lens on DX (1.5x crop) to get that same amount of image registering on the smaller sensor.

*16mm x 1.5 = 24mm

Canon is slightly different with its 1.6x crop but the mathematics are the same - you'd need a 15mm EF-S lens to recreate 24mm on FF.
 
Last edited:
You can't use it because the CANON 10-22 is an EFS lens and is incompatible with Canon FF bodies.

Besides Vigneting the EFS mount will cause the mirror to hit the back of the lens when the camera is fired.
 
ChrisH said:
You can't use it because the CANON 10-22 is an EFS lens and is incompatible with Canon FF bodies.

Besides Vigneting the EFS mount will cause the mirror to hit the back of the lens when the camera is fired.
Click to expand...

i assume you are talking about the canon, only EF lens authorized on a FF body !
 
specialman said:
17mm is 17mm regardless of whether it's on crop or FF. What changes depending on the format chosen is the angle/field of view, which is what you actually see in the final image because the sensor size relates to how much of the image circle is being used.

Lenses designed for crop (DX, EF-S) have a smaller image circle so although the focal length is the same as FF, the image circle is smaller - hence the vignetting above - because the sensor doesn't need the extra image around the edges, meaning the lens can be built cheaper, can be optimised for crop use, and can be lighter and smaller if required.

In general, to get the same image look at a FF, you have to use a lens that is wider by whatever the crop factor is. So, to recreate a 24mm full-frame image, you need to use an 16mm lens on DX (1.5x crop) to get that same amount of image registering on the smaller sensor.

*16mm x 1.5 = 24mm

Canon is slightly different with its 1.6x crop but the mathematics are the same - you'd need a 15mm EF-S lens to recreate 24mm on FF.
Click to expand...

I have always thought that the type of sensor was the reason that the EF-S lenses were not usable on FF camera. I didn't know that it is the construction of the lens.

I guess this means that the image circle of the EF lenses is larger. Does this then mean that when you use an EF lens on a cropped camera the angle of view you get is a 'cropped' version of what the lens saw? i.e. even though the lens is seeing a larger view, the smaller sensor is not capturing all of it?
 
ziggy© said:
I guess this means that the image circle of the EF lenses is larger. Does this then mean that when you use an EF lens on a cropped camera the angle of view you get is a 'cropped' version of what the lens saw? i.e. even though the lens is seeing a larger view, the smaller sensor is not capturing all of it?
Click to expand...

Exactly right.

Also lenses are sharper in the center than at the edges, so you are discarding the softer bits of the image and using the "sweet spot" of the lens. At the same time, the millions of pixels crammed into the small sensor need good optics to resolve detail on the pixel level from a smaller lens area than a full frame sensor. There is no escape from physics :)
 
Last edited:
ziggy© said:
I have always thought that the type of sensor was the reason that the EF-S lenses were not usable on FF camera. I didn't know that it is the construction of the lens.
Click to expand...

It's a strange standard that Canon have made with the EF-S design. Whereas Nikon made DX lens compatible with it's full frame bodies in DX crop mode (or rather the other way round), Canon has pretty much made EF-S exclusive to crop bodies, although I've read that they can be used in the 1.3x crop if the 1D series, although how true this is I don't know for sure. This short back focus design (the 'S' in EF-S) isn't something I've read up on - something to read up in this afternoon while the mother-in-law holds court ;)
 
You must log in or register to reply here.
Back
Top