Canon Question

[NashVegas]

So .... I picked up an XTi kit today they have at Costco (comes with 2 IS lenses, so why not?) and one of them is the EF-S 18-55mm f/3.5-5.6 IS.

Am I to understand that the high end (smaller aperture) of the F-stop is set in the camera and not on the lens? Or is that just to fool me?

[ManiacJoe]

1. Note quite.

What the range means is that the larger apertures for the lens will change (get smaller) as you zoom from "wide" to "normal". For example, at 18mm you will be at f/3.5; as you move toward 55mm you will slide to f/5.6. In reality you will get to f/5.6 long before you get to 55mm.

If you set the aperture at or higher than f/5.6, it will stay at that setting for the whole zoom range.

The more expensive lenses will stay constant at their larger (smaller number) f-stops.

In case I misunderstood your question, if the lens has an external aperture ring, you will probably need to set it at the largest f number (smallest opening) and do all the controling by the camera dials.

[NashVegas]

2. No

I'm talking about the f-22 (and higher) end. I didn't realize that aspect would be in the camera and not on the lens.

[JeffR]

3. Maximum & minimum aperture are dictated by the lens

My Tokina 100mm will go to f/32, for example, while the 12-24mm only goes to f/22.

The camera can't exceed the aperture range of the lens.

[Adsos Letter]

4. I saw yer OP title...

and I thought you meant one of these...





:D

[NashVegas]

5. If I Were Going to Mean Something Like That

I'd have meant something like this:

http://www.youtube.com/watch?v=_IN5If_Ll-E

[Blue Fire]

6. The f-stop range is dependent on the lens, but controlled on camera.

Canon EOS cameras and EF lenses communicate electronically. For example, in Av mode (aperture value), you can manually control the f-stop using the wheel on the camera, but only within the lens' given range.