p.1 #1 · Question about Tokina 28-70mm wide open on Rebel XT
Hello, I just bought a Tokina 28-70mm f/2.6-2.8. It's supposed to be f/2.6 on the wide end. However, I don't seem to be able to make it go to 2.6 on my Rebel XT. Is there something wrong or can the camera just not take advantage of this aperture? Are there cameras that can take advantage of it? Just curious. Haven't had a chance to test the lens. I hope to do that at our family reunion tomorrow. Thanks for any light you can shed on this.
p.1 #3 · Question about Tokina 28-70mm wide open on Rebel XT
I see you have a 50/1.8, will that register 2.6? I have an xt but no lens below 2.8 at the moment but i'm not sure it let you dial in 2.6.
Hope your lens is good as I had a tokina 28-80 ATX Pro which was supposed to be the best of the bunch (tokina seem to have quite a few in the 28-70/80 range) and it was so soft until stopped down to 5.6 and lacked contrast in a big way which made images washed out. Shame because it was well built and the AF is the best implementation of a non USM micro motor there is.
p.1 #4 · Question about Tokina 28-70mm wide open on Rebel XT
I believe that any Canon Camera will only show the apertures that are programmed into it. So therefore even though it shows up as F2.8 the lenses aperture will be wide open and therefore F2.6. Because the camera uses TTL metering also you will get the right exposure whether F2.6 or F2.8
p.1 #5 · Question about Tokina 28-70mm wide open on Rebel XT
Thanks to all that responded. My 50mm 1.8 registers an f/2.5, so maybe the camera just shows 2.8 even if the Tokina is at 2.6. It does seem to get acceptably sharp by f/4. Color and contrast are good. Overall, I like the lens. I don't know if this one, being an AT-X 270 Pro II, is of the Angenieux design or not. I don't have a good feel for the quality of the out of focus areas yet.
Nov 28, 2008 at 12:30 PM
Chris Beaumont Offline • • • • • [X]
p.1 #6 · Question about Tokina 28-70mm wide open on Rebel XT
As I understand it, every D-SLR I've used works in the established 1/3 stop range, of which the nearest to f/2.6 is f/2.5 (1/3 stop faster than f/2.8), whether this is the reason it doesn't show I couldn't say, but as others have said, if it truly lets in f/2.6 amounts of light wide open, the camera will make use of it, even if it doesn't register.
