f2.8 reading as f2.1 WHAT???

[Loaded]

Im using a sigma 24-70f2.8 pro lens on my 20D.. I have taken many shots and just realized that the F stop that is recorded is reading f 2.1????????????????

ANYbody know why?

[drewmk2]

Well is everything underexposed? If it works, it's all good. :) That's aftermarket lenses for you.

Just call sigma up.

[lostdoggy]

Well thats your gain. It sounds like a communication error between the camera and lens. I would call Sigma maybe it needs to be rechipped.

[robertwgross]

It might be some screwup in the program that you are using to read the EXIF data. There are several fields that are commonly screwed up by non-Canon software, however the aperture is commonly correct.

Try another program.

---Bob Gross---

[Joytek]

I have a 12-24 sigma lens and it sometimes (only sometimes) goes to f29 as opposed to f22(which is supposed to be the highest f stop on this lens)....it does not affect the pic....just the exif. I am using a 1DmkII.

w.