paul schefz
Well-known member
i have the same issue with the 18-35, which i guess is actually a 1.7 wide open? anyway...i am not sure what you are saying...open up all the way, go to the menu and enter (in this case) 1.7?One thing I've noticed with certain unsupported Sigma lenses is that if you use them wide open and then use the "Advanced" tab in the aperture selection menu you can type in an exact value.
You'll need to go back to wide open or it will lock up on you again, but try just typing in f/4 when wide open.