LShaped210
Member
I just picked up a brand new Tokina 11-20mm f/2.8 and a Metabones Speed Booster Ultra for my Panasonic GH4. When zooming in the lens stops down to f/3.8 at the tele end opens back up to f/2.0 as I zoom out towards the wide end. I've also noticed I can only stop it down to f/16 and it's supposed to go to f/22.
I tested the Tokina on my Canon 7D Mark II and it's constant f/2.8 throughout the zoom range. My Canon 70-200mm f/2.8 seems to work just fine and keeps a constant f/2.0 when used on the GH4+Speed Booster. I'm not sure what to do as I'm extremely disappointed that the Tokina is now f/2.0-f/3.8 instead of a constant f/2.0 when used with the Metabones.
Any one have a similar issue or know a fix for this? :undecided
I tested the Tokina on my Canon 7D Mark II and it's constant f/2.8 throughout the zoom range. My Canon 70-200mm f/2.8 seems to work just fine and keeps a constant f/2.0 when used on the GH4+Speed Booster. I'm not sure what to do as I'm extremely disappointed that the Tokina is now f/2.0-f/3.8 instead of a constant f/2.0 when used with the Metabones.
Any one have a similar issue or know a fix for this? :undecided
