And doh, the exif is gone on one of 'em you are right! Ack! I think it's because I was messing around with image analyzer and used it to resize it (just messing around). it must have cleared it. Anyway, afaik it was like ISO 800 , f/8. I basically always use f/8. Though it doesn't perform badly at f6.3, it gets a nice boost at f/8 and DOF is nice for birds. I see you also using the same 6d 50-500 combo for some things. Works nicely. I swear they updated the coatings at some point, because I see none of the low-contrast look that the shots had when the lens was released. It's super poppy. The only real optical flaw is quite a bit of CA at the long end. Also wish there was like a 3 meter - inf focus limiter, but oh well! Life's not perfect.