Hey....we all make mistakes sometimes.... The info is hard to digest when your all keyed up to buy....rcmarple said:I'm an idiot.
Took delivery of a 1.4x converter to go with my shiny new £1000+ lens and guess what? I didn't do my research properly and missed the slight hitch of AF not working unless your lens is f4 or lower.
Be warned guys and gals...
In my experience the AF is totally unreliable using this method in even very bright light - it's totally hopeless. Image quality is also no great shakes when you add a TC to the 100-400.Pink Fairy said:There are ways to get around this, notably taping over some of the pins of the tc to fool the camera.. but you'll get sluggish & unreliable AF in all but very good light. All in all you're better off without a tc on this lens.