autofocus

Hi! I'm suddenly experiencing an auto-focusing issue with my Tamron 28-300mm Pzd VC f3.5-5.6 lens for full frame sensor cameras (Canon mount). I've never encountered this before with this or any other lens. And there was no gradual deterioration: from one day to the next, autofocus just started...

The lens itself is very good. I use it with the Nikon D3100 to do a lot of timelapse of flowers opening. That's from bud to fully open flower. A single session can take several hours so everything gets bolted down solid in a quiet room with no disturbance. Not much latitude for focal-depth so...

Hi! The continuous autofocus (eg. AI Servo in Canon-ese) works fine for my 80D when shooting in live mode. . . which is something I literally never do, always opting to use the viewfinder. I use back button focus, but once I lock focus (single-point) on a subject while using my viewfinder, it...

Hey, ich have the Canon T6i/750D with the Sigma 24mm 1.4 Art lens. I also bought the Sigma USB Dock and tried to calibrate it. I haven't had problems with the first three calibratable distances (0.25, 0.35, 0.6) but when I shoot at distances which are further away than those like 2, 5, 10, 20...

Hi friends! My first post. I wanted to find a place where many knowledgeable people could weigh in. Here's my "story". I am by no means a pro or know as much as actual photographers, but I wouldn't say I'm a complete beginner either. Four years ago I bought Canon Rebel T2i, which is pretty...

I have the Canon EOS M with the 50mm 1.8 lens. When I press the shutter button half way to autofocus, the shutter closes but doesn't reopen. When I press the button again, it opens. Everything works fine on manual focus and the autofocus works with my other lenses. Any help would be greatly...