by Jon

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Take some pictures! Using Auto Focus, are the images in focus? Is the point of focus the same distance from the camera on each side of the frame? On the top and bottom? I would be more concerned about the lens mount flange remaining parallel to the sensor. Test this by taking the fastest lens (widest aperture) you have and shoot a flat surface such as a ...


In the second image there's a metal-bar-looking-thingy right between the mother's and father's head that is very much in focus (at least it looks like that on the web-sized image) - so I would guess the AF focused on that bar and not the mother's face. The area covered by the AF sensor is substantially larger than the rectangle you see in the viewfinder so ...


I shoot both a Canon 50D and the micro four-thirds G3 and GX7. I use my 50D/EF 400mm f/5.6L USM combo for bird in flight shots. For me, the difference is chalk and cheese at the speed of reaction I have to have to get a BiF shot. The G3 with my 45-200 OIS are perfectly capable of taking perched/walking bird shots, though, as you suspected. G3+45-200 ...


It depends on the camera, but in general, even a basic PDAF should be light years ahead of CDAF for any kind of action shot. The problem with CDAF is that it is a guess and check approach. The camera can't tell that it is in focus unless it tries going too far to one side and then too far to the other. For a still object, this works ok, but when the ...


Take a photo (with AF) of something flat and fairly regular (like a brick wall) that is parallel to the camera sensor at your normal working distance. If the entire image is soft or if some corners are noticeable softer than the other corners (there is always some variation, only worry if the difference is big enough to be noticeable at normal viewing ...


When you've focused the lens at a certain point you've actually focused an entire plane (that includes the point you've set your focus at) called the focal plane. This plane is perpendicular to the optical axis of the lens. Objects that are close to this plane (but not in it) may be acceptably in focus depending on the depth of field. The left diagram ...

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