Westminster fountain at sunset

by Jorge Córdoba

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4

When the light gets dim enough there comes a time when you have to give up shooting sequences of fast moving objects coming towards you and instead pre-focus on a spot and wait for the subject to hit the mark. Cross ties work pretty good for locking focus on a point the train is about to be. You also gain the advantage of getting the one shot when the train ...


3

I suspect that you have the camera set on auto focus single shot which by default will only fire if it can acquire focus. Since getting AF to work in the dark is not easy (but not always impossible) I think what happened is the camera could not get a AF lock and would not trigger. To take pictures like that switch to manual focus and set the lens to ...


3

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 ...


2

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 ...


2

I have a few things I try when timing doesn't allow pre-selecting a focus point: Focus and recompose Using the center focus point I'll half-press the shutter and recompose to my desired composition. Use a smaller aperture You can use a depth of field calculator (such as this one) to ensure the subject you're photographing is in focus within the near and ...


2

For phase detection AF to work properly, the camera needs more than just a clear glass replacement for the removed filter, it needs a replacement of a different thickness. IR rays don't focus on the same point as visible light, which is why lenses have (used to have?) a red dot to tell you how to adjust focus from the visible light distance to the correct ...


1

Going on the assumption you are asking about using point focus vs area focus, there isn't a perfect answer and it depends entirely on what your skill with the focus system is, the capability of the focus system and what you are shooting. The strength of area auto focus is that it allows the camera to quickly find something to focus on without thinking ...


1

Combining and restating Toph's answer and Matt Grum's comment: learn when to best use the (many! different!) autofocus modes of your camera, and practice with them extensively. There are many combinations of AF modes and some of them will be absolutely horrible for certain situations, while others will be horrible for other situations. You've already ...


1

If the camera is having trouble focusing, you can use try using manual focus and waiting for the train to come to the correct depth and take the photo at that moment (or take a series of photos near the time). Additionally, if you have enough light, as Michael Clark noted, you can stop down the aperture (bigger number) in order to increase the depth of ...


1

In general, and this applies to every camera from the cheapest cameraphone to the most expensive SLR, "auto" means "do what the camera thinks is best for the given scenario". While certain cameras may fix some "auto" parameters under some circumstances (for example, I know that my Canon SLR fixes ISO at 400 if the flash is in use), the general case is that ...


1

If this issue is progressively getting worse as you have stated, there is a good chance the autofocus sensor is in need of cleaning. If changing to a different focus zone provides better focus lock then this would tend to confirm a spec or two on the sensor. A general haze can develop on the focus sensor from condensation and/or airborne pollutants. As a ...


1

If the lens does not have the letters AF-S printed on it, it cannot be autofocused from a D3x00 (or D5x00) body because the lens has no focus motor, and the camera body has no focus motor, and you need at least one to achieve autofocus. You must manually focus the lens using the focus ring (the one with the distance markings) on the lens itself. If the ...



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