Serene Life

by garik

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0

I suppose there's a simple way. You could bring a measuring tape or a long ruler down with you underwater. Hold the ruler out in front of the camera and observe at what distance does the markings of the ruler become clear. That should give you a fairly accurate measurement of the focusing distance in water.


1

Maybe your reverse motor is stuck in the helix / bent plastic path. You need to push it to adjust. http://www.fotomozaic.ro/artikel.php?idstory=225&s=1 The motor has weak, broken gears.


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Regarding "always wastes huge amount of time", this is not unlike many compact cameras using the contrast-based AF, the focusing algorithm has to blindly try various lens positions and compare the results, because it has no other way to know what the correct focus distance could be. Some smartphones, having specialized focusing hardware, can also use faster ...


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The best way to focus at infinity is by using a so-called Bahtinov mask or a Hartmann Mask. A problem you will have to deal with is tripod motion during the long exposure. Also, if you photograph the sky, the rotation of the Earth will cause the stars to become small trails. It is almost impossible to take perfectly sharp pictures without using remote ...


2

There are basically two ways to do this: Autofocus works properly with an IR-pass filter in place, as does auto-assisted manual focus (you turn the focus ring, the camera tells you if things are in focus). You are effectively focusing in a low-light situation, however, as the autofocus sensor has an IR-blocking filter just like the image sensor does. Many ...


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Magic Lantern has a focus stacking feature. if you have a Canon DSLR, see there if your camera is supported.


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Just capture all the focus planes at the same time... https://www.lytro.com/ http://en.wikipedia.org/wiki/Light-field_camera


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As others have wrote - it is difficult to make lenses that can focus at very different distances. Designer of the lenses have to choose possible distances because it may affect size, weight, complexity and finally cost of the lenses. In fact there are also lenses than can focus at very close distances but CAN'T at far distances. The example is this: Canon ...


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 ...


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 ...



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