what is the difference between autofocus and fixed focus?

Answer 1

autofocus vs. fixed focus, lets define 1st.

autofocus = the camera has to do the focusing for you just press the shutter button. autofocus is needed especially in the camera with zoom lens, ex. 28mm to 80mm (focal length). coz the camera need to adjust its aperture and shutter speed to capture sharp image everytime you change the focal length.

manual focus = is the other type of focusing technique, wherein youre the one who do the calibration to capture sharp image. applicable with zoom lens also.

fixed focus = in my idea is a type of camera with a fixed lens for example 28mm and wherever you shot, exposure has the same appearance. because the aperture, shutter and focal is the same at every shot. example of this type is the traditional point and shot 35mm film type camera.

Answer 2

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You won't really learn much by looking at samples. What you would need to do is use the lens in the field and see if you gained some versatility with the fixed aperture lens. Since you are looking at a 50-200 lens, you would need to see several comparisons made under indentical conditions. You would need to see a subject at 10 feet away with each lens and then one at 20', 50', etc. Repeat this for various focal lengths. You would end up with 100 comparison shots. Since you say you are looking for a lens for outdoor portrait photography, that narrows it down somewhat. If you were doing all head shots, you could just get a fixed lens and know for sure what your results would be. I imagine that you will be doing various poses and various crops in the outdoors, though. Depth of field is also a function of the working distance between the camera and subject, so this adds more challenge to making up samples for you. I would agree that an f/4.0 will be quite adequate for throwing the background out of focus in almost any situation. If you are a beginning amateur, consider the cheaper lens and abandon it only if you find that it is inadequate and you have made enough money from your photography to pay for the upgrade lens. I don't know what make camera you are using, as I can't find but one 50-200 lens (Pentax), so it's not like you would have a choice. Maybe you meant a 55-200? If you have a Nikon, we have a few members who swear by the Nikkor 24-85mm f/2.8-4.0D IF Autofocus Lens ($565) for portrait and model work. It has the wide aperture that you want.

Answer 3

autofocus means the camera automatically focuses on what you are aiming it at. There are various ways this can be achieved. Better cameras will tend to do this (much) faster, and in a much more reliable manner so you'll have very little or even no out of focus shots. Better cameras will also better be able to do well in special situations, say if you're taking a picture of a landscape from behind a window.

the opposite of auto focus, is manual focus. This means that the camera will not do the focusing work for you, but rather that you will have to turn a ring on the lens to obtain proper focus. Many high-end phtographers still find that they can be more precise than the auto-focus. Also, when you manually focus you can chose which plane to focus on to compose your image, whereas the auto focus will average and may end up picking that big rock when what you wanted was the person in front of it.


fixed focus is something different. Fixed focus refers to a lens that will have a fixed angle of view (for example a 50mm lens on a SLR camera is said to reproduce roughly what we see with the naked eye). The opposite of a fixed focus lens is thus a zoom lens, where you can vary the field of view, say from 20mm for a wide angle view (you'll see more of the scene), to a 150mm modest telephoto (you'll see less of the scene but you'll have been able to concentrate on a detail of it).

hope this helps

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Answer 4

"Fixed" focus means that you have no control over focus at all. The lens opening is small enough that pretty much everything will be in acceptable focus. This has limitations, though, particularly the requirement for adequate lighting.

"Autofocus" actually changes the focus of the lens, bsed on the distance of the subject from the camera. There are a few ways that cameras can measure this, such as analyzing the sharpness in a specific target zone or by bouncing light or sound waves or infra red light off of the subject.

Fixed focus is generally associated with low cost cameras, including those throw-away cameras you can buy in the drug store.

Actual autofocus is generally associated with more sophisticated cameras, ranging in price from about $100 to thousands of dollars.

Answer 5

Auto-focus is fancier. A fixed-focus lens is very simple and you can't change the focus. It's OK for taking shots of smiling faces about 15' away. An auto-focus lens gives you more control over focusing so you can get right up to a single rose and focus on it, then turn around and set the focus to far away to get a picture of the sunset.

Answer 6

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