* Up to a point. A lens that is purpose-built to be a telephoto lens for a small sensor is unlikely to actually work as a wide angle lens for a larger sensor because it will be designed to deliberately exclude rays of light that come from outside of its intended field of view. Excluding rays that won't hit the sensor is desirable in any lens, because it will reduce lens flare and improve the contrast of the pictures.

Longfocal length

LJ Britton · 138 — carbon-14 light- and dark-bottle method: U.S. Geological Survey open- tile report, 43 p. Megard, R.O., 1972, Phytoplankton, photosynthesis, and phosphorus ...

I would guess that the lens used in the second one had a "normal" field of view (i.e, neither telephoto, nor wide-angle.)

FOV tofocal length

What I understand is that higher focal length affects your image because you have to move further away from your subject. The background will then seem closer to the subject.

Focaldistance vsfocal length

The field of view is related to both the focal length and the sensor size. For any given sensor size, lenses with a longer focal length will give you a narrower field of view, and lenses with a shorter focal length will give you a wider field of view.

Focal lengthformula

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higher focal length affects your image because you have to move further away from your subject. The background will then seem closer to the subject.

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I don't see much in common between the two pictures; They're both black and white, both architectural subjects, both shot with the camera pointing perpendicular to a flat wall.

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All photographic images will be seen as correct as to perspective provided zero magnification has been applied (contract print or same size as film or sensor) viewed from a distance approximately the same as the working focal length of the lens. This viewing distance is likely not possible, as todays cameras yield a miniature image that must be magnified to be viewed.

Focal length

Let me add, in real life, we see these distortions as we look about, however our eye / brain visual system ignores them. When viewing photographs that are distorted, we mostly ignore but, based on subject matter, sometimes the distortion is too much to ignore.

What isfocal lengthof lens

The working distance of the objective in this example is 7.4 mm. It is considered to have an 'extra-long working distance' and is abbreviated as ELWD on the ...

I understand that geometry and composition are very important to achieve this sort of style.Black and white is also important.

For a lens of a given focal length, if you put a smaller sensor behind it, the sensor will see only a small part of the whole image (i.e., a narrow field of view), whereas a larger sensor in the same place will see a wider field.*

Translations in context of "LED-Hintergrundbeleuchtung" in German-English from Reverso Context: LED Hintergrundbeleuchtung.

focallength是什么

Macro. Berlin, Germany. Founded in 2007 by Stefan Goldmann and Finn Johannsen.

As an example: A picture is taken using 50mm lens with a full fame camera. This image measuring 24 by 36 millimeters . The viewing distance is 50mm, but this is not possible without optical aid. However, we enlarge this image to 8 x 12 inch size and display on paper or computer screen, applying about 8 ½ X magnification. Now the viewing distance switches; it is 50 x 8 ½ = 425mm (16 ¾ inches).

With a smaller sensor you would use a smaller focal length to keep the same field of view (35mm instead of 50mm, for instance).

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But the overall image perspective depends on a single thing (if we forget optical aberrations): where the camera is when the picture is taken.

What I understand is that higher focal length affects your image because you have to move further away from your subject.

The first one—the commercial building—Appears to be lit by bright sunlight at a shallow angle to the wall, but it has an "underexposed" look to it. Can't tell if it actually was underexposed in the camera, or if that's a deliberate low-key effect (i.e., no white pixels anywhere within it) that might have been done in post production. It's hard to say much about the camera's angle-of-view because the subject has very little depth.

Through the use of special optical materials and optic design, thermal lensing for lasers with powers in excess of 1KW is reduced to less than the Rayleigh ...

A smaller sensor is better when you want a smaller, lighter, less expensive camera that uses smaller, lighter, less expensive lenses. A bigger sensor is better in most other ways.

When we look at photographs, be they on paper, on TV, computer screen, or motion picture screen, we apply these same visual skills to make perspective judgements. Making perspective judgements when viewing photographs can be wrong, because we can only guess the location of the camera and the degree of magnification that was applied creating the image.

In the second picture—the residential one—it's the lighting, not the subject, that is very "flat." Looks like it was taken under an overcast sky, although there is just a hint of shadows of the bushes on the driveway. It looks like a print on "high contrast" paper, partly because the film grain is so visible, and partly because of the featureless-blackness of the bushes.

In other words, to view an image with correct perspective, we view from a distance equal to the focal length of the taking lens multiplied by the magnification used to create the enlargement. Most images look OK when these conditions are disregarded. However, some images, particularly the human face and images taken using extreme wide-angle or telephoto, so violate this “rule-of-thumb”, our eye / brain will be deceived, and we perceive mistaken perspective. This will be compression, flatness, and / or other distortions.

Focal length is one of main parameters of any lens. This is the distance from the optical center of a lens to the camera sensor when the lens is focused to ...

focallength中文

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That's only indirectly true. What you're really describing there is a lens with a narrow field of view (a.k.a., a "telephoto lens.")

The other factors in achieving a flat look are not technical. In fact, images are flat, so getting the impression of depth from them requires visual hints that our brains use to interpret that the photo is actually a 3D scene:

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We are blessed with remarkable visual ability. When we look about and observe objects, we automatically make assumptions regarding their whereabouts with regards to their surroundings. All this falls in the category “perspective”. We learn these cognitive skills soon after birth.