lens aperture वाक्य
उदाहरण वाक्य
मोबाइल
- For a given subject framing and camera position, the DOF is controlled by the lens aperture diameter, which is usually specified as the f-number, the ratio of lens focal length to aperture diameter.
- These were early attempts by Nippon Kogaku to provide shutter priority autoexposure by having an electric servomotor automatically turn the lens aperture ring in response to the set shutter speed and light meter reading.
- The FT can also operate the later Canon FD series lenses in stop-down mode, but the earlier R series has a different lens aperture mechanism and cannot be used, although the bayonet fitting is similar.
- Contemporary photographic convention denotes lens apertures with a slash, such as 22 or 64, but in its writings the group always used a dot or period instead ( as in " f . 64 " ).
- The photographer would adjust the shutter speed to freeze or blur motion and / or the lens aperture f-stop to control depth of field ( focus ) until the needle was centered between two pincer-like brackets.
- It is called " subjective " because the detailed structure of the speckle pattern depends on the viewing system parameters; for instance, if the size of the lens aperture changes, the size of the speckles change.
- The dial above the shutter button will adjust the shutter speed in shutter priority Tv / Time value mode, but in aperture priority Av / Aperture value mode this same dial will adjust the lens aperture.
- Preset aperture controls have taken several forms; the most common has been the use of essentially two lens aperture rings, with one ring setting the aperture and the other serving as a limit stop when switching to working aperture.
- The " Follin ophthalmoscope " was an early model of ophthalmoscope & mdash; it contained four correcting lenses mounted in a revolving disk so that each lens may be rotated in front of the lens aperture of the device.
- Exposure metering is through-the-lens ( SLR lenses, where the diaphragm controlling lens aperture is generally closed only at the time of shutter release, rangefinder camera lenses close or open the diaphragm directly as the aperture control is applied ).
- Exposure is usually controlled by changing the lens aperture ( the amount of light it gathers ), the shutter speed ( how long light is gathered ) or sensitivity ( how strongly the film or sensor responds to light ).
- The reflector cannot be larger than the lens aperture, and thus all the radiated light that is neither redirected forward by the spherical reflector behind the bulb nor emitted directly through the lens is absorbed by the casing as waste heat.
- Like the contemporary Nikkormat FTN ( see above ), the EL mounted all rabbit ear Nikkor lenses with a double twist of the lens aperture ring and its viewfinder had a choice of Type J or Type A fixed focusing screens.
- AI Nikkor lenses had an external " meter coupling ridge " cam on the lens aperture ring that pushed on an external " meter coupling lever " on a ring surrounding the FT3's lens mount flange to transfer lens set aperture information.
- Instead of the photographer picking a shutter speed to freeze or blur motion and choosing a lens aperture f-stop to control depth of field ( focus ), the A-1 has a microprocessor programmed to automatically select a compromise exposure based on light meter input.
- In aperture priority mode, a steadily lit LED indicated the shutter speed automatically set by the electronic microprocessor in response to the light reaching the built-in, open aperture, through-the-lens ( TTL ), centre-weighted gallium arsenide phosphide photodiode ( GPD ) light meter and the set lens aperture.
- And you'll probably never read something like this in another movie review : It's impossible to overemphasize the importance of the contributions of HD technician Stefan Ciupek, who controlled the video color balance and amount of light that came through the lens aperture, and focus-puller Andre Schneider.
- Its controls were transitional between those of mechanical SLRs and future professional film and digital SLRs : the F4's electronics, LCD viewfinder display, autofocus, programmed auto-exposure, and matrix meter looked to the future, but it also retained classic dedicated analog dials for shutter speed, lens aperture, metering pattern, and exposure compensation.
- Lens aperture diffraction also limits MTF . Whilst reducing the aperture of a lens usually reduces aberrations and hence improves the flatness of the MTF, there is an optimum aperture for any lens and image sensor size beyond which smaller apertures reduce resolution because of diffraction, which spreads light across the image sensor.
- Light coming from a point in the object diffracts through the lens aperture such that it forms a diffraction pattern in the image which has a central spot and surrounding bright rings, separated by dark nulls; this pattern is known as an Airy pattern, and the central bright lobe as an Airy disk.
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