SLR: Difference between revisions | Camerapedia

Line 1:

+

porn

−

''To have a list of SLR cameras, see the [[:Category: SLR]].''

−

<div class="floatright">http://static.flickr.com/31/45501182_d9cd52b82d_m.jpg</div>

−

'''SLR''' is an acronym for '''Single Lens Reflex'''. What does that stand for?

−

* '''Single Lens''' — The camera uses one lens for both taking and viewing. In other words you look through the same lens as the camera uses to expose the film or sensor (as opposed to [[TLR|twin-lens reflex cameras]]).

−

* '''Reflex''' — Refers to the mirror and its movement that makes the use of a single lens possible.

−

When looking into the viewfinder of an SLR camera, you are looking through the lens via a mirror that blocks the shutter mechanism, which in turn blocks the film. In most modern SLRs, the [[aperture]] of the lens is stopped wide open when you are focusing and composing the image. This allows the brightest possible [[viewfinder]] image. In older cameras with 'manual stop down lenses' you would have to set the lens aperture to its widest setting while focusing and composing, and then manually change the aperture to your intended exposure setting before releasing the shutter. In modern SLRs, the aperture setting can be set for you automatically.

−

When you press the [[shutter release]], the first thing that happens with a modern SLR is that the lens aperture stops down from its wide open setting to the taking aperture. This is why the view through the camera often goes darker than it was immediately before the shutter is tripped.

−

Simultaneously to the aperture stopping down, or following it, depending upon the exact mechanical specifications of the SLR used, the mirror you had been using to look through the lens with swings out of the way of the shutter and film. This is the reason that the viewfinder goes black in an SLR when you press the shutter release.

−

With the mirror out of the way the film is now directly in line with the lens but still shielded by the shutter mechanism. The shutter mechanism is now tripped resulting in the film frame being exposed via the lens.

−

Once the exposure is complete and the shutter is closed the mirror, in most modern SLRs, swings back into the taking position and you can once again see through the viewfinder. This is known as an 'auto return mirror'. In older and more primitive cameras the mirror will stay in its 'up' position and so the view finder will remain black until the photographer has primed the mechanism again.

−

In many vintage SLRs (and few modern ones with interchangeable finders), the image on the ground glass is directly seen from above (waist-level finder) — it's upright, but reversed (left and right). In most modern SLRs, the ground-glass image is seen through a [[Pentaprism|prism]] that resides on top of the ground glass screen. The view through the [[Pentaprism|prism]] gives you an upright, unreversed viewfinder image (eye-level finder).

−

gay

−

paki

−

==Links==

−

* [http://thispublicaddress.com/tPA4/archives/2006/05/monocular_duplex.html the Monocular Duplex, one of the earliest SLR (by Calvin Rae Smith , patent 1884)] on the Public Address [http://thispublicaddress.com/]

−

* [http://www.photopentax.com/compatibilite-en.html The largest database Screw Mount M42 (lenses) compatible SLR (In english and French)]

−

[[Category: SLR|*]]

[[Category: Camera architecture]]

Changes: SLR

Revision as of 09:55, 9 February 2015

@@ Line 1: / Line 1: @@
+porn
-''To have a list of SLR cameras, see the [[:Category: SLR]].''
-<div class="floatright">http://static.flickr.com/31/45501182_d9cd52b82d_m.jpg</div>
-'''SLR''' is an acronym for '''Single Lens Reflex'''. What does that stand for?
-* '''Single Lens''' — The camera uses one lens for both taking and viewing. In other words you look through the same lens as the camera uses to expose the film or sensor (as opposed to [[TLR|twin-lens reflex cameras]]).
-* '''Reflex''' — Refers to the mirror and its movement that makes the use of a single lens possible.
-When looking into the viewfinder of an SLR camera, you are looking through the lens via a mirror that blocks the shutter mechanism, which in turn blocks the film. In most modern SLRs, the [[aperture]] of the lens is stopped wide open when you are focusing and composing the image. This allows the brightest possible [[viewfinder]] image. In older cameras with 'manual stop down lenses' you would have to set the lens aperture to its widest setting while focusing and composing, and then manually change the aperture to your intended exposure setting before releasing the shutter. In modern SLRs, the aperture setting can be set for you automatically.
-When you press the [[shutter release]], the first thing that happens with a modern SLR is that the lens aperture stops down from its wide open setting to the taking aperture. This is why the view through the camera often goes darker than it was immediately before the shutter is tripped.
-Simultaneously to the aperture stopping down, or following it, depending upon the exact mechanical specifications of the SLR used, the mirror you had been using to look through the lens with swings out of the way of the shutter and film. This is the reason that the viewfinder goes black in an SLR when you press the shutter release.
-With the mirror out of the way the film is now directly in line with the lens but still shielded by the shutter mechanism. The shutter mechanism is now tripped resulting in the film frame being exposed via the lens.
-Once the exposure is complete and the shutter is closed the mirror, in most modern SLRs, swings back into the taking position and you can once again see through the viewfinder. This is known as an 'auto return mirror'. In older and more primitive cameras the mirror will stay in its 'up' position and so the view finder will remain black until the photographer has primed the mechanism again.
-In many vintage SLRs (and few modern ones with interchangeable finders), the image on the ground glass is directly seen from above (waist-level finder) — it's upright, but reversed (left and right). In most modern SLRs, the ground-glass image is seen through a [[Pentaprism|prism]] that resides on top of the ground glass screen. The view through the [[Pentaprism|prism]] gives you an upright, unreversed viewfinder image (eye-level finder).
-gay
-paki
-==Links==
-* [http://thispublicaddress.com/tPA4/archives/2006/05/monocular_duplex.html the Monocular Duplex, one of the earliest SLR (by Calvin Rae Smith , patent 1884)] on the Public Address [http://thispublicaddress.com/]
-* [http://www.photopentax.com/compatibilite-en.html The largest database Screw Mount M42 (lenses) compatible SLR (In english and French)]
-{{glossary}}
 [[Category: SLR|*]]
 [[Category: Camera architecture]]