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For those of you who want to learn what these abbreviations are about, I have compiled a list of the terms used, what it stands for and of course what it will actually do for you or avoid.

General Abbreviations.

Before we get into the nitty gritty of why they are all different, let's look at the commonalities. There are three common terms to describe SLR lenses and these are simple to grasp and relate purely to more creative and performance functions.

Focal length: - The scope of the scene captured example 16-35mm. A lens which covers an area of 16mm (relatively wide) zooming in to 35mm.

Maximum aperture:- The maximum speed at which the lens can let in light. eg f/2.8 or f3.5 - 5.6

If the lens has only one number then that is the maximum aperture possible.

If the lens has 2 numbers then these are the maximum apertures possible dependent upon the focal length the lens is set to.

The lower the number the wider the lens aperture and the faster it lets in light. (see my forthcoming article on the law of reciprocity)

AF/MF: Switch between Auto Focus and Manual Focus

Canon Lens Abbreviations

Terms to describe Canon lenses

Canon produce an extremely wide range of lenses for their EOS cameras. This married with the ranges produced by Sigma, Tamron and Tokina gives Canon owners an enormous range of Canon Fit SLR Lenses. The abbreviations used by Canon are as below.

EF: Electronic Focus. Lens mount fits the entire Canon EOS DSLR range.

EF-S: As above but only fitting the APS-C sensor digital SLR such as the 20D, 30D, 40D, 50D and 300D, 350D, 400D, 450D, 500D. The S stands for "short back focus," meaning that the back of the lens is much closer to the CMOS (CCD if you like) than with EF lenses.

USM: Ultrasonic autofocus motor. Two types. USM micro-a direct replacement for the systems on older FD motors and 'Ring USM' with manual override.

DO: Diffractive optics. A technology allowing Canon to produce shorter physical length lenses.

TS-E: Tilt-shift lens used for perspective correction in photography, usually in architectural work to alter converging lines and depth of field. Similar to 'Sinar' camera.

L Lenses: Canon professional with higher optical quality and not specifically functionality. Usually white in colour. All L series lenses have a red ring on the outside..

MP-E: Macro Photo Electronic. Lenses designed for macro with an electronic aperture control function.

IS: Image Stabilisation, A system designed to reduce hand shake. Nikon version is called VR (Vibration Reduction) and Sigma one is OS (Optical Stabilisation).

Nikon Lens Abbreviations

Describing Nikon Lenses

Nikon produce a large range of lenses with their own specific acronyms. Sigma, Tamron and Tokina also make Nikon Fit SLR Lenses making the selection almost equally as wide

AF DC_ Nikkor Lenses:Defocus-image Control adjusting spherical aberration and thus the blur giving rounded blur effect used for portraits.

CRC (Close-Range Correction): Fot fisheye, wide-angle, Micro, and limited medium telephoto, offering higher quality at closer distances.

DX Nikkor: optimised for bodies with smaller sensors.

ED: Extra-low Dispersion glass. Superior sharpness and colour, correcting blue and red light travel.

IF: Internal Focusing. Lens length remains unchanged

Macro: suitable for close up focusing.

G: Aperture adjusted by the camera body.

Nano Crystal Coat: non-reflective coating for clearer images.

VR: Vibration Reduction: Nikon's version Image Stabilisation to cur down the effects of hand shake.

PC-E: Perspective Control for architectural photography.

RF: Rear Focusing for smoother auto focus..

Silent Wave Motor: Silent AF

Sigma Lens Abbreviations

Acronyms for Sigma lenses

EX: Sigma's professional lenses.

DG: For full frame bodies

DC: For APS-C bodies.

ASP: Aspherical lens.

APO: Apochromatic lens. Unique to Sigma and for chromatic aberration.

OS: Optical Stabilisation.

HSM: Hypersonic Motor. Silent AF.

RF: Rear focus..

IF: Inner focus so lens physical length is fixed reducing hand shake on longer focus shots.

DF: Dual focus. Does not rotate during AF.

Conv: Used with Sigma teleconverters.

Tamron Lens Abbreviations

Tamron Lenses described

ASL: Aspherical

AD: Reduces chromatic aberration..

Di : Full frame

Di II: Cropped Frame.

IF: Internal focus.

LD: Low Dispersion Glass to reduce chromatic abberation

Macro: Designed to focus on closer subjects

SP : Super Performance.

XR: Extra Refractive Glass for improved optical results.

VC: Vibration Control as Canon's IS, Sigma's OS and Nikon's VR.

For more information on lens acronyms and lens applications visit Park Cameras. A pro dealer who provide full UK warranty SLR Lenses.

Hi, my name is Keith Trigwell. I'm a live music photographer and I also have a passionate interest in most other types of photography, particularly portraiture and Fine Art. My live music shots can be seen at http://www.flickr.com/bigmojo

To pass the time I also write a few articles on photography and technical photographic matters.

Five Best SLR (Single Lens Reflex) Digital Cameras

Many more serious photographers are converting to SLR digital cameras for the reason that of the convenience with the aim of a digital camera offers. With a SLR, or single lens reflex, they can become qualified quality pictures with the convenience of a digital camera. There are a little SLR cameras with countless consumer reviews. Here is a look by the side of a little of the top SLR digital cameras with the aim of got a five pass? of five star rating.

Nikon D80

The Nikon D80 SLR offers 10.2 megapixels representing startling picture clarity. It has an in camera bowdlerization figure with the aim of allows you to dash up your photos truthfully on the camera. It additionally has a 2.5" color LCD and a pentaprism viewfinder with a built in diopter. It has 6 white balance modes and 6 flicker modes. It additionally has an orientation sensor and an outer flicker mount. It includes a PictureProject disc Rom and comes with many accessories. This is a quality SLR digital camera with many extras and will run you around $900.

Canon EOS 40D

This SLR digital camera skin texture 10.1 megapixels. It has a metal lens mount to accommodate other lenses. It has a 3" color LCD with a 7 level brightness control as well as a viewfinder with an bendable diopter. The Canon EOS 40D SLR has 4.8x optical zoom. It has 9 white balance modes and 4 flicker modes. It skin texture an outer flicker mount and a focus range of 2.8'-5.6'. It is PictBridge compatible and comes with EOS Digital Solution software. There are so many skin texture and accessories with this camera it is not on to catalog them all. This is a highly rated SLR camera, and worth all of the $1,500 it retails representing.

Olympus EVOLT

The Olympus EVOLT is a wonderful SLR digital camera with the aim of has 10 megapixels coupled with a Supersonic Wave Filter with the aim of eliminates dust and rubble from your shot so with the aim of you become a cloudless image each instance. It comes with two uncommon lenses and is compatible with many more. It has a 2.5" color LCD as well as a separate viewfinder. There are in excess of 16 event modes and seven exposure modes. There are seven uncommon white balance modes and a variety of flicker settings. You can even wish your own custom color special effects representing both shot. It is PictBridge compatible and comes with many accessories. This is a countless deal on a SLR camera representing just $750.

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which lens mount is used in the 35 mm camera?

1-which lens mount is used in the 35 mm camera?
2-Is through the lens metering used in a SLR?

All camera manufacturers use a proprietary lens mount. Canon lenses only mount to Canon cameras; Nikon lenses only mount to Nikon cameras, etc.

Sony DSLR cameras use the Minolta Maxxum A-mount introduced in 1985.

Pentax DSLR cameras use the K-mount introduced in 1975.

Nikon DSLR cameras use the Nikon bayonet mount introduced around 1960.

Canon DSLR cameras use the EF mount introduced with the EOS Rebel AF cameras around 1986.

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