Sunday, 30 October 2011

DSLR Camera Lenses and Their Abbreviations

!±8± DSLR Camera Lenses and Their Abbreviations

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.


DSLR Camera Lenses and Their Abbreviations

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Thursday, 13 October 2011

Canon's D60 Digital Cameras

!±8± Canon's D60 Digital Cameras

Nick Muskovac, PPSA Palm Harbor, FL wrote very interesting article about Canon`s D60 digital camera. His article is inspired by individual experience and observation.

Author is active user of canon digital cameras. First one he had was Canon D 30. Comparing the canon D30 with D60 Mr. Muskovac finds than, the major difference is that the D60 has much more pixles - 6.3 million pixels which beats the D30 with 3.25 million pixels.

He emphasis that D60 is using the CMOS which draws less power and therefore the camera can shoot more pictures on one battery than most Point-and-Shoot cameras without the loss of image quality.

The major specifications in Mr. Muskovacx` are:

D60 Specifications:

Type: Single Lens Reflex; 36 bit full color; CMOS direct imaging sensor

Compatible lenses: All Canon EF lenses

Lens focal length: 1.6 X indicated lens focal length

Imaging element: High sensitivity high resolution large single plate CMOS sensor

Effective sensor size: 22.7 X 15.1mm

Effective pixels: 6.29 million pixels (3072 X 2048)

Aspect ratio: 3:2

LCD monitor: TFT type color LCD monitor

Picture size: 1.8 inch

Recording method: Media--CF card (type I or II)

Formats: JPEG, RAW

Auto focus type--AF

Focusing points: 3 point (1 + 1)

AF working range: EV0.5 to EV18 (ISO 100)--This is a big improvement over the D30 with a range of EV2 to EV 18.

Focusing modes:

(1) One shot AF: AF locks when focus is achieved

(2) A1 servo AF: Tracks subject movement until the actual start of metering

(3) A1 focus AF: Automatically switches between one-shot AF mode and A1 servo AF.

(4) Manual focus: Manual focusing can be used when focusing mode switch on lens is set to manual focus (M)

Exposure control: 35-zone SPC and TTL open Metering

(1) Evaluative metering

(2) Center partial metering (approx. 9.5% of viewfinder area)

(3) Center weighted average value metering

Exposure modes:

(1) tv (time value) Shutter speed priority

(2) av (aperture value) Aperture-priority

(3) Auto depth of field priority

(4) Full Auto mode

(5) Manual mode

ISO speed range: Equivalent to 100, 200, 400, 800, 1000

Exposure compensation:

(1) AEB +/- 2 stops in 1/2 or 1/3 stop increments.

(2) Manual compensation +/- 2 stops in 1/2 or 1/3 stop increments.

Shutter type: Vertical travel focal plane shutter with all speeds controlled electronically.

Speeds: 1/4000 to 30 seconds. Bulb, and X-sync at 1/200 second.

Self-Timer: Electronically controlled, 10-second delay.

Drive modes:

(1) Single shot

(2) Continuous

(3) Self-timer (10 sec)

Number of continuous images:

Approximately 3 images/second; In One Shot AF mode at 1/250 second or faster, to a maximum of 8 images.

Built-in flash type:

Retractable E-TTL autoflash and auto popup flash.

Guide No. 39 at ISO 100 (ft.)

Recycling time: approximately 3 seconds.

Power Supply: operates from one BP-511 Battery Pack (lithium ion battery)

Number of images that can be taken with a fully charged battery:

540 (50% flash, normal temp.)

Camera Body

Flash contacts:

(1) Accessory shoe: X-sync contacts

(2) Sync terminal (with locking thread) on lower corner of camera body.

External flash system compatibility: Compatible with E-TTL auto sync.

In my opinion, the D60 camera's most valuable specification and feature is, that it will take all of Canon's EF (auto focus) lenses.

This was a very important consideration for me since I already own Canon EOS equipment and the following EF lenses:

20mm 2.8 28-135 IS 4.5/5.6

100mm 2.8 macro 75-300 IS 5.6

70-200mm2.8 100-400 IS 5.6 300mm 2.8

Putting the camera in action he took few shots and analyzed the quality of the pictures. He used the Canon 100mm 2.8 macro lens. Then he explains "Its focal length is 160 mm when mounted on the D60, an ideal macro lens. I use a twin macro flash, which I have been using for years with my EOS 1N. I shoot in the manual mode with this flash, using the guide number to gauge the distance. The shutter speed of the camera is set to 1/200 sec. I vary the f-stop depending on the distance of the butterfly from the imaginary film plane. The f-stop is generally varied between f16 and f25. When the distance to the subject exceeds 1 1/2 feet, I change the ISO setting from ISO100 to ISO200 instead of opening up the aperture. In this manner I could still use a small aperture value and maintain a good depth of field. With the D60 and 6.3 million pixels, I was able to make a very good 10 X 15 inch print using the largest jpeg image storage mode. Figure 1 shows a Coolie Butterfly taken at ISO200, 1/200 sec, f22, and a distance of about 2 feet".

When he used evaluative metering on the snowy egrets against a green background, the egrets were overexposed. Then he concludes that "the same is true to a lesser extent when using Center Partial Metering and Center Weighted Average. To get the proper exposure on the White Egrets, an exposure compensation of -2/3 to -1 stop was used in the evaluative metering mode. I shoot most all my pictures using the evaluative metering mode".

He pays attention to file numbering systems. We may choose from: (1)Continuous. (2) Auto reset. In the Continuous mode the numbering is continuous between cards. Then he points that Canon software assigns the folder numbers. The image number in each successive folder picks up where the previous folder left off, thereby providing consecutive numbering of images. The time/date is also permanently stored with each image file. Convenient storage functions allows to place Images in folders in groups of 100.

In the Auto reset mode the number resets to 0001 each time you insert a new card.

The D60 image numbering system only goes to 9900. It would have been nice to allow for 100,000 images. Heavy shooters will shoot more than 10,000 images in a year.

Here is an example of how the folder and image numbers work:

Folder Image Range

CANON100 IMG_0001 to IMG_0100

CANON101 IMG_0101 to IMG_0200

CANON102 IMG_0201 to IMG_0300

CANON198 IMG_9801 to IMG_9900

CANON200 IMG_0001 to IMG_0100

CANON201 IMG_0101 to IMG_0200

By keeping images in different folders, duplicate image file names can be identified and then renamed if necessary.

The D60's has nice 1.8 inch TFT color LCD monitor, It allows us to review your images right away.

Important is his comment about the battery life Usualy with 50% flash use and review mode on, he usually can perform between 350 and 400 images on one fully charged battery. He concludes "Reviewing the images does use a significant amount of battery power".

According to the author following features of the D60 that I consider important:

1. D60 can use all Canon EF lenses.

2. Changing ISO settings in mid-roll.

3. Review your picture :immediately after making the exposure.

4. Having a built in 1.6 X extender.

5. Shooting 3 images per second and up to eight continuous images.

He gives the D60 a good grade. Most of all he is impressed with the image quality. According to him "the camera has interchangeable Electronic Focus lens capability, and multiplies your long lenses by a factor of 1.6X. Overall it looks that the D60 is a great camera


Canon's D60 Digital Cameras

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Wednesday, 5 October 2011

Canon EF-S 60mm f/2.8 Macro USM Digital SLR Lens for EOS Digital SLR Cameras

!±8± Canon EF-S 60mm f/2.8 Macro USM Digital SLR Lens for EOS Digital SLR Cameras

Brand : Canon | Rate : | Price : $449.00
Post Date : Oct 05, 2011 17:42:07 | Usually ships in 1-2 business days


A thoroughly modern design that's optimized for select Canon EOS digital SLRs. Its angle of view is equivalent to a 96mm lens on a 35mm camera, with a floating optical system that can focus down to full life-size (1:1) magnification. Inner focusing, driven by a silent and powerful ring-type USM, means the lens' overall length never changes during focus. This lens is a wonderful multi-purpose lens that's equally at home shooting macro shots, portraits or available-light photos. Like all Canon EF-S Lenses, its use is restricted to the EOS 20D, EOS Digital Rebel and EOS Digital Rebel XT cameras.

More Specification..!!

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