Monday, 17 October 2011

Canon EF 70-200 F4 L IS Lens Review

!±8± Canon EF 70-200 F4 L IS Lens Review

Canon EF 70-200 F4 L IS, one of famous telephoto lenses of the photography world today, is comprised of 4 main important parts which are lens construction, a lens body, IS (Image Stabilizer system) and an aperture. I have been using this lens for awhile and I would like to share my review into 4 important parts as listed below.

Firstly, the lens construction is composed of 15 lens groups and 20 lens elements with a filter diameter of 67 mm and it has a focal length range from 70 mm to 200 mm. Moreover, there are 2 UD (Ultra-low Dispersion) lens elements and 1 fluorite lens element which help dramatically light dispersion, color balance, image sharpness and a vignette while minimizing ghosting and flare. It has the closet focusing distance of 1.2 m and the maximum magnification of 0.21 m. It is used for dispersing light reflected from objects into an image sensor in a camera.

Secondly, with a total weight of 760 gram, the lens body has a diameter of 76 mm and a length of 172. It has a strong white magnesium alloy case with black rubber cover at a zoom ring and a focal ring and a red ring showing as the Canon professional lens, called L-series lens, around a front part of the lens. It is used to protect the lens elements, the aperture, dust and moisture from outside.

Thirdly, the aperture is made of 8 circular diaphragm blades. Its maximum aperture (F-Stop number) is 4 and its minimum aperture (F-Stop number) is 32 throughout all focal length. Moreover, there is no an aperture ring at the back of the lens so the aperture must be adjusted by the camera only. Its functions are for controlling the amount of lighting coming into the image sensor and depth of field.

Finally, IS (Image Stabilizer system) contains a special gyro system which shifts lens in the gyro system in the opposite direction of hand shaking both x-axis and y-axis in order to compensate vertical and lateral movement of hands while taking photos. Consequently, the motion of IS will cancel out hand shaking directions and the light coming into the image sensor will be steady. It is very useful when photographers would like to take photographs in low shutter speed condition and it gives an equivalent effect of shutter speed approximately 4 stops. With the IS, it helps considerably photographers get sharp images in low shutter speed condition.

In conclusion, the 4 main important parts of the Canon EF 70-200 F4 L IS lens which are the construction, the lens body, the IS (Image Stabilizer system) and the aperture make this lens as the outstanding professional telephoto lens.


Canon EF 70-200 F4 L IS Lens Review

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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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