Photography trivia thread ("Did you know thread")

[bhason]

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Hi! post tag mga trivia diri arun malingaw pod ta ug basa2x about photography.

I just read this by surfing the internet about the famous photographer Annie Leibovitz

Did you know that celebrity photographer Annie Leibovitz's first learned to shoot as a kid in the former Clark Airbase, Pampanga? Her father was in the service and the family was based there during the Vietnam War.

And also have you noticed the "love hurts" photo by lee? kana bitaw dako nga mga billboard gipang post sa dalan?
It was taken by a point and shoot camera.

check out this link Winner of 40,000 USD in Lee Make History campaign photo contest is from the Philippines | Calvin's Hub

post pod mo arun malingaw tag basa2x.

[radiostar]

^^

katong lee contest.. one of the finalist kay rip off gikan sa dev art....

[szichri]

Why Canon has white lenses? First, the "white" color of the longer Canon L lenses is not white, it is more along the lines of beige to light gray.

The first is that, for several different very technically sound reasons, temperature swings are bad for lenses. Some materials used in some L lenses are more temperature sensitive. Canon has managed to get the flourite glass it uses to be more tolerant of heat, but it's still really brittle as well. A lens (any lens, with any lens elements) can be designed, built, and calibrated at any temperature in which it will continue to function. One of the characteristics of fluorite is that gas bubbles can form inside it if the temperature exceeds 50°C - 55°C. Canon went to the white barrels after having problems with some of their very early fluorite lenses.

But the further you get from this "calibration" temperature the less well it will perform. Light colored objects absorb heat energy less quickly in the sun. So a lens calibrated to work at an average daily temperature will experience smaller, and slower, temperature swings when used in direct sunlight. Why do they not make all L lenses light colored then? This effect is more pronounced with longer focal lengths and with zooms. Also, focal lengths over 200mm are seldom used in the studio...where the light colored lens might possibly cause reflection issues.

The second reason is, quite naturally, marketing. When you see all those big light colored lenses at a prefessional sporting event or a motor event most photographers immediately think "Canon". While the technical reasoning may be strong, Canon would be stupid not to also be thinking of the marketing and brand recognition value.

Heat impacting thermal expansion of the optics was the main reason, but photographers were also complaining about the lens barrels being too hot to hold comfortably. Canon had to do this due to the type of glass they were using in their first generation L lenses. Just happened to become their signature look.

Eh bakit ang Nikon meron ding white lenses? Nikon called it Gray Lens as opposed to Canon. The reason? Nikon's ED glass does not suffer from this problem, but the heat can cause metal components to expand and slightly shift the focus of the lens. That's why long lenses focus past infinity, to allow the focus to be corrected for expansion of the lens barrel.

[Chipmunk888]

Why Canon has white lenses? First, the "white" color of the longer Canon L lenses is not white, it is more along the lines of beige to light gray.

The first is that, for several different very technically sound reasons, temperature swings are bad for lenses. Some materials used in some L lenses are more temperature sensitive. Canon has managed to get the flourite glass it uses to be more tolerant of heat, but it's still really brittle as well. A lens (any lens, with any lens elements) can be designed, built, and calibrated at any temperature in which it will continue to function. One of the characteristics of fluorite is that gas bubbles can form inside it if the temperature exceeds 50°C - 55°C. Canon went to the white barrels after having problems with some of their very early fluorite lenses.

But the further you get from this "calibration" temperature the less well it will perform. Light colored objects absorb heat energy less quickly in the sun. So a lens calibrated to work at an average daily temperature will experience smaller, and slower, temperature swings when used in direct sunlight. Why do they not make all L lenses light colored then? This effect is more pronounced with longer focal lengths and with zooms. Also, focal lengths over 200mm are seldom used in the studio...where the light colored lens might possibly cause reflection issues.

The second reason is, quite naturally, marketing. When you see all those big light colored lenses at a prefessional sporting event or a motor event most photographers immediately think "Canon". While the technical reasoning may be strong, Canon would be stupid not to also be thinking of the marketing and brand recognition value.

Heat impacting thermal expansion of the optics was the main reason, but photographers were also complaining about the lens barrels being too hot to hold comfortably. Canon had to do this due to the type of glass they were using in their first generation L lenses. Just happened to become their signature look.

Eh bakit ang Nikon meron ding white lenses? Nikon called it Gray Lens as opposed to Canon. The reason? Nikon's ED glass does not suffer from this problem, but the heat can cause metal components to expand and slightly shift the focus of the lens. That's why long lenses focus past infinity, to allow the focus to be corrected for expansion of the lens barrel.

roger.


thanks for sharing.