от: Величайший Дракон ранее известный как Пушер
И это будет уже не Лейка.
... уважай классику, чувак!
Про лейки. Для лейководоф.
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Re[Величайший Дракон ранее известный как Пушер]:
... уважай классику, чувак!
Re[Schnappi das Kleine Krokodil]:
от: Schnappi das Kleine Krokodil
?
Я имел ввиду компании Leica Geosystems и Leica Microsystems. Та, что AG конечно производит еще бинокли и пр. Но я отвечал в контексте разговора о "распаде" AG.
Re[f_graph]:
от: f_graph
Я имел ввиду компании Leica Geosystems и Leica Microsystems. Та, что AG конечно производит еще бинокли и пр. Но я отвечал в контексте разговора о "распаде" AG.
А что тут подразумевалось под "распадом ляйки"?
Re[Schnappi das Kleine Krokodil]:
от: Schnappi das Kleine Krokodil
А что тут подразумевалось под "распадом ляйки"?
Распад Leica AG. Подумал, что Вы имели ввиду как раз не AG: про бинокли и всякую ерунду, в которой у Лейки уйма крнкурентов не подумал. Сорри.
Re[Величайший Дракон ранее известный как Пушер]:
Вот если бы внутри не было сенсора, который устарел уже на момент выхода - ещё можно было бы о чём-то говорить. А так...[/quote]
не устaрел a был выбрaн пo неoбхoдимoсти если хoчеш мoгу ссылку прислaть, -прaвaдa тaм пo aмерикaнски:(
Re[Val P.]:
от: Val P.
Вот если бы внутри не было сенсора, который устарел уже на момент выхода - ещё можно было бы о чём-то говорить. А так...
не устaрел a был выбрaн пo неoбхoдимoсти если хoчеш мoгу ссылку прислaть, -прaвaдa тaм пo aмерикaнски:([/quote]
... please :)
Re[Carpenter]:
от: Carpenter
... please :)
плиз-в смысле не нaдo п-ть или в смысле ссылку? :))
Re[Val P.]:
Solving the corner vignetting problem
Because a rangefinder camera doesn't have a mirror box doesn't need to use retrofocus lenses, meaning they sit much closer to the film (or in this case the sensor). The problem with this comes with wide angle lenses (which are pretty much the main staple of the rangefinder camera). Towards the corner of the frame the angle of incidence of light coming from the rear of the lens is so severely off-perpendicular that they would not pass equally through the microlenses above the sensor leading to fairly strong vignetting. Even a modest wide angle lens at this kind of distance could produce a difference of a stop or two between the center of the frame and the edges using a standard CCD sensor.
Leica, obviously keen to solve this problem, took a three pronged approach with the M8:
Don't use a full frame sensor - at this time it would be cost prohibitive and too complex to produce a sensor which can cover the entire 36x24 mm frame and still work with rangefinder lenses. For this reason the M8's sensor measures 27x18 mm (or 1.33x crop).
Use offset microlenses - instead of placing all microlenses directly over the photodiode they are gradually offset as you get closer to the edge of the frame (see below).
Know which lens is being used and apply some software correction - all new M series lenses now carry a six-bit code which allows the M8 to identify which lens is used and (optionally) apply a 'final stage' software based vignetting correction (for RAW images the lens used is simply recorded, no change is made).
http://www.dpreview.com/articles/leicam8/
Because a rangefinder camera doesn't have a mirror box doesn't need to use retrofocus lenses, meaning they sit much closer to the film (or in this case the sensor). The problem with this comes with wide angle lenses (which are pretty much the main staple of the rangefinder camera). Towards the corner of the frame the angle of incidence of light coming from the rear of the lens is so severely off-perpendicular that they would not pass equally through the microlenses above the sensor leading to fairly strong vignetting. Even a modest wide angle lens at this kind of distance could produce a difference of a stop or two between the center of the frame and the edges using a standard CCD sensor.
Leica, obviously keen to solve this problem, took a three pronged approach with the M8:
Don't use a full frame sensor - at this time it would be cost prohibitive and too complex to produce a sensor which can cover the entire 36x24 mm frame and still work with rangefinder lenses. For this reason the M8's sensor measures 27x18 mm (or 1.33x crop).
Use offset microlenses - instead of placing all microlenses directly over the photodiode they are gradually offset as you get closer to the edge of the frame (see below).
Know which lens is being used and apply some software correction - all new M series lenses now carry a six-bit code which allows the M8 to identify which lens is used and (optionally) apply a 'final stage' software based vignetting correction (for RAW images the lens used is simply recorded, no change is made).
http://www.dpreview.com/articles/leicam8/
Re[Val P.]:
от: Val P.
плиз-в смысле не нaдo п-ть или в смысле ссылку? :))
ссылку, конечно. thanks
