Indeks
One of the basic theories of photography to mention that every time down the aperture one stop, means reducing the volume of light (coming through the lens) as much as half. Conversely, if we widen the aperture one stop, means increasing the volume of light as much as twice of before. The explanation is as follows Diaphragm Figures obtained from the comparison between the lens focal length and diameter of the lens surface that serves to collect light. (F / stop = F / o)
So, if the lens has a diameter of 50 mm (diameter = diameter of the lens (glass) instead of the filter holder diameter) 50 mm wide as it is said he has a diaphragm f / 1 (50 mm: 50 mm). This is a very powerful lens collects light and is currently only produced by a camera manufacturer (Canon). From here can be calculated - using a normal lens with maximum aperture f / 1.4 - how much the diameter of the lens used to collect light. 50 mm: f / 1.4 = 35.7 mm (Rounding of .......)²² 35.7142857 When we realize that light is responsible for collecting the entire surface area of the lens is concerned, these calculations become more attractive again. Junior still remembers the lessons that formula to find the area of a circle is equal to πr ² (pi r squared)? Or 22 / 7 times the radius times the radius? So, if the radius of the lens diameter 50 mm f / 1.4 is 17.85 mm (35.7: 2) then the lens surface area is π x 17.85 ² = 3.1415926535897932384626433832795 x 318.6225 = 1000.982105268413896122063591389 mm ² (rounded up to 1001 mm ²) When we reduce the aperture one stop to f / 2, kemampua collect cahya of the lens in question to be down by half. With diaphragm f / 2, the virtual diameter of the lens was "converted" to 25 mm (50 mm: f / 2). The radius of these lenses to 12.5 mm Surface area (virtual) lens in question becomes π x 12.5 ² = 3.1415926535897932384626433832795 x 156.25 = 490.87385212340519350978802863742 mm ² (rounded to 491 mm ²) Why not be half? Did not have 491 mm ² mm ² half of 1001? Keep in mind that in photography there are a lot of rounding and compromise. 491 mm ² figure is very close to half of the 1000 mm ². Besides a wide margin 9 mm ² will be very little difference in the results of shooting. However, if you're still curious, too, we see just why it is not really made half (500 mm ²). If so, count us back into 500 mm ²: π = 500: 3.1415926535897932384626433832795 = 159.15494309189533576888376337251 The root of 159.15494309189533576888376337251 is the radius of the lens, ie 12.615662610100800241235747611828 mm From here the numbers obtained as 25.231325220201600482471495223657 mm diameter. f / stop lens in question is 50 mm: 25.231325220201600482471495223657 = F / 1.9816636488030055066725143825606 The question now is, muatkah row of numbers is to be written on the band width of the diaphragm that cute? Moreover, is not it very obvious now that the actual f / 1.98 onwards it was very close to f / 2? We continue with the following aperture, namely f / 2.8 all to show more about rounding and compromise earlier. Virtual diameter of 50 mm lens at f / 2.8 is 50mm f / 2.8 = 17.85 mm (From 17.857142857142857142857142857143) His fingers were 17.85: 2 = 8.925 mm Surface area: π x 8.925 ² = 3.1415926535897932384626433832795 x 79.655625 = 250.2455263171034740305158978472 mm ² Or 250 mm ². Uhapir half of the previous surface area and a quarter of the area on the diaphragm permyukaan f / 1.4. With the formula above, the surface area at f / 4 is 122.71846303085129837744700715936 mm ² (rounded to 123 mm ² once again almost half of previous) The surface area of the lens diaphragm to the diaphragm from one another ranging from less than half (if understated) or twice (when raised) from the previous value. In conjunction with shutter speeds, it seems pretty clear that by reducing the volume of the light half (-1 stop) automatically takes twice as long (+1 stop), and vice versa, by doubling the volume of light, the time needed also becomes faster two fold. Then, do you know that there are several versions about the true meaning of the f / stop? F / stop (small f) can mean one below.
abbreviation of the fenestra (Latin) meaning "window" (defined aperture diaphragm that forms a "window" for cahya to enter through the lens).
Abbreviations of the function (function) or fraction (fractional)
Symbols of the focal length (focal length) divided by the diameter of the opening (aperture)
From a legendary photographers (Ansel Adams) who felt the form of the letter 'f' for the aperture diaphragm is more "beautiful" and "arty" than the American standard of writing that was popular in the early twentieth century ago (eg, U.S. 1 to f / 4, US4 to f / 8, and so on).
Whichever you believe, he explained the word "stop" symbolizes the shift of the diaphragm aperture to another stopping point on the bracelet has a regulatory
sumber
So, if the lens has a diameter of 50 mm (diameter = diameter of the lens (glass) instead of the filter holder diameter) 50 mm wide as it is said he has a diaphragm f / 1 (50 mm: 50 mm). This is a very powerful lens collects light and is currently only produced by a camera manufacturer (Canon). From here can be calculated - using a normal lens with maximum aperture f / 1.4 - how much the diameter of the lens used to collect light. 50 mm: f / 1.4 = 35.7 mm (Rounding of .......)²² 35.7142857 When we realize that light is responsible for collecting the entire surface area of the lens is concerned, these calculations become more attractive again. Junior still remembers the lessons that formula to find the area of a circle is equal to πr ² (pi r squared)? Or 22 / 7 times the radius times the radius? So, if the radius of the lens diameter 50 mm f / 1.4 is 17.85 mm (35.7: 2) then the lens surface area is π x 17.85 ² = 3.1415926535897932384626433832795 x 318.6225 = 1000.982105268413896122063591389 mm ² (rounded up to 1001 mm ²) When we reduce the aperture one stop to f / 2, kemampua collect cahya of the lens in question to be down by half. With diaphragm f / 2, the virtual diameter of the lens was "converted" to 25 mm (50 mm: f / 2). The radius of these lenses to 12.5 mm Surface area (virtual) lens in question becomes π x 12.5 ² = 3.1415926535897932384626433832795 x 156.25 = 490.87385212340519350978802863742 mm ² (rounded to 491 mm ²) Why not be half? Did not have 491 mm ² mm ² half of 1001? Keep in mind that in photography there are a lot of rounding and compromise. 491 mm ² figure is very close to half of the 1000 mm ². Besides a wide margin 9 mm ² will be very little difference in the results of shooting. However, if you're still curious, too, we see just why it is not really made half (500 mm ²). If so, count us back into 500 mm ²: π = 500: 3.1415926535897932384626433832795 = 159.15494309189533576888376337251 The root of 159.15494309189533576888376337251 is the radius of the lens, ie 12.615662610100800241235747611828 mm From here the numbers obtained as 25.231325220201600482471495223657 mm diameter. f / stop lens in question is 50 mm: 25.231325220201600482471495223657 = F / 1.9816636488030055066725143825606 The question now is, muatkah row of numbers is to be written on the band width of the diaphragm that cute? Moreover, is not it very obvious now that the actual f / 1.98 onwards it was very close to f / 2? We continue with the following aperture, namely f / 2.8 all to show more about rounding and compromise earlier. Virtual diameter of 50 mm lens at f / 2.8 is 50mm f / 2.8 = 17.85 mm (From 17.857142857142857142857142857143) His fingers were 17.85: 2 = 8.925 mm Surface area: π x 8.925 ² = 3.1415926535897932384626433832795 x 79.655625 = 250.2455263171034740305158978472 mm ² Or 250 mm ². Uhapir half of the previous surface area and a quarter of the area on the diaphragm permyukaan f / 1.4. With the formula above, the surface area at f / 4 is 122.71846303085129837744700715936 mm ² (rounded to 123 mm ² once again almost half of previous) The surface area of the lens diaphragm to the diaphragm from one another ranging from less than half (if understated) or twice (when raised) from the previous value. In conjunction with shutter speeds, it seems pretty clear that by reducing the volume of the light half (-1 stop) automatically takes twice as long (+1 stop), and vice versa, by doubling the volume of light, the time needed also becomes faster two fold. Then, do you know that there are several versions about the true meaning of the f / stop? F / stop (small f) can mean one below.
abbreviation of the fenestra (Latin) meaning "window" (defined aperture diaphragm that forms a "window" for cahya to enter through the lens).
Abbreviations of the function (function) or fraction (fractional)
Symbols of the focal length (focal length) divided by the diameter of the opening (aperture)
From a legendary photographers (Ansel Adams) who felt the form of the letter 'f' for the aperture diaphragm is more "beautiful" and "arty" than the American standard of writing that was popular in the early twentieth century ago (eg, U.S. 1 to f / 4, US4 to f / 8, and so on).
Whichever you believe, he explained the word "stop" symbolizes the shift of the diaphragm aperture to another stopping point on the bracelet has a regulatory
sumber
