#Distance and Aperture when Using the built in Flash.
A set criteria is necessary between the guide number,aperture and distance when shooting with the flash.
Calculate and adjust the shooting conditions if flash isn't sufficient.
Built in flash guide number.
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sensitivy / Built in flash guide number
_________________________________________//
ISO 100 / 11
ISO 200 / 15.6
ISO 400 / 22
ISO 800 / 31
ISO 1600 / 44
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#Calculating Shoting Distance from Aperture value.
The following equation calculates the distance of the flash for aperture values.
Maximum flash distance L1=Guide number + Selected aperture
Minimum flash distance L2=Maximum flash distance + 5*
*The value 5 used in the formula above is a fixed value wich applies only when using the built-in flash alone.
-X-ample
When sensitivy is [ISO 100]and aperture value is F2.8
L1=11 + 2.8=approx 3.9(m)
L2=3.9 + 5=approx 0.8(m)
Therefore,the flash can be used in a range of about 0.8m to 3.9m.
The flash can't be used when the distance is less than 0.7m.When the flash is used at closer than 0.7m ,it causes vignetting in the picture corners,light is distributed unevenly and the picture may be overexposed.
#CAlculating Aperture Value from Shooting Distance
The following equation calculates the aperture value for shooting distances.
Aperture value used F=Guide number+Shooting distance.
When sensitivy is[ISO 100]and shooting distance is 5m,aperture value is: F =11 +5 =2.2
If the resulting number(2.2,in the above example)isn't available as a lens aperture,the smaller number that is closest(2,in the above example)is generally used.
Itu rumusna kurang lebih seperti begitu(tapi pake built'nflsh
).
LOL...u org yg punya selera humor yg lumayan buruk LOL4. Apaan lagi yah ???.Anu gw punya tambahan sebelum sesi pemotretan dimulai ada baiknya kita adakan briefing dulu lalu ngececk lokasi pemotretan dan yg pertama-tama emang kudu diajak n'dho(dlm bhs Jawa)dulu,ngobrol bentar trus baru moto.
Iya itulah yg sedang diperbincangkan...IMO, dibutuhkan lebih dari skill fotografi utk bisa moto seorang model.
Maturnuwun atas komen teman2 happy posting here...




(tapi pake built'nflsh
...
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