338
THE HASSELBLAD MANUAL
Dedicated Flash Exposures for Film and Digital Imaging
Although dedicated fl ash provides consistent exposures in the simplest possible way, there
are a few facts you must know and understand to obtain the best possible results.
The sensor in all Hasselblad dedicated fl ash cameras measures the light refl ected off a
40 mm center area of the image plane. The subjects that need to be properly exposed by the
fl ash must be in that center area, as is usually the case. This is seldom a problem because the
measuring area is rather large.
At present the Hasselblad dedicated fl ash systems are adjusted for the refl ectance value
of fi lm surfaces (OTF). There are slight differences in fi lms, but they are small and need not
be considered. Nevertheless, you may want to make your own test with the fi lm that you
are using. In digital imaging, the fl ash light is refl ected off the sensor which has a different
refl ectance value than fi lms. You need to make the recommended adjustment of 1
2
/
3
f
stops
but evaluate the histogram carefully as sensors may differ and change. This compensation
is not required when using a Hasselblad digital back on the H camera. The camera adjusts
automatically for the difference in refl ectance values. This is discussed further a little later in
this chapter under Dedicated Flash in Digital Imaging.
Subject Color and Brightness
The fl ash sensor in a dedicated or automatic fl ash system is adjusted for 18% refl ectance and
produces perfect exposures only when the subject refl ects 18% of the light, as the colors in
the 0 column on the chart (Figure 15-6) in the exposure section do (see Figure 18-3). The
subject brightness must be considered if the subjects within the 40 mm fl ash metering circle
Figure 18-3
Flash tests. (1) The fl ash sensor in the camera is adjusted for 18% refl ectance. Bright
subjects turn the fl ash off earlier, creating underexposure; dark subject areas do the opposite.
(2) The new Hasselblad rear covers have a center area that refl ects the same amount of light
as the fi lm and can be used for checking whether fl ash illumination is suffi cient.
Содержание Digital Camera
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Страница 2: ...The Hasselblad Manual ...
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Страница 165: ...Heidi Niemala Editorial photograph made with a 50mm lens in the basement of a pre Civil War building ...
Страница 166: ...Heidi Niemala Photographed for clothing designer with a 150mm lens ...
Страница 167: ...Heidi Niemala Editorial portrait with a 150mm lens ...
Страница 168: ...Heidi Niemala Photographed with a 50mm lens during a sand storm at White Sands ...
Страница 198: ...Jonathan Exley An attention creating image of mult time Indianapolis 500 winner Helio Castroneves ...
Страница 200: ...Jonathan Exley Lifestyle Designer Kathy Ireland Courtesy of kathyireland com ...
Страница 243: ...Marco Grob Singer Alvin Chea from theTake 6 band photographed with an HC 2 8 80mm lens on an H camera ...
Страница 244: ...Marco Grob A make up test shot made with an HC Macro 4 120mm lens on an H camera ...
Страница 247: ...Marco Grob The Stairs photographed in CapeTown for Glamour magazine with an HC 3 5 50mm lens on an H camera ...
Страница 312: ...Raya High jewlery photograph produced with an HC 3 2 150mm lens on an H camera Raya Photographer ...
Страница 381: ...366 THE HASSELBLAD MANUAL Chart A2 Area coverage in inches with single extension tubes for the 6 4 5 film format ...
Страница 383: ...368 THE HASSELBLAD MANUAL Chart A4 Area coverage in inches with single extension tables for the 33 1 44 2 sensor ...
Страница 385: ...370 THE HASSELBLAD MANUAL Chart A6 Area coverage in inches with combinations of tubes for the 6 4 5 film format ...
Страница 387: ...372 THE HASSELBLAD MANUAL Chart A8 Area coverage in inches with combinations of tables for the 33 1 44 2 sensor ...
Страница 397: ...Chart D Close up charts for 80 to 250mm Hasselblad lenses an 503 and other V system SLR cameras based on the film format ...
Страница 398: ...Close Up Photography on Film or Digital 383 ...
Страница 400: ...Jonathan Singer ...
Страница 401: ...Jonathan Singer ...
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