Digital Imaging with Hasselblad 33
Single-Shot and Multi-Shot
All Hasselblad digital backs and digital cameras can be used in the single-shot mode which
is standard on digital cameras and is illustrated in Figure 3-5. Single shot means recording a
single image on the sensor just as we record a single image on fi lm. This is a very satisfac-
tory digital imaging approach that produces good image quality and is usable for any type of
subject, stationary or moving, in any fi eld of photography recorded with a handheld camera
or from a tripod.
The CF-39 and CF-22 digital backs are also available in a multishot version that increases
the fi le size and dimension and reduces the noise problem and problems with moiré even fur-
ther. A capture with the CF-22 in the 4-shot mode is 134 MB dimension 5440 4080 pixels
and in the 16-shot mode 515 MB dimension 10880 8160.
As the name indicates, in the multishot mode you record several identical images, the
CF-22 offering the option of 1, 4, or 16 shots, the CF-39 1 or 4. The sensor in the camera
has pixels that are covered by a color fi lter array making some pixels record only red,
others green, and still others blue. In the single shot mode, 25% of the total pixels record red,
25% record blue, and 50% are used to record green. In the multishot mode the camera takes
several identical pictures but with the sensor moved in 1 pixel increments in between each
shot for a 4-shot mode or ½ pixel for a 16-shot mode available only on the 22 MS back.The
4-shot mode is illustrated in Figure 3-6.
In the multishot mode all pixels in the sensor record red, all pixels record blue, and all
pixels record the green image. In a 22 Mpixel sensor with 4080 5440 pixels, we now have
22 Mpixels of red information, 22 Mpixels of blue information, and 22 Mpixels of green thus
producing the utmost in digital image quality for still lifes, architectural work, product photog-
raphy, and copying where utmost image sharpness is a prime requirement. Multishot mode is
a function of the software and is completely controlled by the FlexColor or Phocus software
and is described in detail in the FlexColor and Phocus instruction manual. It can be done
only with the camera connected to a computer. Multishot mode is mostly used with studio
fl ash and the time delay between shots, which can easily be a number of seconds and may be
determined by the time that is necessary for recharging the fl ash.
Since a multishot capture is a multiple exposure, it must be made with a tripod-mounted
camera and I also suggest using a sturdy tripod to eliminate any possible camera vibrations.
The lighting situation also must be very stable between shots.
Figure 3-5 Single shot operation. A single shot system delivers one color per pixel.
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