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Shutter Speed
The shutter speed determines whether there is blurring as a consequence of ‘handshake’ and whether the birds in the flock are sharply defined. Generally, a shutter
speed of 1/50th s will be sufficient to eliminate handshake if you are using a 50 mm
Fig. 10 (a) An image of a Guillemot colony at Elegug Stacks in Pembrokeshire UK. A manual
count of the birds in ImageJ revealed that there are 1626 Guillemots, 1 Razorbill (Alca torda) and
2 Great Black-backed Gulls (Larus marinus) in the image. (b) is an inset from Fig. 10a but after a
manual count in ImageJ. This shows the marker that has been left on each bird to indicate that the
bird has been counted and which species it is (indicated by the marker number – 2 in this case).
These markers make it possible to avoid double counting and to avoid losing your place in the
image during the count. Camera model – Canon EOS 7D, Lens – Canon 35 mm lens, ISO 800,
F-stop – f/10, Exposure time – 1/800 s
C. Hurford
Shutter Speed
The shutter speed determines whether there is blurring as a consequence of ‘handshake’ and whether the birds in the flock are sharply defined. Generally, a shutter
speed of 1/50th s will be sufficient to eliminate handshake if you are using a 50 mm
Fig. 10 (a) An image of a Guillemot colony at Elegug Stacks in Pembrokeshire UK. A manual
count of the birds in ImageJ revealed that there are 1626 Guillemots, 1 Razorbill (Alca torda) and
2 Great Black-backed Gulls (Larus marinus) in the image. (b) is an inset from Fig. 10a but after a
manual count in ImageJ. This shows the marker that has been left on each bird to indicate that the
bird has been counted and which species it is (indicated by the marker number – 2 in this case).
These markers make it possible to avoid double counting and to avoid losing your place in the
image during the count. Camera model – Canon EOS 7D, Lens – Canon 35 mm lens, ISO 800,
F-stop – f/10, Exposure time – 1/800 s
C. Hurford