Depth of Field / Zoom
Here's a study in how the depth of field alters as one adjusts the zoom.
All photos were taken from the same spot, using a fixed aperture (F 5.6). The first two involved focusing in turn on neighbouring flowers to give a sense of the very narrow constraints on depth of field at 200 mm. Subsequent shots all focused on the forward flower.
Of note - when using the maximal zoom, exactly *what* you focus on is very important. At wide angles focusing anywhere roughly in the general area one wants will do. So no snapshots / action shots at great zoom.
F 5.6 .. 200 mm .. 1/160 sec
F 5.6 .. 200 mm .. 1/125 sec
F 5.6 .. 105 mm .. 1/160 sec
F 5.6 .. 56 mm .. 1/125 sec
F 5.6 .. 27 mm .. 1/125 sec
F 5.6 .. 18 mm .. 1/80 secoriginal jpg
