Light and Timing

A couple of shots showing the challenge of contrast:

F 10 .. 18 mm .. 1/250 sec

F 10 .. 18 mm .. 1/400 sec

The first shot is a yawn: underexposed in the nearground, overexposed in the farground. Though it's not technically perfect I like the drama of the second shot, taken a few minutes later as a cloud sailed by. The result makes the buildings pop far more, and the faster shutter speed keeps the background from fading out.

In the Field: Exposure

The cathedral of St Vitus is an imposing Gothic edifice at the castle in Prague. It is vast and gloomy: a great setting for the Addams family, but a challenge to photograph on a very bright day. So I fiddled with the exposure and got the following set of photographs:

F 10 .. 24 mm .. 1/320 sec

F 7.1 .. 18 mm .. 1/500 sec

F 7.1 .. 18 mm .. 1/200 sec

Shooting a dark building against a bright sky is difficult... and the sky gets that weird wash-out of colour closer to the (invisible) sun. Adjusting the exposure almost completely erased (overexposed) the colour of the sky, though the building's detail was far clearer. None of them great shots. For these shots the only filter used was a (UV) skylight.

Turning around and shooting a light building with my back to the sun resulted in these shots, the first at the same settings as the final shot of St Vitus above:

F 7.1 .. 18 mm .. 1/200 sec

F 7.1 .. 18 mm .. 1/1250 sec

Amazing what a difference lighting and reflective surfaces make!

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 sec
original jpg

Photo Blog

As if three blogs weren't sufficient, I've started an echte photo blog at http://baobab.aminus3.com/ - also titled Images Across The Earth. The idea here is to post a shot a day, which may be a challenge since I tend to have a python approach to photography. It's probably good discipline to keep one's eye in: I'm just starting to get back to composition after focusing on pushing the edge of the technical envelope with the new lens.

The difference between the Aminus3 ["A minus 3"] blog and the original IATE blogger blog is that the former is really designed to show off individual photographs, while the latter is intended for story-telling, supporting the travelogue. I think they'll complement one another.

Stay tuned for some thoughts on the recent shots on A-3. I intend to upload more of the best archive shots once I dig out the source files.

Shadow Birds

In addition to the unattractive but technically interesting photos of geese on the kaleidoscope water, I got some cool shots of silhouetted birds. My favourites are posted on Images Across The Earth.

The in-flight shots were technically tricky because the light was fading rapidly, the birds were some distance away, and they were moving fast.

Compare the detail below with the second shot in the gallery, which was taken twenty minutes earlier.

F 11 .. 200 mm .. 1/60 sec
(detail)

Technical specs for the gallery shot: F 13 .. 135 mm .. 1/200 sec (detail). The increased shutter speed and different angle captured individual feathers in motion rather than a full-wing blur.

I also got some interesting shots of birds on the water. At a glance the first gallery shot looks as though it is a single bird with its shadow/reflected in the water, but in fact there are two birds:

F 5.6 .. 200 mm .. 1/60 sec
(detail)

Technical specs for the gallery shot: F 5.6 .. 200 mm .. 1/80 sec (detail). The two shots were taken in rapid succession.

Finally, a detail that shows off more of the 18 - 200 lens' capabilities:

F 7.1 .. 170 mm .. 1/60 sec
(detail)

Click the image to see the full-size version. The camera did a fantastic job of capturing the reflected light and texture of the water. Note the concentric ripples around the righthand bird, overlaid on the river's natural weave. This is a full-width version of the original shot, simply cropped to remove the less interesting foreground/background that was out of field.

Dizzy Ducks (actually geese)

This time, a couple of dizzying shots using the 18 - 200 mm lens.

The bokeh gets noticeably more intense at greater zoom, in this case exacerbated by the reflected light, the moving water and the slow shutter speed (VR accommodates camera vibration, not a moving environment).

At an extreme this could be used to make deliberately artsy photos. A faster shutter speed and polarizing filter would have flattened the photos into dull shots of geese.

F 5.6 .. 135 mm .. 1/30 sec
original jpg

F 5.6 .. 200 mm .. 1/30 sec

original jpg

More (18 - 70) River Shots

A little later that afternoon, still with the 18 - 70, I took a series of shots varying the aperture.

The interesting thing here is the comparison with the 18 - 200 mm lens in terms of bokeh and vibration blur. I'll have to take the two lenses out and do an apples-to-apples comparison of identical shots.

Notes:
F5.6 - bright (red, yellow) colours render best but bokeh is distracting.
F9 - probably the best shot overall: you'd get a similar effect using the camera's landscape program.
F14 - slower shutter speed results in obvious vibration blur: 18 - 200 VR would solve this.

F 5.6 .. 70 mm .. 1/125 sec
original jpg

F 9 .. 70 mm .. 1/100 sec
original jpg

F 14 .. 70 mm .. 1/50 sec
original jpg

F 14 .. 70 mm .. 1/30 sec
original jpg