By The Green

Nikon D70 @ 18 mm, 1/2 sec, f/3.5, ISO 200
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Recognise these tower blocks? ;) Unfortunately they have suffered from blown highlights in this shot, but I like it enough to post it all the same. From this I learnt that I should start looking at the histogram more often when reviewing shots, and try to learn what it's telling me. Also, try and work out how to get more even exposures with this filter...

In answer to Curlytoes' comment below, the filter blocks out all but infrared light. My limited reading on the subject tells me that infrared light is reflected brightest by clouds and foliage, while water and blue sky absorbs most of it (hence white leaves and dark skies/water). This results in a considerably longer shutter speed than normal, which is why a tripod is generally needed for wide landscape shots with a deep depth of field (f-stops in the region of f/8 upwards would be particularly tricky without some stabiliser for example). If it's a bright day it helps, but those days can be few and far between in Britain. Increasing the ISO isn't recommended as the noise seems to be even more noticeable in the shot, and only gets worse in post-processing (although Noise Ninja comes in very handy there).