Top positive review
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Tamron AF 70-300
on 27 February 2009
The lens itself feels pretty good build quality and for the money, the optics are good too. As other reviewers have rightly pointed out, it is a little bit soft at the longer focal lengths (200-300mm), with some noticeable cyan fringe chromatic abberations. Lets face it, for £130 (or there about) you are not going to get top quality optics. If you are on a budget, as I was, you will not be disappointed with this lens. Just dont expect to be able to take razor sharp images at longer focal lengths with the clarity of a high quality apochromatic "pro" lens. In relatively low light conditions, you will find that the lens "hunts" so you have to switch to manual focus occasionally (esp if you stop down to f/8-f/11 to sharpen up at longer focal lengths). It maybe a touch noisy during auto-focusing but not too intrusive. The lens barrel rotates during focus so using circular-polarising filters can be a little troublesome but this can be overcome by focusing then switching to MF and adjusting your filter.
Good focal length for mid-range nature photography.
Reasonably fast (f/5.6 at 200-300) for a cheap lens
Sharp under 200mm
Good build quality
slightly soft over 200mm (can be rectified by stopping down to around f/8-f/11) or in CS3 post-production
Some noticable cyan chromatic abberation