Thanks useful information: 
okay, back at home now. Here's a D40 shot across Lake George with the Sigma 17-70 at 70mm, and a 100% crop of the wind farm in the distance.
If you look carefully, you can see where the pixels are sagging from old age. After all, there's only six mega's worth of them, so they have to work so much harder at holding hands to keep the pikkie from falling apart.
Okay - if I hadn't told you it was 6MP, would you have been any the wiser? (and they're mid-quality jpegs to get them below the size limitations).
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