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Message: <blockquote data-quote="crycocyon" data-source="post: 282074" data-attributes="member: 13076"><p>Thanks, and with your D3100, you would have effectively a 1.5x increase in effective focal length, so a 900mm f5.6 (!!). So you could spend $18,000 on a Nikon 800mm f5.6, or spend as much as $1500 on this setup (that's actually what the lens and converter cost me....with more beat-up lenses you could spend probably around $1000), and get an extra 100mm reach. Of course you wouldn't have the incredible sheer quality of the Nikon 800mm, but we'll see how this combo performs in the field. And focusing this lens manually is very fast actually. I could focus with it indoors with medium tungsten light levels, not very bright, so on a sunny day this would be a breeze to focus I think.</p></blockquote><p></p>