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Message: <blockquote data-quote="v30rider" data-source="post: 1846302" data-attributes="member: 71765">I have the D90 and have both the sigma 150-500 as well as the nikkor afs 300mm/f4 with nikkor tc-14eII. I was suprised to find that at 300mm, the sigma is quite comparable in sharpness to the nikkor prime (even wide open -f6 on the sigma pretty much equal to f5.6 on Nikkor....better than f4 on Nikkor). That really blew me away. Also found that at 420mm, the nikkor with 1.4tc is much sharper than the sigma 150-500 when using larger aperatures. For example, nikkor + tc at f6.3 is much better than the sigma at 400mm at f6.3, and at f8, but at f11 the gap closes considerably with the nikkor + tc just slightly sharper.  As far as focusing speed, the nikkor without the tc is a bit faster than the sigma. The nikkor with tc is a bit slower than the sigma. So Nikkor afs 300mm + 1.4tc pros vs sigma 150-500:- better image at 420mm at larger aperatures (so considerably faster)- excellent "macro" capability- faster AF at 300mm (ie, without the tc)- not as heavy- more convenient lens hoodCons vs sigma 150-500:- nikkor 300mm + tc is more expensive- nikkor 300mm + tc is a bit slower focusing- Nikkor prime not considerably sharper at 300mm (you'd expect it to be)- not as versatile as the sigma zoom- no image stabilization- loosing 80mm reach</blockquote>