Originally posted by myjohnson
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i dont even bother with tamron and sigma because i think they are not better than canon on lens...only non canon lens i would consider would be carl zeiss...but they are super expensive...and most of their lens you have to go with a converter mount to put on a canon or nikon body...that means MF only.. thats just my opinion tho..
one thing too...i dunno if nikon are like canon...if d90 is a aps-c body..and if their 105mm marco is a regular lens but not one design for the aps-c body..your will not get 105mm...but instead like maybe somewhere around 150mm...canon are like that..not sure about nikon...
i prefer buying lens locally...because i can test it out...not all lens are perfect out there...even brand new ones...there are lemons...those wont focus right...or focus shifting...then it will have to send it back to nikon to calibrated it...which is pretty trouble...even more be careful with second hands...the exterior of the lens may looks perfect...sometimes people drop it on carpet...or something like that...you wont see any scratch outside...but sometimes inside will be bad...
there are tools that can test the accuracy of the focus of the lens...
its like a little stand that you make with paper...there are marking on the stand which you focus on and test shot..
i have it if you want it than i can send it to you..
its a pdf file which you just print it off and make it yourself..

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