I'm new to this, just got a Nikon D3200 and am learning to use it. I think I'm looking for the same lens as you. This is the info that I found. Tamron 70-300 might be just as good, but for less money?
[TD="bgcolor: transparent"][TABLE="class: diffs, width: 784"]
[TR="bgcolor: transparent"]
[TH="bgcolor: transparent, colspan: 8, align: left"][h=3]Reasons to consider the Tamron 90mm f/2.8 SP Di Macro Nikon-f[/h][/TH]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"]Is a prime lens[/TD]
[TD="bgcolor: transparent, align: right"]
Yes
[/TD]
[TD="bgcolor: transparent, align: center"]vs[/TD]
[TD="bgcolor: transparent"]
No
[/TD]
[TD="bgcolor: transparent"]
[/TD]
[TD="bgcolor: transparent"]Prime lenses have a single focal length, they are typically sharper and have wider apertures[/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"]Significantly more magnification[/TD]
[TD="bgcolor: transparent, align: right"]
1:1 (1x)
[/TD]
[TD="bgcolor: transparent, align: center"]vs[/TD]
[TD="bgcolor: transparent"]
1:2 (0.5x)
[/TD]
[TD="bgcolor: transparent"]
[/TD]
[TD="bgcolor: transparent"]Take macro shots with subjects 2x larger in your photo[/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"]Wider aperture[/TD]
[TD="bgcolor: transparent, align: right"]
f/2.8
[/TD]
[TD="bgcolor: transparent, align: center"]vs[/TD]
[TD="bgcolor: transparent"]
f/4
[/TD]
[TD="bgcolor: transparent"]
[/TD]
[TD="bgcolor: transparent"]At its widest, the 90mm f/2.8 SP Di Macro Nikon-f captures slightly more light, 1 f-stop[/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent, colspan: 9"]
[/TD]
[TH="bgcolor: transparent, colspan: 8, align: left"][h=3]Reasons to consider the Tamron 70-300mm f/4-5.6 Di LD Macro Nikon-f[/h][/TH]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"]Significantly better telephoto[/TD]
[TD="bgcolor: transparent, align: right"]
300 mm
[/TD]
[TD="bgcolor: transparent, align: center"]vs[/TD]
[TD="bgcolor: transparent"]
90 mm
[/TD]
[TD="bgcolor: transparent"]
[/TD]
[TD="bgcolor: transparent"]Around 3.5x more reach, less perspective distortion[/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"]More zoom[/TD]
[TD="bgcolor: transparent, align: right"]
4.3x
[/TD]
[TD="bgcolor: transparent, align: center"]vs[/TD]
[TD="bgcolor: transparent"]
1x
[/TD]
[TD="bgcolor: transparent"]
[/TD]
[TD="bgcolor: transparent"]Around 4.5x more zoom, giving you more flexibility for photos[/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"]Slightly better wide angle[/TD]
[TD="bgcolor: transparent, align: right"]
70 mm
[/TD]
[TD="bgcolor: transparent, align: center"]vs[/TD]
[TD="bgcolor: transparent"]
90 mm
[/TD]
[TD="bgcolor: transparent"]
[/TD]
[TD="bgcolor: transparent"]More than 20% better wide angle[/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"]Slightly cheaper[/TD]
[TD="bgcolor: transparent, align: right"]
$192.84
[/TD]
[TD="bgcolor: transparent, align: center"]vs[/TD]
[TD="bgcolor: transparent"]
$459.95
[/TD]
[TD="bgcolor: transparent"]
[/TD]
[TD="bgcolor: transparent"]The best price we've seen is $267 cheaper (2.4x less)[/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent"][/TD]
[TD="bgcolor: transparent, colspan: 9"]
[/TD]