I am saving to buy true macro lens for D80 and have a generic question related to macro lens, as I never seen/used one. There are many options like Nikkor 105mm VR (735$), Nikkor 60mm F2.8G (449$), Tamron 90mm F/2.8 (390$) etc. When these lens says 60mm, does this means that I always have to be at distance from subject which is equivalent to 60mm focal length? Specification on 60mm says that closest focus distance is 18.5cm. So I would imagine, I can really get close to subject to get finer detail, but I dont see zoom ring on any of these lens either. So how does these lens exactly work? Also 2nd question - I dont have money to get Nikkor's 105mm, but if I was to choose between Nikkor 60mm and Tamron 90mm, which one would you suggest?
With macro-lenses you don't zoom closer you just focus closer.
As a rule of thumb: if f is the focal length (say 60mm) then you can shoot an object at 2xf (in this case 120mm) from the front lens to get 1:1 magnification.
This also tells you the major difference between a 90mm and a 60mm macro lens: With the 90mm macro you can keep a larger distance to your subject which might be convenient or simply practical.
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