| Joined: | Mon Apr 2nd, 2012 |
| Location: | South Lakeland, UK |
| Posts: | 4066 |
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The 50mm f1.8 is indeed considered a prime although I tend to refer to them as non zooms, but then I'm a bit old fashioned...
I might suggest a 105 f2.5 AI lens which is MF but a superb lens, usually pretty cheap and is ex film days, therefor FX compatible in case you eventually decide to go FX. DX lenses aren't ideal FX but will work.
Another classic is the 300 f4 which is a superb lens, which on a DX like the D3100 gives you the equivalent of a 450mm f4 which is pretty handy for wildlife and not too slow. (by slow I mean small aperture).
To me a really wide lens is important, I used to have a Sigma 10-20, which is a brilliant ultra wide and can be very useful.
Not sure if the D3100 has auto ISO but if it has that allows you to set the shutter and aperture to whatever you need and let the camera decide the exposure via the ISO.
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Robert.