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Umm...hi. I have a Nikon D3100 with kit lens and also a 55-200mm lens. I'm thinking of buying a prime lens and is quite interested in the 50mm f/1.8G, 35mm f/1.8 and the 40mm f/2.8 micro. I don't want to buy the 50mm f/1.8D because my body has no motor and so does the lens. Which one should i buy? Which one has more value for money?