I've been thinking about getting the Nikon 50mm f1.8 AF-D prime lens for my D70. Main reason I am interested in it is the speed and perceived flexibility for lower light situations. As this lens is known to be one of the sharpest on the market and is only £79 I thought of it as a no-brainer. Unitl... I started thinking about the digital SLR lens factor, the D70 has got a factor of 1.5 if I am not mistaken which makes this lens really a 75mm. I thought the advantage of the 50mm was that it provide a view like the human eye does....So great for candid and flexibility... If my assumptions add up so far, should I rather be looking in the 28-35 range for a prime? Something like the: Nikon AF 35 f/2D Nikon AF 28 f/2.8D Nikon AF 28 f/1.4D (Only kidding, at £1700 it a bit out of my reach...) Sigma 28mm f/1.8 EX DG ASPHERICAL MACRO What do you think?