New Nikon 50mm 1.8g for Dx cameras?

I want to buy the new 50mm 1.8g for my d90, but i understand that it won't be 50mm because my camera is dx format it would be like 75mm focal length. I was wondering if i should still buy it? Or should i just buy the 35mm 1.8?

Well Joseph it depends on you. 35mm is semi wide angle for shooting in tight spaces like a kids birthday party in the kitchen. There's lens distortion like a magnifying glass distorts with the 35mm. I rarely used a 28mm or a 35mm lens. If you take pictures of people or street scenes then the 50 is ideal. The 50mm was the standard lens in my day (the 1960s) to give realistic reproduction of what you see with your eye. I do would choose a 50 or even 75mm lens with a higher appateur of maybe 2.8. I mean what would you really take a picture of with 1.8 f-stop? I rarely ever got below f2.8 in over thirty years. Your choice but I would give the nod to the 50 or spring for a 85mm (if you shoot portraits allot of people, it makes people more comfortable that you are not in their face and stand back a bit. )

I assure you. It will still be 50mm no matter if it's DX or not. The only thing is that on your camera, the 50mm lens will "behave" like a 75mm lens on a 35mm film SLR or full-frame dSLR. Focal length does not change. Angle of view does due to the film sensor size. If you are after a normal or standard lens, you should get a 35mm lens. If you are after a 50mm lens, well then get the 50mm lens.

Bro, I would invest in the 35mm 1.8G AF-S honestly. Why? Because I have the 50mm 1.8D (old version) I would always be constantly asked to take a photo of a group of people and It's a pain always trying to back up because it isn't so wide. It's practically the same thing but the 35mm 1.8G AF-S is just a better every-day lens.

It will behave just like your kit lens when it's set to 50mm, as focal lengths are directly comparable.

It also behaves like a 75mm lens does on a full frame or film camera, but on such a camera one wouldn't use a 18-55mm kit lens either, but rather a 28-80mm one (well… One wouldn't use a cheap kit lens on a $2500 D700, but that's a different matter).

Anyway, i have both the 35mm/1.8 and the 50mm/1.8 and i almost exclusively use the 50mm one. It's perfect for portraits, and with the slightly longer focal length allows for somewhat shallower depth of field than the 35mm prime (which already can get nicely shallow DoF too).
The 35mm prime is too much of a compromise in terms of focal length for my liking. It certainly has its uses, like group shots, but it's too long for most landscape work and too short for single person portraits.

Simple. If you own a D90 you probably have a zoom lens with it that can do both 35 and 50mm. Try it and see which one you prefer. The 35mm and 50mm f1.8 lenses will produce the same viewing angle, they just open further and are a touch better optically.

Just buy it. It's a nice lens. The mm difference is just a step away.