Quote:
Originally Posted by
milosz 
Get a Sigma 30mm f/1.4 to go with your 50mm.
Learning only with a short telephoto (as the 50mm becomes on a DX body) would be a challenge.
Yes - it's a handy focal length but something wider than 50 is very useful - it will allow more experimentation with perspective for a start.
Quote:
Originally Posted by
TRINI 
The Nikon 35mm f1.8 is also a great DX lens.
+1
Quote:
Originally Posted by
JLay87 
What do you mean "to go with" my 50mm lens?
And what is a DX?
It's useful to have a wide range of focal lengths - for interiors you'll certainly need something wider.
DX is the sensor size, the D300, D200 and all of the non-professional bodies use the small DX sensor. The D700 and D3 use an FX sensor which is close in size to a 35mm film frame. In the old days of film

50mm was considered a standard lens, with 35mm the start of wide-angle. If you put a 50mm lens on a DX body it becomes the equivalent of a short telephoto (around 75mm) - basically just multiply by 1.5.
If you want an inexpensive route into trying the effect of different focal lengths look at used manual Nikkors - the 24mm/2.8 AI, 28mm/2.8 AI and 35mm/2 AI are all available secondhand relatively cheaply and work well on DX bodies and FX (dearer but giving you a little more width is the 20mm 2.8AI which works well on DX bodies, but isn't great on FX).
To see how telephotos work, both the 135mm/2.8AI and 200mm/f4 AI are very cheap and give useful focal lengths on DX sensors.
I've got modern AF lenses as well as manual nikkors, but tend to reach for the manual nikkors much more often.