I've done more with 'documentary' types of photos (churches, structures, specific landforms), but I've tried to become more 'artistic' in a variety of ways.
- Paying more attention simply to light and dark
- Being attentive to lines and patterns
- Being very aware of composition which includes:
- Leading lines
- Foreground, middle, background
- Rule of thirds and when to break it
- Making sure there is a focal point for the picture (i.e., the thing I want people to see and to which the composition draws attention)
- Avoiding distractions in a picture
- Look for the 'story' the picture can convey
- If I'm visiting a site, look for something that captures the 'essence' of that site.
Those are all things that can be done with any lens, but some things I've discovered about lenses:
- I like ultrawide and fisheye lenses. Because of the distortion with them, I have to pay a lot more attention to composition. A slight change in the angle of view makes a big difference in perspective and distortion
- Shooting as wide open as possible. I have a nice Mamiya/Sekor 55mm f1.4 and some f1.7/1.8 50mm lenses. Shooting wide open (or nearly so) forces me to figure out exactly where the focus needs to be because the depth of field is so small. This also helps isolate the subject, so here also is where attention to attractive bokeh comes into play.
- Shoot macro! It really forces me to look at things differently.
- Shoot with just a single prime lens for a while. It forces me to 'see' things from a particular focal length. Each focal length real offers a different view of the world.
- Be directed by a 'theme' - It's amazing how much more I can see when I'm looking for something specific. It can be a color or a shape or a particular object.
With all that in mind, it is possible to be artistic with any lens, but some lenses that have helped/forced me to be more artistic are:
- Rokinon 8mm FE; DA 10-17 FE; Sigma 10-20
- DA 21
- DA 40XS
- One of my fast 50/55mms
- K50 f4 or Tamron 90 for macro
Finally, like QuartermasterJames, I think the (post?) processing is simply part of the picture taking. You can either get a lens engineered to do something specific, or you can replicate the physics when processing.