Originally posted by urssu As I said, I am a complete novice at this, so the term `focal length` ain' t that well set in my mind.
Originally posted by urssu I take instant shots. Be it of the city, of the water flowing, of rain poring down an umbrella (as you may see in my unappealing album) , I don' t have a `thing` regarding pictures. Don' t kill myself with macros, no do I kill myself with landscapes.
I see you have a K5 with 18-55 and 50-200 lenses. One way to become familiar with focal lengths is to shoot with those zooms, see where you set them, and see what the images look like. If you find yourself mostly shooting at 50mm or 55mm, then any of the 50-55-58mm lenses mentioned would be fine. The SMC-M or SMC-A 50/1.7, or the Takumar 50/1.4 or 55/1.8, are exceptionally good lenses. The 50/1.7s and 55/1.8 will be sharp with the aperture wide open. The 50/1.4 will be just as sharp when stopped-down to f/2, and wide-open it can get shots the others can't. The 50/1.4 is almost my most-used prime lens.
Some basics of focal lengths: On your K5, 28-31mm are 'normal', giving about the same view as you have when you close one eye. 35mm gives a slightly narrower view. 50-60mm are short telephotos, good for half-body portraits or for just picking out people on the street. 18-24mm are wide, good for what we call 'context', shooting your surroundings. All of these are popular for different sorts of street and portrait and landscape and abstract and other photography.
I personally find that 28mm gives the most 'natural' view; 18-24mm are most suitable for casual walkaround shooting; 50-55mm are great for people-shooting; 90-135mm help you isolate a subject from their surroundings. Again, try your zooms at different focal lengths, and see what works for you. One trick: Set a zoom to a certain focal length, like 24 or 28 or 35 or 50 or 80 or 135, and TAPE the lens there so it won't change. Then shoot with that focal length for a few days -- become familiar with it. Good luck!