Originally posted by jasonpgc
How about $150 on a 190 tripod & head so that you can always use your 28-80mm at f8 or f11 for better image quality.
Try to practice on your 28-80mm at only 50mm (least distortion). If you're comfortable with that, then can buy the 50mm f1.8 for $150. This lens will give you bitting sharpness even at f2.8, and of course, better colour.
BTW even the 28-105 suffers from distortion at 28mm and 105mm. If you are look for colour and quality, nothing is better than a cheap prime lens that is designed for a particular focal length.
2X TC for 28-80mm is fine as long as you stick to f8, this mean that the actual aperture you'll be using will be around f16. Which also means that you'll have to use a fast film or a tripod to steady your shot. But make sure you buy one that has 7 elements ($170). However, 160mm is not going to get you those huge egg yolk sunset, you'll need at least 200mm-300mm. So forget about the TC until you've a lens with a bigger aperture, eg, 100mm f2.
Like ck has mention, make sure you shot enough film to jusitify the need to purchase better equipment. It's passion, persistent and lots of patience that differentiate between a pro and a armatuer, not just the equipment.