I would say to only buy lenses when there is a need, That will make you very proficient with the lenses that you have. For about 5 years I only shot with a normal lens. 50 on 135 and 80 on 6x6. Finally I had a valid reason for a wide a few years back and have shot with it and learned its uses. a few months ago I needed a tele and now use it and still learning it's strengths and weaknesses. but it really makes you use the lenses to there beat ability and let's you brain do less thinking and just let the images make themselves.