(I thought this would be the most appropriate place, as this isn't for any given system or adapted/native lens, but all) The question is: Is there any point keeping multiple lenses that cover the same focal length area than a single lens would? Case in point: I have these 18-50mm, 24-70mm and 28-200mm lenses, all f/3.5-5.6. I might have the opportunity to exchange these to a single 18-200mm/f3.5-6.3 lens. Do you think there are any notable pros/cons about this exchange? One definite pro I can find is that I wouldn't have to change lenses when going from wide to tele, and one con that I can find is the drop of the tele-end aperture from 5.6 to 6.3 (but that isn't so much as to actually bother me). My 28-200mm is a macro one and the 18-200mm isn't, so that might be something of a con. But I don't actually know how, since the 18-200mm will actually focus closer (45cm) than the 28-200mm does (48cm).