macro lenses are also very well suited for common photography as long as their poorer speed is not an obstacle. But with f/3.5 it can be a problem to focus on your viewing screen. Some focussing helps like microprisms or split-image rangefinders do not work at f/3.5. Its easier to focus a f/1.4 lens. The second problem is the gradient of the focussing thread. Since macro lenses are especially designed for close up work focussing at normal distances is very sensitive. Together with the darker viewfinder, the larger depth of field and the steeper thread it is more difficult to focus in darker light situations than with the f/1.4.