- Joined
- Jan 16, 2006
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- 5,903
Most of your other questions were answered, but the macro can focus over such a range because it tends to change length so much - at normal distances, it's a similar length to non-macro lenses, then gets longer as you get closer. (Though some may focus internally, but are still moving a lot.) My 55mm 1:1 and 105mm 1:1 almost double in length at the closest focus setting! The extra length is why you can use extension tubes and bellows to turn any lens into a macro.BUT does anyone know anything about macro lenses and how they actually work. ie why you can use them for normal distance shot and macro shot?
The issue with focal lengths is distortion - with a very short macro (like a 35mm), getting to 1:1 has you extremely close to the item - almost touching it. Obviously this gives a somewhat distorted view of the item! A longer focal length will give somewhat less distortion. One is not necessarily better than the other, they are just different tools for different jobs.