Originally Posted By: DWallach
50mm with macro tubes and a 100mm is that you have the zoom difference, i.e., how close you need to be to the target to take a picture at a given level of magnification.


So, essentially one would prefer a 100mm macro lens over a 50mm macro lens because of the practical advantage of obtaining the same level of magnification by being more far away from the subject, in all those occasions when this is beneficial (e.g: macro of insects).

But, what is the difference between a 50mm macro and a 50mm non-macro lens? Is that difference the reason why you're saying I could get an extension tube if I had a "standard" 50mm (which I actually don't)? Wouldn't the extension just change the focal lentgh?
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