Macro "filter" vs extension tubes
I am tempted to start looking into the macro photography but I do not want to invest to much into it.
So, I'd like a cheap solution, like Macro "filters" OR some extension tubes.
Q1: how does each tool influence the photo quality (the sharpness), if it does?
Q2: what would you recommend and why?
Q3: what's the difference between different extension tubes?
Why some are cheaper than others and, what should I look after when I'll buy one.
A nice video about this but, without so many details