haha so it would be much better to be on a 50mm f/1.8 II? thanks for the details and price people! eh is it possible or sensible to get a closeup filter on my 75-300 III USM? how much would it cost me? and what size must i get? how to read from the lens what size to get?
Look for 'ø 58mm' on your lens somewhere around. That means the lens has a filter thread of diameter 58mm. Similarly if a lens has a 77mm filter thread diameter, you'll see 'ø 77mm' somewhere on the lens.