9th July 2004, 02:23 PM
How do you convert 200mm, 1:4 mag ratio to 1:1 terms. I just want to know what my half-XXXX 28-200mm 1:4 macro lens is equivalent to in terms of a true macro lens. Does this make sense?
10th July 2004, 11:20 AM
for ta 200mm lens to get 1:1 for non-IF lens:
=> length of extension tube to add-on=200mm minus max extension at closest focus
i.e. if your max extension at closest focus is 85mm, then u need to add on another 115mm of extension tube to get 1:1.