Hi all,


I had started a thread some time ago asking opinions between choosing extension tubes and a close-up lens (see here).


I have a few some follow-up questions on the 500D (the close-up lens, not the camera!):


- Are there any disadvantages to using it with a step-up ring? (I'm probably going to get the 77mm one to use on my 24-105, but I would also like to be able to use it on my 70-200 f4 IS that has a 67mm thread)?


- Would it make sense to use it on my 70-200 in conjunction with the 1.4x extender (would that increase magnification at all)?


- Are there any (good quality!) alternatives to the 500D in 77mm filter size? I somehow doubt it, given that Nikonians also seem to use the 500D, so it's considered very good. But, I thought I'd ask.


Thank you very much in advance for all your help!


Tony