Puncher
November 9th, 2005, 04:52 PM
Often it is written on the lens (on the front), as part of the whole labeling there. Also the box/documentation of the lens should have that information. If you don't have that, you should be able to find that info on the Internet/manufacturer's homepage. Of course you could also try measuring, but you have to be relatively exact there.
From which lens do you want to know the thread size?
From which lens do you want to know the thread size?