Larry, The type of polariser you use is dependant upon the type of metering the camera uses not whether you're using MF or AF on the camera or whether the lens rotates or not. An example would be if using a Nikon F5 (Nikons can use older MF lenses) if you fit a MF Nikkor lens to the autofocus F5 you need to fit a Circular Polariser the same as if you fit a nikon AFD lens. For your EOS 300 you need a Circular Polariser. Hope this eases the confusion! /img/wwwthreads/smile.gif<font color=blue>RonM FRIPN
oh bummer! i have a 58mm polariser that i got cheap,tho its a good un! but now i have to fork out for a circular,and they aint cheap! click,whirr,i got a free roll of HP5 and im not afraid to use it <img src="/img/wwwthreads/wink.gif">
Larry, Does the Polariser have the letters CPL on the rim/edge of the filter if so you've got a Circular Polariser if not you is stuffed and have a linear, start saving mate! BTW get the best you can afford. /img/wwwthreads/smile.gif<font color=blue>RonM FRIPN
