Yes, I'm still doping out the various intricacies of the series filters, and am resigning myself to just getting the correct Leica filters and retaining rings from eBay or elsewhere. There is a polarizer that would be perfect for the 135 Elmarit, since it's Series VII size, catalog #13359. But I can't tell whether this is a circular polarizer or linear, and I need a circular for the SL2. Does anybody know? If this isn't circular, I assume there is a circular polarizer that's appropriate for this lens, so I'd appreciate that information. Same question applies for the first version of the 50 Summicron and 35 Elmarit, both of which take Series VI -- which circular polarizer works here? Thanks very much! Nick ------------------------------------------------------------------------------ NOTICE: The information contained in this electronic mail message is confidential and intended only for certain recipients. If you are not an intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication and any attachments is strictly prohibited. If you have received this communication in error, please notify the sender by reply transmission and delete the message without copying or disclosing it. ==============================================================================