yong chang wrote: >The 50mm F2 may have a diameter of 45mm. Can you or someone recommend places >to get filters or step-up rings. > Good Mornin' Richard! If your 50mm Summicron has a built-in, extendable lens hood, is should have E55 filters (55mm thread). If it is the older design, with the clip-on lens hood, then the filters size is 43.5mm. Such filters are difficult (though not impossible) to find. In this case you need a #14160 filter ring (fairly readily available from B&H, amongst others) which is used to hold Series VI filters in place. Hope this helps. David. -- David Young, Logan Lake, BC CANADA. Personal Web-site at: http://www3.telus.net/~telyt Leica Reflex Forum web-page: http://www3.telus.net/~telyt/lrflex.htm ------ Unsubscribe or change to/from Digest Mode at: http://www3.telus.net/~telyt/lrflex.htm Archives are at: www.freelists.org/archives/leicareflex/