douglas_j._moo1 Posted January 5, 2000 Share Posted January 5, 2000 I bought used a Rodenstock Sironar-N 1:5.6 135 mm MC lens. By my very imprecise measurement, the filter thread diameter appears to be either 39 mm. or 40.5 (probably the latter). Can anyone confirm the size of the filter thread on this lens or point me to a database where I could find such information? Thanks for any help. Link to comment Share on other sites More sharing options...
daniel_taylor1 Posted January 5, 2000 Share Posted January 5, 2000 Douglas, <p> my Rondenstock catalogue shows 40.5x0.5 filter thread. Link to comment Share on other sites More sharing options...
robert_a._zeichner Posted January 5, 2000 Share Posted January 5, 2000 Yes, 40.5 appears to be the size. Check out the website athttp://www.rodenstockoptics.com/viewcam_index.htm There's a chart that should help. Link to comment Share on other sites More sharing options...
daniel_taylor1 Posted January 5, 2000 Share Posted January 5, 2000 my Rodenstock catalogue agrees ... Link to comment Share on other sites More sharing options...
lightcraftsman Posted January 5, 2000 Share Posted January 5, 2000 And my 40.5 to 49mm step-up ring fits perfectly on my Caltar II-N 135/5.6 (same lens). Looks unanimous. Excellent lens, by the way. Link to comment Share on other sites More sharing options...
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