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.

-- Douglas Moo (djmjlm6@aol.com), January 05, 2000

Answers

Douglas,

my Rondenstock catalogue shows 40.5x0.5 filter thread.

-- Daniel Taylor (aviator@agalis.net), January 05, 2000.

Yes, 40.5 appears to be the size. Check out the website at http://www.rodenstockoptics.com/viewcam_index.htm There's a chart that should help.

-- Robert A. Zeichner (razeichner@ameritech.net), January 05, 2000.

my Rodenstock catalogue agrees ...

-- Daniel Taylor (aviator@agalis.net), January 05, 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.

-- Darron Spohn (dspohn@photobitstream.com), January 05, 2000.