Howdy, I've got an anniversary Speed Graphic with a Zeiss Tessar 135mm f/4.5 which has screw threads...only problem is, I have no idea what size.

I would like to use step rings with my existing filters or purchase filters that fit the lens. Anywhere this information is archived? I expect to purchase a 90mm lens soon. Probably Graflex or Wollensak.

Thanks,
Christopher Lockett
Cinematographer
Los Angeles

http://www.skgrimes.com/adapter/measure.htm

Explains how to measure lens threads in depth. Basically use a precision instrument to measure the inside center of the lens opening. A micrometer, veneer caliper or simular with a metric scale works best.

Charles