What size filter fit Voigtlander Apo Lanthar 150mm lens?

[yadong110]

Anyone know the appropriate filter for an Linhof select APO Lanthar 150mm lens ?
Thinks.

[Steve Hamley]

This size:

http://silverbased.org/series-filters/

Cheers, Steve

[Arne Croell]

Voigtländer LF lenses (at least post-WWII) were built for slip-on filters not for threaded ones. The visible threads are for the retaining rings; if a threaded filter like a series filter fits, that is by accident. The slip on filter diameter for the 150mm Apo-Lanthar was 42mm.

[yadong110]

Thinks Steve & Arne.

[gchu1970]

The thread filter size should be 40mm. I use a 40-49mm adaptor so that I can use the normal 49mm filters.