View Full Version : Small-sized filters?

Robbie Bedell
14-May-2010, 19:21
Where can one find small filters? I am looking at my old Tessar and the threaded ring measures 30mm across. They must be out there somewhere.

Vick Vickery
14-May-2010, 20:48

J. Patric Dahlen
14-May-2010, 23:27
How old is it? What camera is it on? Most cameras from the 1950's and older used slip-on filters, and the thread was only for the front element retaining ring, so screw-in filters might not fit (depending on the thread pitch).

Peter K
14-May-2010, 23:51
Either 30 x 0.75 mm screw-in or 32 mm slip-on?

As you can see here (http://www.heliopan.de/preise.shtml) screw-in filters are still aviable from 19 x 0.5 mm up to 127 x 0.75 mm.

Emmanuel BIGLER
15-May-2010, 04:20
Peter K is right to remember us that the Heliopan catalogue is a True Ali Baba Treasure Cave, but there exist another thread, very close to 30 mm, namely M30.5x0.5 which I use routinely on my Rollei-35 camera. But this is a fairly recent camera...
For an inside (female) thread, usually what you measure is close to the nominal diameter minus the thread pitch. So I would expect to measure something like 30 - 0.75 = 29.25mm for a M30x0.75, and I would expect to measure 30.5 - 0.5 = about 30 mm for a M30.5x0.5
There exist some cheap comb-shaped thread gages that costs a few dollars
and that are very helpful to distinguish between a thread pitch of 0.5 and 0.75, among the most common thread pitches for filters of diameters smaller than ~ 80mm.

Robbie Bedell
15-May-2010, 06:23
My Tessar is from 1903.

Bob Salomon
15-May-2010, 07:49
Heliopa make filters down to 19mm.

Brian Schall
15-May-2010, 09:56
Check out this site: http://www.camerafilters.com/default.aspx . Hopefully you can find a step-up adapter to a common size.