There are two main kinds of 40.5mm filter threads.
1. 40.5mm with 0.5mm pitch (40.5x0.5)
This is an old and quite popular thread in the past for rangefinder film camera lenses. I have several lenses with 40.5x0.5 filter threads: the Industar-26M, the Steinheil Quinon 50/2, the Meyer-Optik Helioplan 40/4.5, the Staeble-Lineogon 35/3.5.
2. 40.5mm with 0.75mm pitch (40.5x0.75)
This is a thread of modern compact lenses. My Olympus M.Zuiko Digital 14-42/3.5-5.6 has this filter thread.
However, if you want to buy a modern lens accessory with a 40.5mm filter thread mount, it is quite difficult to determine its thread pitch (0.5 or 0.75) in advance.
For example, there are both versions of 40.5mm-52mm filter step-up adapters. But sellers don't know the exact pitch of the adapter they sell.
These are my two 40.5mm-52mm adapters (Noname, made in China):
The left one is 40.5x0.75, the right one is 40.5x0.5. Both have no pitch information.
The 40.5x0.75 adapter is mounted on the Steinheil Quinon 50/2, only one rotation is possible due to the wrong pitch:
While the 40.5x0.5 adapter fits well on the Steinheil Quinon 50/2:
The good thing is that the 52mm filter thread has a 0.75mm pitch for old and new lenses/accessories. So with these 40.5mm-52mm adapters I can use very old and very new filters.
See also related notes:
Image albums:
0 comments:
Post a Comment