40mm filter-threads for vintage rangefinder lenses

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Some older vintage lenses for rangefinder cameras have a rare 40mm filter thread. Do not mix/confuse this with 40.5mm (a lot of vintage rangefinder lenses use 40.5mm). Canon decided for a number of their lenses to use a 40mm thread size to mount filters. Since these lenses were made a long time ago, and almost nobody uses that size/pitch anymore, filters and hoods are hard to find nowadays. Do not try to put on 40.5mm filters/hoods on a 40mm thread, as you WILL screw up your filter threads. This page goes into detail of which lenses use those thread size, what solutions there are out there, and what modern options are available.

Rangefinder lenses which have 40mm filterthreads:
  • Canon 25/3.5 LTM
  • Canon 28/2.8 LTM
  • Canon 35/2 LTM
  • Canon 35/1.8 LTM
  • Canon 50/1.5 LTM
  • Canon 50/1.8 LTM (the brass/chrome one, not the later black body version!)
  • Canon Serenar 50/1.9 LTM
Adapters:
  • Period correct: Ednalite 617 40mm to Series VI (rare)
  • Period correct: Ednalite 705 40mm to Series VII (rare)
  • Period correct: Tiffen #603 40mm to Series VI (rare)
  • Period correct: Tiffen #721 40mm to Series VII (rare)
  • Period correct: Canon 40mm to Series VI (rare)
  • Period correct: Canon 40mm to Series VII (rare, for the canon 50/1.5)
  • Modern: Generic step-up adapter 40mm to 40.5mm
  • Modern: Generic step-up adapter 40mm to 39mmm
  • Modern: Generic step-up adapter 40mm to 43mmm
Filters:
  • Period correct: Walz used to make 40mm filters (search eBay)
  • Period correct: Original Canon filters (search eBay) – they are really nice, and have an extremely low profile.
  • Period correct: Marumi used to make 40mm filters (search for Marumi 40f)
  • Modern: Just search eBay/Amazon for 40mm filters, they are usually black, but are new
Hoods:
  • Period correct: Canon lens hood for 50/1.5 (rare), not really a hood, but an adapter for 40mm to a large Series VII filter, and that has a Series VII hood.
  • Period correct: Canon also made clamp-on hoods for their 40mm filter thread lenses, which could be an alternative, as some of them provide options for a Series VII filter in there.
  • Period correct: Walz & Hoya supposedly made 40mm hoods as well, but we have yet to hold those in our hands
  • Modern: Fuji lenshood, LH-X10. These are around 60 USD/EURO, however can be found as replicas for as cheap as 5 euro/dollar.
Useful links with more information: