Which does not apply to view camera lenses as some are beyond 100 years old (long before "filters" as most Photo Folks today would know were even used for photography) with some still making images today.
Projection of an expectation based on a different branch of Foto hardware and era.
Bernice
We must live in different universes Giganova. I don't own a lens new enough to have that info engraved on it. From the dark ages one learned that Leitz summicrons (35 & 50) were E39 and classic Nikons were 52mm. It's like Bernice said: "Projection of an expectation based on a different branch of Foto hardware and era."
The 180mm will serve you well! It will give you plenty of image circle to play with, too. Learning to see with it will help give you a good idea where to go next in focal length.
Step-up rings come in handy for the various filter sizes that are out there. I do not use filters often, and then pretty much limited to yellow or red. Have fun!
"Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China
Good percentage of view camera lenses used are in APO graphic arts process lenses in barrel. Many of these do not have front or rear threads for any filters. Filters to be used go into a filter slot slightly in front of or behind the aperture in barrel. This slot also allows the insertion of non-round apertures for various specific graphic arts needs..
Many graphic arts process lenses were made well into the 1990's..
Majority of soft focus lenses do not have filter threads, many have their own specific filters or add-ons that do not comply with the common Foto industry standards..
Aero-recon lenses made for aerial reconnoissance images do not have "industry filter thread sizes" engraved on them. They often have specific filters designed for a specific lens and application.
This list can be ~greatly extended~
~Customer dependent, no?~
Bernice
Can someone tell me what filter thread this lens has: Schneider 180mm f5.6 Apo-Symmar MC.
Is it 58mm?
B&H says 72mm.
https://www.bhphotovideo.com/c/produ..._Symmar_L.html
That's the "L" version, not sure if it changed. But my 150mm APO Symmar is 58mm so I imagine the 180mm is probably a bit larger, so 72mm sounds reasonable.
Edit:
https://www.foto-wolf-dresden.de/Geb...ebraucht-.html
Maybe it is 58mm. The Schneider datasheets have been removed from their site, but Oren or Dan has posted them somewhere here on the LFPF using archive.org links.
Yes it is m58 x 0,75 stated on my Schneider Katalog!
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