The Lens you have owned the longest and still do.

[Jason Greenberg Motamedi]

A 16.5cm f4.5 Zeiss Tessar in Compur mounted to a rickety Korona, given to me by a Great Uncle in 1986.

[Scott Walker]

150mm Rodenstock Sironar-N 5.6
Purchased in the late 80's

[Preston]

210mm, Schneider-Kreuznach, f-4.5, Copal 3, since 1980.

--P

[BrianShaw]

Symmar-S 210 bought in 1980.

ditto, plus a 135 bought at the same time.

[cyberjunkie]

A 90mm Angulon, with original Linhof cam, which came on a Technika III 5th version, which i purchased more than 25 years ago (mid eighties).
The lens and the camera are a couple years older than me

Then there is a Voigtlander Heliar 210mm on Compound, which came on a wonderful Fatif 13x18 camera, with a rectangular rack and pinion monorail, which has extensions with rapid slide-in joints (spring/sphere system). That Fatif was my second camera, it came a few months after the Technika.
I just sold the Fatif for peanuts, to a young photographer approaching large format.
The camera has a one-of-a-kind design, which allows to store it flat in a very small backpack, without removing the bellows.
I kept the lens though, i think that the Heliar will stay with me for a LONG time.

have fun

CJ

[Eric Rose]

Sorry to say my oldest lens that I still have was bought in 1974 and is the venerable and oft maligned Nikkor 43-86 zoom. I must have got a good copy because mine is wonderful to use.

[dsphotog]

In 1972 my mom bought me my first camera, it was a Minolta srT102 with a 50mm f1.7 lens, for my high school photo class.
The camera was stolen in 1987, ten years later, I was working at a local camera store, when a guy (not the thief) came in with my lens, I told him the story & he gave me the lens.

[David R Munson]

The LF lens I've had the longest I've had less than a year, but for lenses in general it would be a Mamiya 80mm f/1.9 that I've had about 10 years now. I get the feeling that it would also be the last lens I ever let go of.

[leighmarrin]

My longest-owned lens is a 50mm Leitz f1.5 Summarit, and my second-longest-owned lens is a 50mm f2 Russian Jupiter-8. The Summitar came with my first real camera, a Leica IIIf given to me in 1970 by a cousin who bought it in an army PX in Korea. When I got the Russian lens a few years later, I mostly used it instead--so much more lighter and did not protrude as far into the IIIf's viewfinder. The Russian lens was not quite as sharp at most settings as the Leitz, but it also focused much quicker.

My longest-owned LF lens is a 1960s 135mm f4.7 Xenar, bought around 1985. Comparing it to a slightly scuffy Ektar 127mm at f8 and f11, I was surprised to find the scuffed-up Ektar was sharper in the center. (Yes, I refocused for the 8mm length distance.) But I use the Xenar more, as it's the only LF lens I own that has a modern PC plug for flash synch, and it's quite sharp enough for my small enlarged prints.

[Michael Graves]

Mine would be the 300mm Fujinon that came with the Toyo 810M I bought from Trevor Stanley (Arizona Highways photographer) back in 1985. Still have the camera, tripod and lens that were part of that package.