I still have the orginal 35-80 that came with an old film Rebel-S. Also have two old zooms from that era... are they 70-200 or 80-200... plastic mount stuff. Old. Still work fine! The one zoom totally clouded on an early morning outing, and when it cleared up... a sort of residue was left behind on one of the elements. Not worth fixing, so I bought another for $99 new. Ha~ The flare caused by the residue makes that zoom "perfect" for portraiture now. Sort of like a Softar I from Zeiss.
Oldest metal mount lens... 28/2.8. My 50/1.4 focus died and that was replaced too.... but the 28's been doing well since the mid 1990's.
Your clouded zoom gives an interesting angle to the story, I didn't know about the Softar filters. Thanks
5D3, 5D2, Sony α6000, G16 | SY14 f/2.8, Ʃ20 f/1.8, 24 f/2.8, 35 f/2, Ʃ35 f/1.4A, 50 f/1.8 I, Ʃ50 f/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200 f/2.8L IS II, 1.4x II, 2.0x III, 70-300L | E-mount: SY12 f/2, 30 f/2.8 EX DN, 16-70 ZA OSS, 55-210 OSS, Metabones SB | FT-QL, AE-1P | FD(n) & FL lenses