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 | EF: SY14/2.8, V20/3.5, 24/2.8, 35/2, Ʃ35/1.4, 50/1.8, Ʃ50/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200/2.8L IS II, 1.4x II, 2.0x III, 70-300L, T28-300 Di VC PZD | E: SY12/2, 35/1.8 OSS, 16-70 ZA OSS, 55-210 OSS, SY300/6.3 ED UMC CS, Metabones SB | Vintage FD & FL glass.