35 1.4, any of the higher end options are excellent but its the goated lens imo
Photography
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Pentax FA 50/1.4.
Potentially: Pentax HD 43/1.9 Limited, but I just bought it yesterday so I don’t know yet.
Both lenses go on all my digital and 35mm film SLRs due to external “screwdriver” AF and manual aperture ring.
Sony 24 GM or the 35 GM
Sigma 105mm f/1.4
Carl Zeiss Jena Biotar T 58mm f/2
Zeiss 35mm f/2.8 ZM or Noctilux. Zeiss is the sharpest lens I’ve shot, and the Noctilux bokeh (esp. with Christmas lights in the background) is such an iconic look. I’ve wanted a Noctilux ever since I read this article a decade ago https://www.reddotforum.com/content/2014/10/bokeh-kings/
50 1.2
15mm f1.7 pana-leica MFT
Sony 24 to 70 2.8 GM II
70-200. There no beating that telephoto compression, especially for landscape photography.
Tamron 60mm f2 macro
Canon 50mm 1.4 LTM.
Sony 135 1.8 GM
30mm f-1.4
You'll get 50-60 years max. Also you won't live forever
Zuiko 12-40mm f/2.8
Zeiss Otus 55mm F1.4 just perfect
The Bokina. Vivitar Series 1 90mm f2.5 (1:2 and comes with 1:1 adapter). Beautifully made, solid as a rock, sharp as a tack and relatively cheap. I've used it on a Canon 5D, Sony A7 and currently the Olympus EM-1 Mkll. The only lens that is always in my bag.
Nikon 18-140mm. Lots of range. It's the one I almost always use.
24-120 F4. All in one for Nikon
Call it a copout answer, but since OP didn’t specify it has to be real:
12-400mm f/2 fisheye macro tilt-shift with interdimensional optics that allow the whole thing to be packaged for the size of an 85mm f/1.8. Metal mount, metal filter threads, 3 stop image stabilization, and optically sharp corner to corner even wide open.
Either my Nikon 80-200 ED or 85 1.8G
24-90
Helios 58mm
Probably a zeiss 50mm f/1.4
Sigma 18-35 f1.8, so crispy!
My 50mm 1.2 for Nikon. A tank, a dream, a delight.
Some 28mm equivalent f/2 (or faster) lens.
The pancake Canon RF 15-600 f/1.2, but apparently Canon hasn't released it yet.
Helios 44m 58mm f/2, best lens i've ever used
5-5000 f0.5
honestly the 24-105 f4L is an extremely versatile lens, with image stabilization. i have much more expensive lenses but always come back to this one.
Schneider-Kreuznach 35mm f3.5I love me some standard/wide glass. Granted, it’s not very wide in 35mm format, but it’s oh-so-lovely.
My Canon 100-400mm Mk II Honorable mention Canon 70-200 f/2.8 MkII Canon 200mm f/1.8
Nikon 80-200, 2.8, ED, zoom, extraordinary glass, hyper clear and built like a tank.
85mm 1.2
50mm f/1.2 with no doubt
Nikkor 55/1.2 AI. It’s my most used lens.
XF50mm F1.0WR
35 mm prime. Anywhere between f/1 and f/2.8, I don't care which, just let me keep one.
Probably a Sigma 50-500. While it's not the sharpest lens around, it would be the most versatile.