YYV_146
Well-known
I've never owned a Noctilux so this is just based on what I've read online. However, reviews I've seen say it is decent in the centre wide open but soft at the edges. Bokeh is OK in the centre and strange at the edges. It's obviously fast but I don't see where the high-performance (speed aside) comes in. The lens blocks around a fifth of the field in the viewfinder. It may be excellent stopped down but so are many lenses!
You can get much the same optical performance from, say, a 50mm (same focal length) f1.2 Zuiko for around £300 as opposed to what a Noctilux costs so about 5% rather than 2.5%. OK, you're around a half-stop slower but you get not far off 100% viewfinder coverage as compensation. I would certainly expect the Noctilux to perform a little better than the Zuiko (don't know, just guessing) but I'm sure the Zuiko would deliver around the same overall performance in terms of sharpness and bokeh (the Olympus has better bokeh) and DoF.
Please don't think I'm knocking the Noctilux: it's a magnificent beast. I'm just saying that those of us on a more restricted budget needn't feel like we have to miss out on anything.
Performance degrades significantly only at the outermost 20% of the frame, which IMO wouldn't be in focus anyways. The lens is very nearly as good as the 50lux ASPH at F1.4, with similar Bokeh and overall sharpness. The Bokeh argument may be true, as I can see many pre-asph lenses with better bokeh than modern designs (Mandler 90mm f2 verses 90 Apo ASPH).
I can't see the point of using super-fast lenses on an M. The RF mechanism can get knocked out of alignment, and with my glasses I find it very difficult to judge precise focus with the RF patch. If I am using an M I would have stayed with a slower 50 - I use EVF cameras, which allow precise focus and free composition by zooming in on any part of the frame. There are, of course, also no blockage issues.