Kowa 8.5mm prime - Sep 20 release

Started Sep 1, 2014 | Discussions thread
tradesmith45 Senior Member • Posts: 1,621
Vignetting Re: Kowa 8.5mm prime

BTW, take a look at the LensTips review of the Samyang 10 mm f/2.8 ED AS NCS CS on a 50D: -2EV vignetting.  So the f2.8 lens is really T5.6 at the edges.

Looking at the chart, when mounted on M43, vignetting will still be over -1 EV from a lens designed for APSC. I can live w/ that but it means totting a 580g 86.0 mm × 76.7 mm lens.  A lens designed for M43 only would likely be smaller & have worse vignetting.

Vignetting & egg shape distortion are just part of the physics of UWA. The shorter the FL & larger the aperture, the bigger these problems become.  Solving vignetting would require a really huge lens.

The chart of the Kowa lens shows over a dozen elements so its already large & heavy w/ whatever vignetting it produces.

 tradesmith45's gear list:tradesmith45's gear list
Fujifilm X-T2 Olympus E-M1 II Fujifilm X-T20 Olympus M.Zuiko Digital ED 60mm F2.8 Macro Samyang 12mm F2.0 NCS CS +5 more
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