Pana 20mm F1.7 focus speed vs Oly 45mm F1.8 (video)

Started Mar 9, 2013 | Discussions thread
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micksh6
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Pana 20mm F1.7 focus speed vs Oly 45mm F1.8 (video)
Mar 9, 2013

Since there are many arguments about 20mm F1.7 focusing speed I captured a video to demonstrate.

Video lasts 2 minutes and 19 seconds, Oly 45mm is first, then Panasonic starts after 56 seconds. Focused each lens 10 times plus refocused every time at longer distance. The same light.

The main difference - Panasonic hunted 3 times, Olympus didn't hunt at all.
When Panasonic didn't hunt the focusing times were (measured by counting frames in video):
20mm: 260-330ms (8-10 frames)
45mm: 130-200ms (4-6 frames)

You can decide how these numbers are important for you, but for me 130ms delay is often important. And, when Pana 20mm starts hunting it most likely means missed shot.

Few notes:
Light was dim, camera measured ISO 3200 F2.0 and 1/20s for dark areas. I chose these settings so that difference in speed could be measured easier. Also because it is hard to reproduce focus hunting consistently. Focus hunting may happen in brighter light when you need to focus at less contrasty object. It is something that I'm familiar with after using 20mm lens for 1.5 year, but it doesn't show up in every test.
Panasonic 25mm F1.4 would be at least as fast as Oly 45mm to focus, maybe even faster.

Camera - E-PL5, but I had similar experience on E-M5 and E-P3.

youtu.be/GXRM7Lsa7w8

 micksh6's gear list:micksh6's gear list
Olympus PEN E-PL5 Olympus E-M1 Olympus M.Zuiko Digital ED 9-18mm 1:4.0-5.6 Panasonic Leica Summilux DG 25mm F1.4 Olympus M.Zuiko Digital ED 40-150mm 1:4-5.6 R +6 more
Olympus PEN E-P3 Olympus PEN E-PL5
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