Is the Panny 20mm f/1.7 slow to focus on the GX7?

Started 9 months ago | Questions thread
traveler_101
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Re: Is the Panny 20mm f/1.7 slow to focus on the GX7?
In reply to Anders W, 9 months ago

Anders W wrote:

traveler_101 wrote:

jhinkey wrote:

Also, it seems to me that the size of the AF point box seems to affect it as well - i.e., the smaller the size of the AF box the slower it is and is somewhat less reliable, but it may just be me.

No, not just you: I have had a similar experience, but I must admit that I have not undertaken tests to prove this is true.

I haven't noticed any problems with using the smallest AF box (as I always do on my E-M5). Of course, a very small box can occasionally give rise to problems due to insufficiently strong AF signal (contrast relative to noise) within that box. But that's the same for any lens and has nothing to do specifically with the 20.

Absolutely correct, one should increase focus box size when shooting in low light conditions. That said, when trying night shooting back in December i could not get the P-20 to focus at all, while the P-14 did manage, albeit slowly.

 traveler_101's gear list:traveler_101's gear list
Olympus PEN E-PM2 Olympus PEN E-P5 Panasonic Lumix G 20mm F1.7 ASPH Olympus M.Zuiko Digital ED 40-150mm 1:4-5.6 Panasonic Lumix G 14mm F2.5 ASPH +1 more
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