I feel misled: Panasonic 20mm f1.7 II AF is SO SLOW!

Started Apr 28, 2014 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: I feel misled: Panasonic 20mm f1.7 II AF is SO SLOW!

Mark Chan wrote:

G1Houston wrote:

Mark Chan wrote:

Another three examples that I am sure the 20mm f1.7 wont' work well in.

Through a fence. The 20mm would hunt through this.

Pretty much instantaneous; and taken with my left hand no less.

Youngsters walking by; followed their motion to add a 'bit' of character to the pic. The 20mm would still not have focused by the time they had gone past.


Not sure about the points of these pictures, none of them is in focus except the last one.

Actually; the first one is overexposed given the varied lighting; shot of food stall through fence - This wasn't set the best obviously and I later took a shot of the food stall once I queued past the fence. Point being this the sort of shot the 20mm would have had difficulty focusing.

Second one has focus at the lady's face in the middle left of the pic. hustle bustle in the market.

Third shot is the least focused as I very quickly caught focus and moved the camera along their direction to get some more blur to the background. With the 20mm you'd have had to prefocus and wait for a couple to go by to get this shot.

The 20mm would struggle mightily with the lighting conditions. And as the other poster said, I'd rather have a lens that is capable of getting the pics when I need it without the need to prefocus in advance before I got the shot.

These three pics where with me holding an umbrella, a few bags of food, and shooting with the camera in my LEFT hand. At night in the rain.

There is no evidence whatsoever that the 20/1.7 has greater difficulty locking focus than other lenses in apples-to-apples comparisons (same light conditions, same AF target, same target magnification). The ability to lock focus is a matter of the strength of the AF signal the body is given to work with. Apart from target attributes (including illumination and magnification), that signal is purely a matter of light intake (max aperture) and (to a lesser extent) contrast/microcontrast. The 20 is doing very well in both these regards in comparison with most other lenses, including the one you used here. So what you say above is pure speculation without any factual basis.

As I have already pointed out many times, the 20 will be significantly slower than other lenses when it does hunt. But it is no more prone to hunting than other lenses under comparable conditions.

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