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: 45 isn't THAT quick -- but the f2.5 14 IS!!!

Hen3ry wrote:

NZ Scott wrote:

RickPick wrote:

You shouldn't expect A/F miracles from a 5 year old design pancake lens.

My f2.5 14mm Panny focuses at warp speed in all kinds of light. Focuses much fasrter rthan the f1. 45mm in many situations -- even ALL situations.

That's certainly true if you shoot the two lenses at the same subject distance (and hence different magnification), for the simple reason that the tele has to move the lens elements more than the WA (starting at the same incorrect focus distance with both lenses).

If, instead, you shoot them at the same magnification (and different subject distance), the AF speed will be roughly the same since in this case the lens elements have to move about the same amount (again starting at the same incorrect focus distance with both lenses). The latter is also true if you start the AF process with both lenses already at the correct focus distance.

 Anders W's gear list:Anders W's gear list
Panasonic Lumix DMC-G1 Olympus OM-D E-M5 Olympus E-M1 Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Vario 7-14mm F4 ASPH +28 more
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