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

Started Apr 28, 2014 | Discussions thread
Mark Chan Senior Member • Posts: 1,717
Re: I feel misled: Panasonic 20mm f1.7 II AF is SO SLOW!

Anders W wrote:

Wesley Byrne wrote:

Wesley Byrne wrote:

UPS just delivered my Panasonic 20mm f1.7 II. I had read the reviews and knew the Panasonic 20mm f1.7 autofocus wasn't fast, but I wasn't expecting it to be so unbearably slow. Some here have said that the 20mm f1.7 isn't that slow, and that it autofocuses about as fast as other m43 lenses when large focus adjustments are not needed, but they are wrong. This lens is useless for even slow moving subjects. I am definitely returning this lens.

I know the 20mm f1.7 has many fans, presumably folks who photograph static scenes. In my opinion, compared to the 17mm f1.8 and the 25mm f1.8, the 20mm f1.7 is a dog. Panasonic should be embarrassed for releasing this lens with barely-functional AF.

</end rant>

Slow AF on the 20/1.7? Absolutely. Except if you use it in ordinary AF-S in the range from 0.75 m to infinity and manage not to send it hunting. Fortunately, that exception accounts for more than 99 percent of my usage.

This is the kind of bad advice I was referring to.

It is neither advice nor bad. It is a correct observation based on controlled testing. See here:


What controlled testing did you perform?

Even in these conditions I found the 20mm f1.7 unbearably slow.

Wow Anders, at it again?

When someone 'asks' if 17mm AF is faster than 20mm, what should be the simple and clearest answer?

Yes or NO. Call a spade a spade.

Not 'comparable'; not 'for ordinary use its much the same'; not for 'all practical purposes'.

Just a simple, it is. We can add 'but then I have been able to adapt my photography such that its not an issue.'

This way, you are not misinforming people into thinking that the 20mm lens can do what it cant. A newbie into photography would think that he had a bargain for the 20mm and only later realized the lens was not 'quick enough' for his needs; because somehow, for his 'practical purposes', he would find it slow.

BTW this is from this thread.


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