K3 III : Action When AF Fails setting to Stop Lens

[KPM2]

Hello

Today we had a bike race that went through our village. So I photographed a bike race for the first time. I used the K3 III and the D FA 150-450 and AF-C. I used a tripod so that my viewfinder could provide a steady image for the AF point. What I noticed during the recording was that the lens sometimes didn't even start to focus, sometimes, it simple stoped to focus. Especially after switching the focus from near to far. When I got home I remembered that I had tried this setting Action When AF Fails setting some days bevore and I had it still at: Stop Lens

What I want to say is this: I'll probably never use this setting again, because it's not like the AF just gives up after a few tries, it sometimes doesn't start at all!

At home, my lens, which was still in a close-up position, no longer wanted to focus on a distant pine tree. When I set this setting back to Drive Lens, everything worked fine again.

Nevertheless ,some pictures with this setting:













some even greeted



best regards KPM2

 

[flektogon]

Even if you experienced problems, the pictures are still excellent. But I don't understand what went wrong. Is it the camera or the lens? Did you try AF-C mode with different lenses? Did you try this (150-450) lens on a different Pentax body in the AF-C mode?

 

[KPM2]

Hello flektogon

Even if you experienced problems, the pictures are still excellent. But I don't understand what went wrong. Is it the camera or the lens? Did you try AF-C mode with different lenses? Did you try this (150-450) lens on a different Pentax body in the AF-C mode?

The K3 III has a few new setting options for the AF, but I don't yet understand their purpose/effect, such as stopping the focus search if the AF fails. You can activate it or not. Unfortunately, I had it activated to find out what it does somedays before and did not set it back, but now I know that sometimes the AF doesn't even start searching, or sometimes it just gives up too quickly.

best regards KPM2

 

[Kobie M-C]

Even if you experienced problems, the pictures are still excellent. But I don't understand what went wrong. Is it the camera or the lens? Did you try AF-C mode with different lenses? Did you try this (150-450) lens on a different Pentax body in the AF-C mode?

Nothing went wrong. The setting to stop lens when AF fails does exactly what it says. If there's no sharp enough focus, the lens won't move.

I've tried using it as a pseudo focus trap but when you go to re-focus, it just won't drive the lens. You have to manually adjust to get close to focus then it will start driving the lens again. Needless to say, I don't use the option anymore.

--
I am not a Pentax insider. I just have a unique way of gaining insight.

 

[KPM2]

Hello Kobie M-C

Even if you experienced problems, the pictures are still excellent. But I don't understand what went wrong. Is it the camera or the lens? Did you try AF-C mode with different lenses? Did you try this (150-450) lens on a different Pentax body in the AF-C mode?

Nothing went wrong. The setting to stop lens when AF fails does exactly what it says. If there's no sharp enough focus, the lens won't move.

I've tried using it as a pseudo focus trap but when you go to re-focus, it just won't drive the lens. You have to manually adjust to get close to focus then it will start driving the lens again. Needless to say, I don't use the option anymore.

Thanks for the post. I didn't even notice this behavior at first...until today. I tried something straight away through your post. I like to work with the catch in focus on the bird house, but that is always a fixed focus point. Now I've tried it with this setting. I can focus on the front and back wood immediately but when I bring the AF point to the green background the AF stops... and I can then press the shutter release button fully and the camera starts to focus again and releases the shutter when something “comes close to the focus point”.







Unfortunately the birds are almost gone, but when they're all back tomorrow I'll try it out again.

When the background got more contrast do to a sunbeam, the AF did suddenly start focusing on the background as well.

the background from the pictures above



best regards KPM2

 

[maranatha]

These are very Good