Albert Siegel | K-3 Mark III Hands-On

**TwoUptons** · 02-13-2021, 11:07 AM

Originally posted by phoebus

That's not quite true. If the subject is moving in the Z axis, then the perfectly focused lens stops focusing while the mirror, then shutter move (PDAF can't function during this period). The distance travelled between pressing the shutter release and the actual capture of the image may be significant. AF tracking and prediction should continue to focus the lens all the way through the image capture. And hopefully with the K3iii it will.

PS Mirrorless isn't the full answer either, as there is still a discrete time between the last focus command and the shutter closing and re-opening.

And then some of those pesky subjects keep moving during the exposure...
How long before our phones and cameras adjust for that on the fly?

-Eric

gatorguy · 02-13-2021, 11:13 AM

edit

reh321 · 02-13-2021, 11:36 AM

Originally posted by TwoUptons

And then some of those pesky subjects keep moving during the exposure...
How long before our phones and cameras adjust for that on the fly?

-Eric

The phones probably are already - for cameras, it will depend on how fast processing can react.
I’m guessing it will turn out that the K-3iii has a quick processor.

Wheatfield · 02-13-2021, 02:13 PM

Originally posted by TwoUptons

And then some of those pesky subjects keep moving during the exposure...
How long before our phones and cameras adjust for that on the fly?

-Eric

I'm pretty sure I've seen predictive AF as a feature tied to continuous AF.
Just not on Pentax.

**TwoUptons** · 02-13-2021, 02:35 PM - **1 Like**

Originally posted by Wheatfield

I'm pretty sure I've seen predictive AF as a feature tied to continuous AF.
Just not on Pentax.

My PZ-20 had predictive autofocus in the old-school “guess where focus should be when the mirror goes up and the shutter opens” sense.

So it’s been around in Pentax land for a while now...

That doesn’t mean it was terribly effective...

-Eric

Wheatfield · 02-13-2021, 02:40 PM - **1 Like**

Originally posted by TwoUptons

My PZ-20 had predictive autofocus in the old-school “guess where focus should be when the mirror goes up and the shutter opens” sense.

So it’s been around in Pentax land for a while now...

That doesn’t mean it was terribly effective...

-Eric

Yes well, the AF on the PZ-20 was barely effective. I'm not sure how well predictive AF would work on a camera that could barely keep up with a half frozen snail.

**TwoUptons** · 02-13-2021, 05:03 PM

Originally posted by Wheatfield

Yes well, the AF on the PZ-20 was barely effective. I'm not sure how well predictive AF would work on a camera that could barely keep up with a half frozen snail.

As the owner of a ME-F, the PZ-20 wasn’t that bad.
When paired with the FA28-105, it did fine, even if its single point wasn’t very sophisticated.

-Eric

Gray · 02-13-2021, 07:46 PM

Originally posted by Mikesul

Ed is still here.

Ed is gone. He explains why in the video.

gatorguy · 02-14-2021, 06:35 AM - **8 Likes**

This thread is retiring. There are good links above for those interested in ongoing discussion of the upcoming K3III

Th-th-th-that's all folks!

Thread closed.

02-13-2021, 11:13 AM	#572
gatorguy Moderator Join Date: Feb 2015 Location: Central Florida Photos: Gallery Posts: 6,092	edit Last edited by gatorguy; 02-13-2021 at 11:20 AM.

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02-13-2021, 11:07 AM	#571
TwoUptons Loyal Site Supporter Join Date: Nov 2015 Photos: Albums Posts: 4,213	Originally posted by phoebus That's not quite true. If the subject is moving in the Z axis, then the perfectly focused lens stops focusing while the mirror, then shutter move (PDAF can't function during this period). The distance travelled between pressing the shutter release and the actual capture of the image may be significant. AF tracking and prediction should continue to focus the lens all the way through the image capture. And hopefully with the K3iii it will. PS Mirrorless isn't the full answer either, as there is still a discrete time between the last focus command and the shutter closing and re-opening. And then some of those pesky subjects keep moving during the exposure... How long before our phones and cameras adjust for that on the fly? -Eric

02-13-2021, 11:36 AM	#573
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,177	Originally posted by TwoUptons And then some of those pesky subjects keep moving during the exposure... How long before our phones and cameras adjust for that on the fly? -Eric The phones probably are already - for cameras, it will depend on how fast processing can react. I’m guessing it will turn out that the K-3iii has a quick processor.

02-13-2021, 02:13 PM	#574
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,981	Originally posted by TwoUptons And then some of those pesky subjects keep moving during the exposure... How long before our phones and cameras adjust for that on the fly? -Eric I'm pretty sure I've seen predictive AF as a feature tied to continuous AF. Just not on Pentax.

02-13-2021, 02:35 PM - 1 Like	#575
TwoUptons Loyal Site Supporter Join Date: Nov 2015 Photos: Albums Posts: 4,213	Originally posted by Wheatfield I'm pretty sure I've seen predictive AF as a feature tied to continuous AF. Just not on Pentax. My PZ-20 had predictive autofocus in the old-school “guess where focus should be when the mirror goes up and the shutter opens” sense. So it’s been around in Pentax land for a while now... That doesn’t mean it was terribly effective... -Eric

02-13-2021, 02:40 PM - 1 Like	#576
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,981	Originally posted by TwoUptons My PZ-20 had predictive autofocus in the old-school “guess where focus should be when the mirror goes up and the shutter opens” sense. So it’s been around in Pentax land for a while now... That doesn’t mean it was terribly effective... -Eric Yes well, the AF on the PZ-20 was barely effective. I'm not sure how well predictive AF would work on a camera that could barely keep up with a half frozen snail.

02-13-2021, 05:03 PM	#577
TwoUptons Loyal Site Supporter Join Date: Nov 2015 Photos: Albums Posts: 4,213	Originally posted by Wheatfield Yes well, the AF on the PZ-20 was barely effective. I'm not sure how well predictive AF would work on a camera that could barely keep up with a half frozen snail. As the owner of a ME-F, the PZ-20 wasn’t that bad. When paired with the FA28-105, it did fine, even if its single point wasn’t very sophisticated. -Eric

02-13-2021, 07:46 PM	#578
Gray Veteran Member Join Date: Oct 2011 Location: Cape Town Photos: Gallery Posts: 536	Originally posted by Mikesul Ed is still here. Ed is gone. He explains why in the video.

02-14-2021, 06:35 AM - 8 Likes	#579
gatorguy Moderator Join Date: Feb 2015 Location: Central Florida Photos: Gallery Posts: 6,092	This thread is retiring. There are good links above for those interested in ongoing discussion of the upcoming K3III Th-th-th-that's all folks! Thread closed.

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