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10-19-2012, 07:58 PM   #31
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The comment also said "in addition".

10-19-2012, 08:08 PM   #32
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So ... what's the final word (for AF "precision")?

For instance, will it be acurately useable with the DA*300/4 ? Will it make it more "acurate"? Will it make it worse?
Will it still work at F4 and "up" (f4.5, 5.6, etc...)

Really, what does this all mean in terms of usability with ANY lens?

JP
10-19-2012, 08:18 PM   #33
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QuoteOriginally posted by jpzk Quote
So ... what's the final word (for AF "precision")?

For instance, will it be acurately useable with the DA*300/4 ? Will it make it more "acurate"? Will it make it worse?
Will it still work at F4 and "up" (f4.5, 5.6, etc...)

Really, what does this all mean in terms of usability with ANY lens?

JP
I have yet to hear back from Pentax, but lenses slower than f/2.8 should continue to focus without loss of functionality.

--DragonLord
10-19-2012, 08:23 PM   #34
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QuoteOriginally posted by jpzk Quote
So ... what's the final word (for AF "precision")?

For instance, will it be acurately useable with the DA*300/4 ? Will it make it more "acurate"? Will it make it worse?
Will it still work at F4 and "up" (f4.5, 5.6, etc...)

Really, what does this all mean in terms of usability with ANY lens?

JP
It depends on how it is implemented.

The f2.8 sensor would do nothing if very little for slower lenses so as long as non of the f/5.6 sensors are replaced it will do nothing negative for the focusing at least. Adding a f/8 sensor might be a nice idea to improve the speed but i doubt we would ever see that.
Most of the AF advancement is going in to sensor base focusing these days.

10-19-2012, 08:36 PM   #35
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Thanks for the update - I hope you are correct, and I suspect Pentax wouldn't re-engineer their AF to cripple it in certain ways. As you said, it would be more intelligent to just add the F2.8 sensors in the format you proposed.
10-19-2012, 08:52 PM   #36
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Sorry for the double posts, i'm unable to edit my posts and the moderator approved them all
10-20-2012, 10:49 AM   #37
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QuoteOriginally posted by DragonLord Quote
I have yet to hear back from Pentax, but lenses slower than f/2.8 should continue to focus without loss of functionality.

--DragonLord
QuoteOriginally posted by Anvh Quote
It depends on how it is implemented.

The f2.8 sensor would do nothing if very little for slower lenses so as long as non of the f/5.6 sensors are replaced it will do nothing negative for the focusing at least. Adding a f/8 sensor might be a nice idea to improve the speed but i doubt we would ever see that.
Most of the AF advancement is going in to sensor base focusing these days.
QuoteOriginally posted by Anvh Quote
Sorry for the double posts, i'm unable to edit my posts and the moderator approved them all
Thanks for the info.

While I am waiting for my K5 to come back from Mississauga (Pentax Canada HQ) because of yet another repair, I browse this thread and became interested to know a bit more about this AF business with the K5II/IIs.
Not that I want to "upgrade" just yet, but I find this thread reather interesting to say the least.

Anything that would actually make the K5 AF more "acurate" and/or "precise" would be a huge bonus for me.

We shall then see how this comes down during the next few weeks once actual users got their hands on that camera.

Cheers.

JP
10-21-2012, 12:00 AM   #38
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Mhmm me too but it's quite a bit of money though for just an AF upgrade...
Hoping that Pentax has a camera in his bag above the K5.

With f/5.6 lenses you don't need to be as accurate as f/2.8 or faster so the extra accuracy is really appreciated there.

10-23-2012, 01:44 PM   #39
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Just got this response from PENTAX in my personal email:

QuoteQuote:
Thank you for contacting PENTAX.

We have not received this specification for the center AF sensor type in the K-5ll and K-5lls from PENTAX Japan but our corporate office will make a request for this information. If PENTAX Japan provides us with this specification we will be happy to pass it along to you.
--DragonLord
10-23-2012, 08:38 PM   #40
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https://www.pentaxforums.com/forums/pentax-k-5/203009-more-k-5ii-auto-focus-system-details.html
10-24-2012, 01:16 AM   #41
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QuoteOriginally posted by Anvh Quote
Mhmm me too but it's quite a bit of money though for just an AF upgrade...
Well, there is the improved back LCD as well, and the (poor man's) AF tracking that shares AF sensors (as in the K-30).

Allegedly, there are more advantages, such as better JPG processing, but I'm not sure about these.

QuoteOriginally posted by Anvh Quote
Hoping that Pentax has a camera in his bag above the K5.
Expect a 24MP APS-C K-3 in early 2013.

Last edited by Class A; 10-24-2012 at 01:24 AM.
10-25-2012, 10:37 AM   #42
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I shoot RAW, mostly manual focusing and almost never use the LCD screen, only for my settings or to quickly look at the histogram.
So... not for me.


Lets hope so, sound good.
10-26-2012, 01:24 PM   #43
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First tests of Beholder3 seem to indicate that the anticipated problems should at least be not as severe as expected: Test shots
10-26-2012, 04:05 PM   #44
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Here is something that Pentax could - and should produce a whitepaper on and post on their website. They did a public presentation on it - put it out for the rest of us.

10-26-2012, 04:53 PM   #45
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Okay, it is now clear that the f/2.8 high-precision point is in addition to, not in lieu of, the existing AF sensors.

As such, Rice High's claim that the center point is disabled below f/2.8 is false. I feel Rice High often jumps to (mostly negative and incorrect) conclusions, rather than taking a closer look at the information--but we should also remember that he's not always wrong. As with anything, we should be critical of what we see on the Internet.

--DragonLord

Last edited by bwDraco; 10-26-2012 at 05:46 PM.
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