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Forum: Pentax DSLR Discussion 05-21-2017, 07:07 PM  
Pentax, autofocus and the future
Posted By BrianR
Replies: 287
Views: 22,108
My apologies if you took this in an offensive way, it was not my intent. I don't generally mean 'odd' to mean a bad thing, eg. I typically equate 'odd people' with 'interesting people'. Call it "different" or "unique" if you prefer.

What you've described is not how anyone I know shoots when prefocusing, and I have filed it away as something to keep in mind if I ever come up for a use case for it.



That thread speaks for itself.

I'm done in this one, have a good night.
Forum: Pentax DSLR Discussion 05-21-2017, 06:17 PM  
Pentax, autofocus and the future
Posted By BrianR
Replies: 287
Views: 22,108
No, I never said ANYTHING of the sort (quick edit- on a second read, I don't know what you're trying to say, some typos in there that I might have misread), in fact I said the complete opposite from the first time you brought this test up:

Slow Pentax AF.... ha, eat my shorts - PentaxForums.com



I also never said this AT ALL. I've said what you do is odd, and not the normal method of prefocusing as I've ever read it explained, which would involve focusing on the thing, then holding the half-press (i.e. the "Prefocused" line of your IR tests), or switching to manual focus. Under these conditions, the K-1 is not faster than the 1Dx. And an edit - to be clear, under the corner case that you live in, yes, the K-1 responds faster than the 1Dx, I've NEVER disputed that line of the IR tests.



Dunno, they aren't ready? You're better at predicting the action? You're firing your burst before the action peaks? They aren't using their cameras in an optimal way? All sorts of variables that are utterly out of control if you hope this to be a comparison of two camera systems.

---------- Post added 05-21-17 at 09:22 PM ----------



They have a "Manual Focus" line:

"For most cameras, shutter lag is less in manual focus than autofocus, but usually not as fast as when the camera is "prefocused"."

and a "Prefocused" line:

"Time to capture, after half-pressing and holding shutter button."

So yes, it is included.



And again, I was one of the people who pointed this out to you:

Slow Pentax AF.... ha, eat my shorts - PentaxForums.com
Forum: Pentax DSLR Discussion 05-21-2017, 05:52 PM  
Pentax, autofocus and the future
Posted By BrianR
Replies: 287
Views: 22,108
What I've said about the 1dx is straight from the Imaging Resources test you keep going on about:

Canon 1DX Review: Initial Test - Performance

See the "prefocused" line. See also the Live View section.

For reference, the K-1 page is here:

Pentax K-1 Review - Performance

It's not that complicated.


What I've said about the lag time with BBF was a guess, I was clear about that. The lag is pretty much non-detectable to me shooting with BBF and my k5iis. So even if it fell under the worst case of the IR tests for the k5iis, I'm confident that it's by far not the slowest piece of the puzzle (that would be me and my finger).
Forum: Pentax DSLR Discussion 05-21-2017, 03:41 PM  
Pentax, autofocus and the future
Posted By BrianR
Replies: 287
Views: 22,108
None of them directly apply to Back Button Focus in any AF mode that I can see, so I don't see how you can compare. I'd take a guess that the shutter lag you'd get would close to the lag for MF. Just a guess, but it doesn't seem to me that it activates the AF routine if you are setup for BBF but keep your finger off the AF button when you hit the shutter (this is how I usually prefocus, and probably pretty standard for BBF users).

In any case, it's worth pointing out that the canon 1dx user who couples the focusing with the shutter button can hold the half press after prefocusing and eliminate the shutter release lag penalty compared to the k1. Also kinda interesting is that pre-focused in liveview (holding shutter half-pressed), the 1dx wallops the k1. The pre-focused liveview 1dx is even faster (by an amount that's probably irrelevant to most uses) than the pre-focused optical viewfinder k1. Kinda impressive, and I think this would make LiveView less annoying (only applies to pre-focused, the lag for either AF mode would still be annoying).
Forum: Pentax DSLR Discussion 04-07-2017, 04:42 AM  
Pentax, autofocus and the future
Posted By BrianR
Replies: 287
Views: 22,108
To repeat - the Imaging Resource numbers are not a test of how fast the camera can adjust the focus ring and lock on to a target, they are beginning with the target already in focus.

Read the text below the "Shutter Response (Lag Time)" charts for the K-1:

Pentax K-1 Review - Performance

"To minimize the effect of different lens' focusing speed, we test AF-active shutter lag with the lens already set to the correct focal distance."

And a wordier version on the d7100 review:

Nikon D7100 Review - Performance

This is not at all the same as your field test of making the camera focus on targets of different distances, so yes, it is a completely different story but not because of field vs controlled conditions.
Forum: Pentax DSLR Discussion 03-22-2017, 08:33 PM  
Pentax, autofocus and the future
Posted By BrianR
Replies: 287
Views: 22,108
No distraction on my end! Thanks for taking the time:)

I'm also surprised that the Pentax would give up and not be able to find a lock at times. I've actually been pretty amazed at how my k5iis can reliably lock onto something in low light levels (mostly non-moving targets). I've no experience with the k-3 (which should be improved), nor the 16-50mm.
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