Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-05-2012, 12:59 PM   #1
Forum Member




Join Date: Sep 2012
Location: Frederick, CO
Photos: Gallery
Posts: 58
back button autofocus - how?

I always change my camera settings so that the shutter button does not enable autofocus. I've done this with every camera I own so far, but I can't figure out how to do it with my new K-30. Could some generous soul pass along the secret? Please?

I should note that I have set the back AF / AE-L button to enable autofocus, and it works fine, but the shutter button keeps doing it as well.

09-05-2012, 01:28 PM - 1 Like   #2
Site Supporter




Join Date: Mar 2012
Posts: 24
Capture menu 4 / Button Customization / AF/AEL / Enable AF2 AF with shutter release button is disabled so AF is performed with the AF?EE-L button.

Regards Frank
09-05-2012, 01:35 PM   #3
Forum Member




Join Date: Sep 2012
Location: Frederick, CO
Photos: Gallery
Posts: 58
Original Poster
THANK YOU! So obvious now, duh.
09-05-2012, 01:47 PM   #4
Veteran Member
Docrwm's Avatar

Join Date: Sep 2010
Location: Somewhere in the Southern US
Photos: Gallery | Albums
Posts: 11,275
What is the advantage of not having the half press of the shutter button perform AF?

09-05-2012, 01:58 PM   #5
Forum Member




Join Date: Sep 2012
Location: Frederick, CO
Photos: Gallery
Posts: 58
Original Poster
By divorcing the exposure meter and the autofocus motor, you can do one or the other without always having to do both at the same time. "focus then recompose" portrait shooters do this, and landscape shooters do this, among others (macro?).

I honestly would have returned the camera if it couldn't do this.
09-05-2012, 02:00 PM   #6
Senior Member




Join Date: Jul 2007
Location: Phnom Penh, Cambodia
Photos: Gallery
Posts: 149
Plus, it makes it so no one else wants to use your camera!
09-05-2012, 03:04 PM   #7
jup
Forum Member




Join Date: Nov 2009
Location: San Jose, CA
Posts: 89
QuoteOriginally posted by kevwil Quote
By divorcing the exposure meter and the autofocus motor, you can do one or the other without always having to do both at the same time. "focus then recompose" portrait shooters do this, and landscape shooters do this, among others (macro?).
Exposure metering isn't connected to half shutter press by default. So you can do this easily with default settings - focus with half shutter press -> recompose (this will meter for recomposed image) -> press shutter. But with decoupled AF, you can then immediately press shutter again, maybe change settings, and don't have move the camera and refocus on the same subject. Otherwise, camera's kind of forcing you to refocus for every picture, which may not be what you want.

My only issue with this & K-30 is loosing AE-L, which I find usually even more handy - especially with center-weighted/spot metering it's pretty invaluable. I might start poll how many people use that button for AF and how many for AE-L, would be kind of interesting.
09-05-2012, 03:42 PM   #8
Forum Member




Join Date: Sep 2012
Location: Frederick, CO
Photos: Gallery
Posts: 58
Original Poster
QuoteOriginally posted by NewportPreacher Quote
Plus, it makes it so no one else wants to use your camera!
Yes! Just like my computers! (Dvorak keyboard)

09-05-2012, 07:38 PM   #9
Site Supporter
patrick9's Avatar

Join Date: Feb 2011
Location: Murfreesboro Tennessee
Photos: Gallery | Albums
Posts: 3,279
QuoteOriginally posted by Docrwm Quote
What is the advantage of not having the half press of the shutter button perform AF?
On my DL I was having trouble with missing shots as the AF would search, and search and search each time the shutter was activated,even tho distance had not changed from the prior shot ,or the shutter would not fire, focus issues I was missing way two many shots . I don't have that problem any more since moving AF to the OK button . I just wish I had done it sooner.
09-06-2012, 02:41 AM   #10
Veteran Member
borno's Avatar

Join Date: Nov 2006
Location: md-usa
Photos: Gallery | Albums
Posts: 2,580
QuoteOriginally posted by Docrwm Quote
What is the advantage of not having the half press of the shutter button perform AF?
BBAF is great for wildlife and sports in afc as you can follow action while taking shots and if you are tracking and an obstruction (tree or referee) is about to get in the way, just let up on the af button until it passes. It keeps the camera from searching so much to refocus. Manual focus for difficult situations is also instantly available (with the better lenses). Heartily recommended.
09-13-2012, 07:35 AM   #11
New Member




Join Date: Sep 2012
Posts: 14
So is there no way to lock AE when AE-L is used for AF?
Is there a setting (which I can't find) to lock AE with half press.

The alternative would be to flip the AF mode to manual each time but that is a PITA
09-13-2012, 08:25 AM   #12
Veteran Member




Join Date: Jul 2010
Photos: Gallery | Albums
Posts: 573
Canon shooters rave about this. Here is a good thread about it

So I finally moved to back button focusing - Canon Digital Photography Forums

and a good article on it linked from the thread above
Canon DLC: Article: Back-Button Auto Focus Explained
09-13-2012, 11:48 AM   #13
jup
Forum Member




Join Date: Nov 2009
Location: San Jose, CA
Posts: 89
QuoteOriginally posted by evandavies1 Quote
So is there no way to lock AE when AE-L is used for AF?
Is there a setting (which I can't find) to lock AE with half press.
Sadly, you can't have both - you need K-5 for that which has two separate buttons. There's a setting to lock AE with AF, but it doesn't do anything for half-press if you remove AF from shutter.

You can obviously get lock exposure equivalent by shooting in Manual, but it's not as handy. And AE-L is actually very useful in Manual too - it locks aperture and shutter.

The only other thing you can do is define user mode (or two) with AE-L button and your favorite settings and use AF normally or vice versa (since user mode remembers button mappings). This will give you quick access to one or the other just by turning mode dial. But still, you can't have both at the same time.

PS: I find it kind of sad you can't map one of these to RAW/Fx button. Maybe... Firmware update? Pentax?

QuoteQuote:
The alternative would be to flip the AF mode to manual each time but that is a PITA
That's what I went back to. BBAF is nice, but AE-L is more important. At least for now...
09-13-2012, 01:57 PM   #14
New Member




Join Date: Sep 2012
Posts: 14
Thanks for the rely Jup, but thats definitely a negative point for the K30.
Agree about the RAW/fx button, I haven't found any of the limited options useful.

It would be great to get a firmware update to allow more options but I'm not going to hold my breath.
09-14-2012, 01:21 PM   #15
Forum Member
Hoggy's Avatar

Join Date: Sep 2012
Posts: 51
I've been wondering about this sort of thing for a while now. Before I couldn't figure out how to do it with my bridge camera, a Fuji Finepix S7000.

So when I got my K30, I was hoping it would finally be possible to have 2 separate functions. After reading this I became disappointed.

However, playing around with the button customization, it seems I was able to get them to work separately --- unless I'm missing something (which I probably am ;-). I set the 'AF/AE-L' button customization to 'AE lock'...
Now when I press the shutter halfway, it will lock the focus, but not the AE - I press the AE-L and it will lock the AE.. If I then let go of the shutter (while keeping AE-L pressed), I can press the shutter halfway again for another AF lock - while the AE settings still remain locked from when I first pressed AE-L.

Could this newbie have cracked the problem???
(Somehow I doubt it... I must be missing something, but don't know what yet. :-/)
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
autofocus, button, camera, k-30, k-50, pentax k30, pentax k50, shutter
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Back button Focus MSM Pentax DSLR Discussion 16 10-24-2014 02:18 PM
K10D - ability for back button focusing? Neisey Pentax DSLR Discussion 8 08-19-2009 07:06 AM
save text when hitting the back button! Gooshin Site Suggestions and Help 3 10-20-2008 11:23 AM
Are you a back button focusser with a grip? MJB DIGITAL Pentax DSLR Discussion 7 06-14-2008 05:20 PM
Back Button Focus -- any insights mommytotwo Photographic Technique 8 07-17-2007 12:34 PM



All times are GMT -7. The time now is 04:51 PM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top