Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-03-2010, 03:05 PM   #1
Veteran Member




Join Date: Mar 2010
Location: Missouri
Posts: 400
AF C. just pisses me off.

Went out ATTEMPTING to do some birding today...even though all my lenses are short...using AF C. just irritates me...NONE of the pictures I took are in focus...even though my subjects were all sitting somewhat still (on powerlines and such) and I have the center as the focus point...and that is directly where I put the subject...right in the middle of the viewfinder.

Why is this crap not fixed?

05-03-2010, 03:15 PM   #2
Veteran Member
Ben_Edict's Avatar

Join Date: Jul 2007
Location: SouthWest "Regio"
Photos: Albums
Posts: 3,303
QuoteOriginally posted by timstone Quote
Went out ATTEMPTING to do some birding today...even though all my lenses are short...using AF C. just irritates me...NONE of the pictures I took are in focus...even though my subjects were all sitting somewhat still (on powerlines and such) and I have the center as the focus point...and that is directly where I put the subject...right in the middle of the viewfinder.

Why is this crap not fixed?
If the birds rest and if you have the fixed AF point, why do you use AF-C at all? In that case AF-S would be a much better choice. Also, if you have short fl lenses, as you wrote, it is very demanding on any AF system to actually lock onto a bird, especially when there are other things in the image field (like those powerlines). A subject needs a certain minimum size to be recognizable for the AF - or to be more precise to show a contrast edge, that is big enough to fill the AF sensor area.

I find, that even with my "old" K20, AF-C works surprisingly good on flying birds, IF I have AF point selection on auto (for general shooting I always have the AF fixed on the center point) and IF I have a lens on the camera, which has enough focal length to give a healthy size to the bird.

Ben
05-03-2010, 03:18 PM   #3
Veteran Member
rparmar's Avatar

Join Date: Jan 2008
Photos: Gallery
Posts: 8,783
QuoteOriginally posted by timstone Quote
even though my subjects were all sitting somewhat still (on powerlines and such)
When I first read this I wondered how much you were paying your models.

Then I went back and saw it was birds of the feathery kind.

What camera? K-x?
05-03-2010, 03:28 PM   #4
hcc
Pentaxian
hcc's Avatar

Join Date: Nov 2009
Location: Brisbane, Australia
Photos: Gallery | Albums
Posts: 3,482
Rather than AF-C, I would recomend to consider AF-S with a short burst of Hi continuous shots. It works quite well for me when birds are going to take off.


05-03-2010, 03:43 PM   #5
Ira
Inactive Account




Join Date: Mar 2009
Location: Coral Springs, FL
Photos: Gallery | Albums
Posts: 5,218
QuoteOriginally posted by hcc Quote
Rather than AF-C, I would recomend to consider AF-S with a short burst of Hi continuous shots. It works quite well for me when birds are going to take off.
I echoed my agreement with this in another thread. I hadn't done any fast action sports stuff like this before with my K-x, and I was amazed how many shots I was able fire off in AF-S and get great focus.
05-03-2010, 03:49 PM   #6
Ira
Inactive Account




Join Date: Mar 2009
Location: Coral Springs, FL
Photos: Gallery | Albums
Posts: 5,218
Another thing:

Trying to track a bird in flight requires a hell of a lot of skill. And it could simply be camera movement and incorrect panning.

It could also be your shutter speed--what was it?

And I don't know what camera you were using, but SR should definitely be OFF for this.
05-03-2010, 03:56 PM   #7
Veteran Member




Join Date: Mar 2010
Location: Missouri
Posts: 400
Original Poster
QuoteOriginally posted by Ira Quote
Another thing:

Trying to track a bird in flight requires a hell of a lot of skill. And it could simply be camera movement and incorrect panning.

It could also be your shutter speed--what was it?

And I don't know what camera you were using, but SR should definitely be OFF for this.
I was using a K-x...SR was on (why should it be off?) And my shutter speed was pretty high....ranging from 1/1000 all the way up to 1/2000

QuoteOriginally posted by hcc Quote
Rather than AF-C, I would recomend to consider AF-S with a short burst of Hi continuous shots. It works quite well for me when birds are going to take off.
I will try this the next time...but I think I may have a longer lens by then. *crosses fingers*
05-03-2010, 04:07 PM   #8
Site Supporter
Fries's Avatar

Join Date: Oct 2009
Location: Gauw
Photos: Gallery | Albums
Posts: 1,828
In the situation you where in one leaves SR on. But when you are panning - following a bird in flight - it is better to turn the SR of. I am not a technical guy, but I believe the SR-system is not made to cope with panning. It might even lead to extra blurring of the picture.

05-03-2010, 04:11 PM   #9
Veteran Member




Join Date: Mar 2010
Location: Missouri
Posts: 400
Original Poster
QuoteOriginally posted by Fries Quote
In the situation you where in one leaves SR on. But when you are panning - following a bird in flight - it is better to turn the SR of. I am not a technical guy, but I believe the SR-system is not made to cope with panning. It might even lead to extra blurring of the picture.

Gotcha...wasn't panning...well...I was when I was taking a picture of a bee...but that picture was more sharp than the ones of the birds that were sitting still.
05-03-2010, 04:30 PM   #10
Site Supporter
Fries's Avatar

Join Date: Oct 2009
Location: Gauw
Photos: Gallery | Albums
Posts: 1,828
QuoteOriginally posted by timstone Quote
Gotcha...wasn't panning...well...I was when I was taking a picture of a bee...but that picture was more sharp than the ones of the birds that were sitting still.
Well the situation with the birds and how difficult it is for any DSLR to focus in such a situation with a short lens is explained quite good already. And I've gotten decent results to panning birds when I forgot to turn to SR of. But panning is still a bit of hit and miss game for me at this moment and I probably didn't make this mistake often enough to see any interference from the SR. But it is a advice I've seen over and over again on this forum from members far more advanced in the art of photographing BIF's (birds in flight).
05-03-2010, 04:41 PM   #11
Ira
Inactive Account




Join Date: Mar 2009
Location: Coral Springs, FL
Photos: Gallery | Albums
Posts: 5,218
QuoteOriginally posted by timstone Quote
I was using a K-x...SR was on (why should it be off?)
I don't know how SR exactly works with AF-C on the K-x (my camera too), but here's a very relevant point:

Even if you're shooting a non-moving subject like a flower, SR is not active until you see the hand icon in your viewfinder. You have to half-press, and until you see that hand, it means SR isn't active, and that can make things WORSE. So I don't see how this is possible with AF-C, unless you WAIT to see that icon before hitting the shutter each time.

In addition, SR is NOT meant to handle panning motion in the first place. That's an impossible feat.

So perhaps SR isn't automatically disabled in AF-C because more times than not, the camera movement is not significant. But in your case, trying to pan and shoot birds in flight, this might very well be what is really screwing up these kinds of shots you're doing.
05-03-2010, 05:24 PM   #12
Pentaxian
Arpe's Avatar

Join Date: Sep 2006
Location: New Zealand
Photos: Gallery | Albums
Posts: 4,329
AF-C works. Check my website below to see proof. You just gotta keep your point on the subject, presuming you've selected one point.
Not sure about SR, I've always just left it on, must try it off sometime. Though I think my shutter speeds are high enough to not matter.
05-03-2010, 05:40 PM   #13
Veteran Member
yeatzee's Avatar

Join Date: Feb 2009
Location: Temecula
Photos: Gallery | Albums
Posts: 3,675
AF-C works incredibly well on my K-7.... not so much my K200d however. I have full confidence in my new camera in that mode
05-04-2010, 02:39 PM   #14
Pentaxian
Marc Sabatella's Avatar

Join Date: Sep 2006
Location: Denver, CO
Photos: Gallery
Posts: 10,686
You might want to post a sample you are not happy with. I'm guesisng the problem is actually something as simple as the camera happening to choose to focus on the wire in front of the bird rather than bird. Even when selecting a focus point, the focus sensor is farily large; unless shooting a large bird from close range, it's pretty much guaranteed the wire would have been within range and presented a legitimate target to the camera. It doesn't know a bird from a wire and has no idea which might be more important to you.
05-04-2010, 03:03 PM   #15
Junior Member




Join Date: Mar 2010
Location: Van Isle
Posts: 31
Timely post. Normally I am not a nature photographer, but I took my K7 out on a hike this past weekend. I was rewarded with a bald eagle sitting on a tree. I took a number of pictures, slowly getting closer and closer. AF-S. Focus was good.

As soon as he started to fly off though, I followed and tried to fire as much as possible, but the K7 would not fire (I guess becuase it did not have focus). I pressed the shutter maybe 1- times, but got to out of focus shots. AF-S again.

So from what I read here, I should use AF-S for the standing still, and then AF-C for when he takes off or is in flight?
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!
af, camera, dslr, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -7. The time now is 11:20 AM. | 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