Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-16-2010, 09:19 PM   #1
Veteran Member
Reportage's Avatar

Join Date: Feb 2009
Photos: Gallery
Posts: 739
Trying my hand at birdwatching

I have a 75-300 but more then often, the lens has problem seeking/locking on and sometimes even loses focus. I expected as much in lowlight but in bright daylight?

opinions?

05-16-2010, 09:36 PM   #2
Moderator
Site Supporter
photolady95's Avatar

Join Date: May 2009
Location: Cruising PentaxForums and watching your back.
Photos: Gallery | Albums
Posts: 8,905
Might try manual focus to see if that helps. I never use autofocus when photographing birds. They move too much, either via the limb and wind or just ruffling their feathers.
05-16-2010, 09:41 PM   #3
Pentaxian
wildman's Avatar

Join Date: Jun 2008
Location: Flyover America
Posts: 4,313
QuoteOriginally posted by photolady Quote
Might try manual focus to see if that helps. I never use autofocus when photographing birds. They move too much, either via the limb and wind or just ruffling their feathers.
I second the above...
05-17-2010, 03:19 AM   #4
Senior Member
opfor's Avatar

Join Date: Dec 2008
Location: Oxford, UK
Photos: Albums
Posts: 274
Agree with the manual focus, the less noise your make the better...

05-18-2010, 05:00 AM   #5
hcc
Pentaxian
hcc's Avatar

Join Date: Nov 2009
Location: Brisbane, Australia
Photos: Gallery | Albums
Posts: 3,482
Bird watching and photography may mean Birds in Flight (BIF) and birds not flying (BNF).

For BIF, there was a worthwhile recent thread at Pentaxforms.com:
https://www.pentaxforums.com/forums/pentax-dslr-discussion/101070-k7-auto-foc...ction-bif.html
Several Pentaxians agree that MF is better. The thread is worth to read in details.

For non-flying bird (BNF), AF with center focus works fine. I enclose some thumbnails (with link to original photo) taken with a DA18-250mm, MF, AF-S, Center focus.



I have used also MF lenses and had no major issue.

Hope that the comment will help...
05-18-2010, 06:26 AM   #6
Pentaxian
reeftool's Avatar

Join Date: Dec 2007
Location: Upstate New York
Photos: Gallery | Albums
Posts: 8,009
One of the problems with birds and wildlife is that most often there is brush and tree branches in the frame in front of and behind the target and the cameras auto focus doesn't know a bird from a leaf. This also happens in sports as the cameras AF will try to focus on something in the background as you try to follow and capture the action. Sometimes you just have to manual focus. That isn't always easy, especially with eyesight that is a little off. One of the biggest requirements for for bird and wildlife photography is patience. I have had good results using trap/catch focus with manual lenses. That way you are using the cameras auto focus to trigger the shutter but you are focusing the lens yourself.
05-18-2010, 06:47 AM   #7
Ira
Inactive Account




Join Date: Mar 2009
Location: Coral Springs, FL
Photos: Gallery | Albums
Posts: 5,218
Why don't you try baiting in the backyard with a feeder?
05-18-2010, 07:56 AM   #8
Veteran Member
Reportage's Avatar

Join Date: Feb 2009
Photos: Gallery
Posts: 739
Original Poster
QuoteOriginally posted by reeftool Quote
One of the problems with birds and wildlife is that most often there is brush and tree branches in the frame in front of and behind the target and the cameras auto focus doesn't know a bird from a leaf. This also happens in sports as the cameras AF will try to focus on something in the background as you try to follow and capture the action. Sometimes you just have to manual focus. That isn't always easy, especially with eyesight that is a little off. One of the biggest requirements for for bird and wildlife photography is patience. I have had good results using trap/catch focus with manual lenses. That way you are using the cameras auto focus to trigger the shutter but you are focusing the lens yourself.
catch in focus....my camera has that function but my main worry is that it will activate supposingly if the branch/leaf was in focus rather then the bird.

05-18-2010, 09:53 PM   #9
Loyal Site Supporter
Canada_Rockies's Avatar

Join Date: Nov 2007
Location: Sparwood, BC, Canada
Photos: Gallery | Albums
Posts: 9,142
QuoteOriginally posted by Reportage Quote
catch in focus....my camera has that function but my main worry is that it will activate supposingly if the branch/leaf was in focus rather then the bird.
Yes, that will happen. I tried an AF lens (Sigma 170-500) thinking i could get more keepers with AF. I didn't. It seemed always to focus on the branches, and never on the bird.

Focus confirmation with the M 400/5.6 that I am using does exactly the same thing. I added a Pentax magnifying eye piece to help with manual focus, turn the camera to MF and focus by eye. It's a learnable trick. It helps to be stopped down at least one stop to give a tiny bit more depth of field (and there is not very much depth of field at 400mm!).
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!
camera, pentax help, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hand Strap? NecroticSoldier Pentax Camera and Field Accessories 8 05-29-2010 07:45 PM
People Trying my hand on PP elpolodiablo Photo Critique 12 05-20-2010 10:56 AM
Wanted - Acquired: Pentax Telescope for Birdwatching Miguel Sold Items 1 04-18-2010 07:57 PM
Photos of my new second hand FA*24 springtian Pentax SLR Lens Discussion 15 07-11-2009 04:01 AM
Hand Shadow Sailor Post Your Photos! 8 03-29-2009 06:52 AM



All times are GMT -7. The time now is 08:06 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