Go Back   Steve's Digicams Forums > Digicam Help > News Discussion

Thread Tools Search this Thread
Old Jun 14, 2011, 7:46 AM   #1
Senior Member
hanalwala's Avatar
Join Date: Aug 2010
Location: Dubai (U.A.E.)
Posts: 268
Default Flamingo's in flight...

In Dubai we have a place called Ras Al Khor where we have mangroves and where we can see flamingo's year round. I went there this evening to take some pictures of the flamingo's. Now I have two problems to discuss:

a). My camera is Canon 60D and I used my Canon 500mm f4.0L USM (non IS)lens and also fixed TC1.4x on it to get close ups. As soon as I fixed the TC 1.4x the auto focus function stopped. (the click sound and the light stopped). I removed the TC and the auto focus started.

I then took my Canon 70-200mm f2.8L ISM (with IS) and with this lens used the TC1.4x and there was no problem at all and the auto focus also worked.

Could you please tell me why the auto focus did not work when I put the TC on the Canon 500mm ?? Your advice will be very helpful.

b). Removing the TC from the Camera/Lens I took some pictures with the flamingo's flying. The setting were ISO320, f/8 and f/10 shutter speed between 1/500 to 1/1200sec, spot metering. All Servo focus. I was not able to get any sharp focus images. Could you please advice??

I am planing a trip to Tanzania this August to see the migration and before that I get to get my hands set to sue my new toy..... Thanks in advance everyone for your kind help...
Attached Images
Canon Digital EOS 60D D-SLR
Canon Lens 55-250mm
Canon Lens 18-55mm
Canon Lens EF 70-200mm f/2.8L USM IS
Canon Lens EF500mm F4L IS USM
Sigma 105mm f2.8 EX Macro
Tokina 11-16mm f2.8 Wide angle
hanalwala is offline   Reply With Quote
Sponsored Links
Old Jun 14, 2011, 4:18 PM   #2
Senior Member
Bob Nichol's Avatar
Join Date: Apr 2003
Location: Eastern Ontario Canada
Posts: 821

The TC introduces a 1 stop loss so the f/4 lens becomes an f/5.6. It was evening and the light was getting dim so my guess is the AF gave up because you exceeded the AF working range: -0.5 - 18 EV. The 70-200mm f/2.8 still worked because it only became an f/4.

As for the focus problem, what AF point selection mode were you in, Auto 9 point or Manual? If manual it would have been difficult to keep the active AF point on a subject bird.

You have to consider atmospheric effects as well. Smoggy, humid, or dusty environments will limit the usable range you can shoot.

Last edited by Bob Nichol; Jun 14, 2011 at 4:21 PM.
Bob Nichol is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 9:39 PM.