Canon 70D, 70-200mm f/2.8 Zoom Lens With 1.4 Teleconverter
by Bob T.
Canon 1.4X Teleconverter
"I am taking a trip to Alaska and will be taking pictures of wildlife (think brown bear). I have a canon 70D and will be using a canon 2.8 70-200 lens with a 1.4 teleconverter. I am an amateur photographer and am not sure as to the best way to compensate for the one stop drop in aperture while using auto focus. Can you help?"
Thanks for asking about shooting with a Canon 1.4/x Teleconverter and a Canon 70-200nn f/2.8 lens. You're going to have a blast and I hope you get some great wildlife photos. I've only been to Alaska once, but was fortunate to be able to get a few brown bear photos, as well as moose, eagles, mountain goats etc. with my 400mm f/5.6
You definitely should read the results of the test I did using the Canon 1.4x teleconverter and my copy of the 70-200mm f/2.8: Teleconverter Test. You might want to do do your own test, comparing with and without sharpness of using your copy of the teleconverter with your 70-200mm lens before you take your trip. Results can vary with individual lenses, so the only real way to know is to experiment with your specific lenses.
Teleconverter And 70-200mm Compatibility
The good news is that the EF
1.4x extender is fully compatible with your 70D and the EF
70-200mm lens. That means your auto-exposure and autofocusing will work fine. Since the 70-200 lens is a "fast" lens with a nice wide open aperture, the challenges you have with the 1 stop loss of light won't be that tough.
It all depends on the specific situation you're in when photographing the bears and other wildlife what exposure settings you'll use.
Good luck, Bob, and I hope you'll be able to share some of the photos you get with the Canon Camera Geek readers!
BruceCompatibility With 70-300mm lens test