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Pete
Pete, Electronic Engineer
Category: Camera and Video
Satisfied Customers: 15775
Experience:  Over 16 years of experience installing and repairing electronics.
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I have a Canon EOS 7D DSLR Camera - about 5 years old - it

Customer Question

I have a Canon EOS 7D DSLR Camera - about 5 years old - it has an existing Canon Zoom Lens EF-S 18-200mm 1:3.5-5.6 IS.
I am go to Africa in July & want a suitable new, more powerful Zoom Lens
A couple of questions -
I looking at a new Canon EF 100-400mm f/4.5-5.6L II USM lens, which from what I am reading is a very suitable & good lens.
What is the difference between the above Lens & an
EF 100-400mm f/4.5-5.6L IS USM lens
I believe both would be totally suitable to my camera?
Also, I want to buy a Canon 2 X Extender - is this compatible with the 2 New Lenses that I am looking at to buy & also, is it compatible with my existing 18-200mm Zoom Lens?
I also have a problem with my Camera.
I have a battery pack on it for 2 Batteries.
When I recharge the Batteries - the Camera does not recognise the batteries & the top right hand battery charge indicator display does not work & the batteries go flat if I do not use the camera for several days to a week. The Camera is fitted with Genuine Canon Batteries.
I look forward to your advice.
Submitted: 6 months ago.
Category: Camera and Video
Expert:  Pete replied 6 months ago.

Hi Richard

Expert:  Pete replied 6 months ago.

The Canon EF 100-400mm f/4.5-5.6L IS II USM lens is the "Mark 2" version, and have 16 years worth of improvements on the older EF 100-400mm f/4.5-5.6L IS USM lens.

Both lenses would indeed suit your camera.

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You can use these lenses with the 2X extender, however you may find that performance is limited due to diffraction. It should still be good but don't expect wonders.

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The battery problem is common on these Canon cameras.

To resolve the battery problem, try this:

Remove the lens and put a cap on the body.

Turn off the camera but leave a battery in it.

Put the camera in a freezer for 6 minutes.

Then remove the camera and put a room temperature battery in the camera.

Turn on the camera.

The camera should see the battery and display the battery life.

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