Weekly quiz #11

Categories: Tips and Advice - Tags:

Question #11

The new Canon Extender EF 2x Mk III is optically superior to it's predecessor, how many stops of light will you lose when using it with an EF 70-200mm f/2.8L IS II USM lens?

  • 2 stops (71%, 12 Votes)
  • 1 stop (29%, 5 Votes)
  • 0 stops (0%, 0 Votes)
  • 3 stops (0%, 0 Votes)

Total voters: 17

- See all the previous weekly quiz questions -

The answer to last weeks question

When manually activating the self-cleaning sensor system in your EOS camera, how should you hold the camera for the best results?

You needed to select from one of the four answers: lens pointing forwards, lens pointing up, lens pointing down or portrait format. The correct answer is lens pointing forwards, the reason is that at the bottom of the mirror box in front of the sensor is a sticky pad, it catches the dust and debris shaken off the sensor during cleaning. If you point the lens down then the dust collects on the shutter curtains or back of the lens and as soon as you tip the camera back up then the dust goes back to the sensor. Probably the best example of the effectiveness of the built-in self cleaning sensor is a comparison between the original EOS 5D and the EOS 5D Mark II, the older camera had a reputation for being a dust magnet, the EOS 5D Mark II with the self-cleaning sensor is nowhere near as bad. The self-cleaning sensor reduces the build-up of dust over time and this is the key to it’s success.

Change in the quiz

The sharp eyed will have noticed we have changed the post round so the question is at the top, the sharp thinkers will also have noticed that last week we had a post with answer #9, and this weeks post is #11. Obviously #10 is in there somewhere, but needed to get passed by in the change round.

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