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Honored Contributor
Posts: 5,449
Registered: ‎08-13-2015

Re: Focus problem with 600 mm IS 2 plus 1.4 and 2.0 TC's

I use 50x the fccal length, and a tape measure.  If you are careful about measuring the distance, you should get the nearly the same composition and framing of the target, no matter the focal length that you are testing.

The light conditions can affect the camera's ability to focus, especially artificial lighting.  Take a series of shots, and use the average.  If technique is good, than your results should be fairly consistent from test shot to shot.  Ignore the high and low extremes, and average the results.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Occasional Contributor
Posts: 11
Registered: ‎09-10-2017

Re: Focus problem with 600 mm IS 2 plus 1.4 and 2.0 TC's

Hi Tim, Do you have an email address I could send them to?
Kind regards
Charles
VIP
Posts: 8,128
Registered: ‎12-07-2012

Re: Focus problem with 600 mm IS 2 plus 1.4 and 2.0 TC's

Charles,

You have a $12,000 dollar lens and expensive t-cons to go with it.  If you bought this lens new it has a warranty.  If you bought it used, in either way, you need to send it to Canon.  They will do a C&C on it.  This is the only way you are going to be sure it is right.  None of this fooling around with focus adjustment is going to work.  At the very least call Canon support and get ahold of a guy that actually uses one of these behemoths. Some of their techs don't !  From what you have posted I don't get the feeling you have experience with one of these super teles either.  Call Canon and/or get the C&C. 

A lot of Canon stuff. Along with, a lot of other stuff.
Esteemed Contributor
Posts: 3,090
Registered: ‎06-11-2013

Re: Focus problem with 600 mm IS 2 plus 1.4 and 2.0 TC's

Charles,  I sent you a Private Message via the forum with my email address.  You should see a very tiny envelope icon near the top of the page (it's not obvious) and you can click that to get to your private messages.

 

Best Regards,

Tim

 

Tim Campbell
5D III, 5D IV, 60Da
Occasional Contributor
Posts: 11
Registered: ‎09-10-2017

Re: Focus problem with 600 mm IS 2 plus 1.4 and 2.0 TC's

Sorry Tim been away for a couple of days. I sent you an email with some  strange results of checks I did. Also tried sending you 3 images but  for some reason 2 of them were returned as undeliverable.

 Regards

 Charles

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