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Archive 2015 · 7D2 + 100-400 II + 1.4 III

  
 
Zenon Char
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p.1 #1 · p.1 #1 · 7D2 + 100-400 II + 1.4 III


My lens and body are almost bang on at 400mm. When I add the 1.4 it requires MFA of +14 @ 400mm. I'm not saying it is a problem. It is what it is. I have read on other sites people needing high numbers over +10 as well.

Thought I'd do a survey. Thanks advance for your participation.

PLEASE NOTE: The Total Focal Length Is 560mm

Edited on Oct 01, 2015 at 05:28 PM · View previous versions



Oct 01, 2015 at 05:02 PM
Jeff Nolten
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p.1 #2 · p.1 #2 · 7D2 + 100-400 II + 1.4 III


Can't contribute to your pole. But you might want to change the pole title to

"How many MFA tics does you combo need @560mm?"



Oct 01, 2015 at 05:05 PM
Zenon Char
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p.1 #3 · p.1 #3 · 7D2 + 100-400 II + 1.4 III


It does not look like it will let me in the actual poll title but I will make edits. Thanks for the heads up.


Oct 01, 2015 at 05:25 PM
arbitrage
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p.1 #4 · p.1 #4 · 7D2 + 100-400 II + 1.4 III


Mine is -11W and -5T and that took me a lot of time back in Feb/Mar to finally nail the sweet spot. In contrast my 7D2 Sigma C and 1.4TCIII needs +35 or maybe more so I wouldn't worry too much about 14.


Oct 02, 2015 at 08:46 AM
Zenon Char
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p.1 #5 · p.1 #5 · 7D2 + 100-400 II + 1.4 III


5 zeroes. Usually these surveys come with a few responses. I know of at least 3 that needed more than 10. I thoroughly tested again last night on my 5D3 and am getting almost 0 and still +14 on the 7D2. I don't really care. Mostly curios. I'm just helping out someone else who is interested as to why.

Thanks to those who have participated so far.



Oct 02, 2015 at 08:50 AM
Zenon Char
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p.1 #6 · p.1 #6 · 7D2 + 100-400 II + 1.4 III


arbitrage wrote:
Mine is -11W and -5T and that took me a lot of time back in Feb/Mar to finally nail the sweet spot. In contrast my 7D2 Sigma C and 1.4TCIII needs +35 or maybe more so I wouldn't worry too much about 14.


Interesting. Thanks for the info. I'm not worried at all. My bare lens and bodies are almost right on. Not much you can do adding a TC. It is what it is. There is quite a difference between my 5D3 and 7D2 so just mostly curious.



Oct 02, 2015 at 08:55 AM
Zenon Char
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p.1 #7 · p.1 #7 · 7D2 + 100-400 II + 1.4 III


Not sure how many are interested but I just in case I tested my 300L F4 IS using focal.

No TC +4

With TC +5

I re-tested my 100-400 again with focal. Previous visual test after visual test, angled ruler, flat targets and focal all say the same thing with the TC. +3 at 140 and +14 at 560. Actually focal was +15. Without TC about +4 at 400.

I came across this today.

http://www.lensrentals.com/blog/2009/01/teleconverters-101

Here are two shots with the TC on and off and 100-400. This is consistent no matter what I try.

0 MA

~original[/IMG]

+14

~original[/IMG]



Oct 04, 2015 at 01:31 PM
charlyw
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p.1 #8 · p.1 #8 · 7D2 + 100-400 II + 1.4 III



Here are two shots with the TC on and off and 100-400. This is consistent no matter what I try.


Pretty much invalid test scenario. The focusing target must under all circumstances be absolutely parallel to the sensor plane! Any slanting will mess up the test result and result in an invalid calibration!



Oct 04, 2015 at 01:37 PM
Zenon Char
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p.1 #9 · p.1 #9 · 7D2 + 100-400 II + 1.4 III


Let's forget the ruler then. It doesn't make any difference. All flat parallel targets I tested which included dollar bills for detail viewed 100% on the LCD, at 100% in DPP, Focal and all real world results all show the same thing.


Oct 04, 2015 at 02:01 PM
Zenon Char
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p.1 #10 · p.1 #10 · 7D2 + 100-400 II + 1.4 III


If I were were the only then would conclude I'm doing something wrong but a person at POTN is reporting 0 at 140 and +12 @ 560. Others have mentioned high numbers as well. Len Rentals said f8 is not great for zooms and TC's are tuned for long primes. The 100-400 is an awesome lens. I'm not trying to start a bad focus thread. I'm just curious.

Based on what lens rentals says perhaps a small difference in normal body and lens tolerances can throw a zoom at f8 out a lot. Exponential error. It is really not an error, just normal tolerances that will be exploited in a certain direction. A lens and body both the minus range, a lens and body both in a plus range and both opposite can cause different results how the light waves move trough the TC and lens even when final results being +3 or +14 look good. Just guessing. I'm not an engineer. I know it surprised me.

My 300L F4, same body, same TC showed +4 @ at 300 (no TC) and +5 @ 420.



Oct 04, 2015 at 02:20 PM
Tom_W
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p.1 #11 · p.1 #11 · 7D2 + 100-400 II + 1.4 III


-12 for the 1.4 Mk III, but only on the 100-400 at the long end. It's near perfect on the 500/4.

Might try testing the 100-400 alone. I've never felt a need to check it though.



Oct 09, 2015 at 08:09 PM
scalesusa
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p.1 #12 · p.1 #12 · 7D2 + 100-400 II + 1.4 III


TC's are just like any other lens, and can be off. I'd send the combo to Canon and let them take a look. A range of +/- 5 is pretty nominal and in spec. You have three variables in play with a TC.

The camera can be plus or minus 5, the lens the same and the TC likewise. If they all line up to the worst case, a error of 15 pts might be possible even if each part is in spec.

Also, the Camera firmware contains corrections for each Canon lens, its not a simple or straight forward situation.

Be very careful of your test setup, but I believe your numbers, so get it fixed.



Oct 12, 2015 at 10:28 AM
Imagemaster
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p.1 #13 · p.1 #13 · 7D2 + 100-400 II + 1.4 III


MA makes such a small difference that it is hard for me to see the difference at values of less than 10.

In this example, it appears to me that 0 is the sharpest, and that +10 is just slightly sharper than -10, therefore I just set it at +5.









Oct 12, 2015 at 04:13 PM
Zenon Char
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p.1 #14 · p.1 #14 · 7D2 + 100-400 II + 1.4 III


Imagemaster wrote:
MA makes such a small difference that it is hard for me to see the difference at values of less than 10.

In this example, it appears to me that 0 is the sharpest, and that +10 is just slightly sharper than -10, therefore I just set it at +5.



Rudy Winston says that as well.

http://s33.photobucket.com/user/Zenon1/media/MFA/canon_zpsj2dw6j2j.jpg.html?sort=3&o=0



Oct 13, 2015 at 07:03 PM
Zenon Char
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p.1 #15 · p.1 #15 · 7D2 + 100-400 II + 1.4 III


scalesusa wrote:
TC's are just like any other lens, and can be off. I'd send the combo to Canon and let them take a look. A range of +/- 5 is pretty nominal and in spec. You have three variables in play with a TC.

The camera can be plus or minus 5, the lens the same and the TC likewise. If they all line up to the worst case, a error of 15 pts might be possible even if each part is in spec.

Also, the Camera firmware contains corrections for each Canon lens, its not a simple or straight forward situation.

Be very
...Show more

Based on that article I tried the TC on my 300L F4 IS. I got a difference of +1 between bare lens and TC. It appears the TC is sound.



Oct 13, 2015 at 07:06 PM





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