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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 03 Sep 2010 (Friday) 12:34
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7D + Sigma 100/300 + Sig x1.4 probs

 
Shultz
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Location: Suffolk, UK
     
Sep 03, 2010 12:34 |  #1

Going to Duxford tomorrow & decided to micro adjust my 100-300 f4 + x1.4 extender ready for action :)

First prob I notice is that the 7D only shows the already microadjusted 100-300 when the extender is added, is this right can I only have one adjustment per lens regardless of extenders or not?

Secondly I've noticed that with the above combo on it will only auto focus about 50% of the time & when it doesn't find focus it seems to lockup & won't find focus on anything at any distance unless I move the focus ring myself slightly then its fine again until it doesn't find focus & the above startss again?

I have had the extender a few years so wondering if its chip (if it has one?) isn't quite right with the 7D as the combo is f5.6 so should still autofocus?

Have to say without the extender the 100-300 works beautifully & focuses everytime, was just hoping to use the 420mm

Is it a call to Sigma or something else?

Many Thanks,

Shelton.


http://www.onebriefmom​ent.co.uk (external link)
7D ~ 17-55 f2.8 EF-S ~ 100mm f2.8 Macro ~ 50mm MK I ~ Sigma 100-300 f4 APO EX DG ~ TC x1.4 ~ Man 055XPROB & 488RC2 ~ NISSIN Di622

  
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twoshadows
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Sep 03, 2010 15:03 |  #2

Have you tried the tc with your 7-2 f/4 IS? Give that a try and see if it works...


xgender.net (external link) Miss Julia Grey - please refer to me as she/her/Miss
Nikkor 28/2, 35/2.8-PC, 55/1.2 | Vivitar 55/2.8 macro | Voigtländer 50/2.8 | Olympus 75-150/4 | Tamron SP 28-80, SP 60-300, SP 300/5.6 | Pentax SMC Takumar 135/2.5, 200/4 | Canon 24mm TS-E II | Lensbaby Composer Pro II w/Sweet35mm & Edge50mm | Meyer-Optik Gorlitz Oreston 50/1.8 | Canon 5DIIx2, 5D, 20Dx2 | Sigma 12-24 | Canon 28-105 II, 85/1.8 | Yongnuo 50/1.8

  
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Shultz
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Sep 03, 2010 15:49 |  #3

Hadn't thought of trying that! Just did so & granted indoors/poor light but trying both they see to have problems.....

I'll leave it at home tomorrow & have a look using the 70/200 in good light & see whether it does the same

Thanks for the help

Shelton.


http://www.onebriefmom​ent.co.uk (external link)
7D ~ 17-55 f2.8 EF-S ~ 100mm f2.8 Macro ~ 50mm MK I ~ Sigma 100-300 f4 APO EX DG ~ TC x1.4 ~ Man 055XPROB & 488RC2 ~ NISSIN Di622

  
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phreeky
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Sep 03, 2010 18:21 |  #4

Does the extender have the extra pins that are needed to report it being there (on the lens side)? If not the lens wont know an extender is fitted and therefore the camera will not know either.




  
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Shultz
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Sep 04, 2010 00:35 |  #5

It worked ok on my 40D, now leaving for Duxford so will have a look/play tomorrow :)

Shelton.


http://www.onebriefmom​ent.co.uk (external link)
7D ~ 17-55 f2.8 EF-S ~ 100mm f2.8 Macro ~ 50mm MK I ~ Sigma 100-300 f4 APO EX DG ~ TC x1.4 ~ Man 055XPROB & 488RC2 ~ NISSIN Di622

  
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NinetyEight
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Sep 04, 2010 06:39 |  #6

It's just a myth, like the 60D... :-)


Kev

  
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7D + Sigma 100/300 + Sig x1.4 probs
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