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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 18 Jan 2010 (Monday) 20:11
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not happy with focusing with my sig 24-70 2.8

 
beezwax
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Jan 18, 2010 20:11 |  #1

has anyone experienced focusing issues with this lens?

When I select a manual focus point and get the go ahead to shoot... the pic just doesnt seem sharp.


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javig999
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Jan 18, 2010 23:20 |  #2

It happen sometimes, and I try to chalk it up to it the shooting conditions or user error. Overall It seems to focus pretty spot on. I use the center point pretty much exclusively.

Having never owned a USM (HSM, etc) lens I don't know any better either. It looks like you may have been spoiled by that 70-200L!!!

Best of luck...


90D 7D SL1 | 8mm 3.5 FE | EF-S 10-22 | EF-S 17-55 | EF-S 24mm 2.8 | EX 30mm 1.4 | EF 85mm 1.8 | EF 100mm 2.8 Macro | EF 70-200 f2.8 IS MkI | 2 x YN 600EX/E3-RT | Manfrotto 293/SBH-250 | Dolica monopod/SBH-30

  
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kay188
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Jan 19, 2010 00:56 |  #3

The Sigma 24-70 F/2.8 EX Macro version is known for it's poor focusing.
However, if focused spot on, it's sharpness is very good wide open.

I've taken mine into service about 3 times, and once by the previous owner before as per the records.
Every time, the report coming back saying "calibrate for front/back focusing".

I've even given my body for them to be calibrated to. Still a no go.
My most recent service was "calibrated for slight back focusing".
Guess what. Now it keeps front focusing.
I've done a manual focus test, and overrided the autofocus after it focuses to focus it back very slightly. My override comes out sharp.

I mean 10 years warranty, why stop trying to get it right? Ahahaha.


Ricoh GRD4 | Canon 1Ds, 1D, 1D2, 1D2n| Canon XTi | Tokina 11-16 F/2.8 | Canon 16-35L I | Canon 24 F/2.8 | Canon 35 F/2 | Canon 50 F/1.8 I | Canon 135L | Sigma 24-70 EX DG Macro | Sigma 70-200 F/2.8 APO EX DG | Sigma 30 F/1.4 |Sigma 50 F/1.4 |Sigma & Kenko 1.4x TC| Canon 580EX II | Sigma EF-500 Super | 2x Vivitar 285HV | RF-602 Triggers |

  
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Olly_K1
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Jan 19, 2010 08:46 |  #4

I've never had a problem with my one (non HSM). On my 500D it worked great and on my 7D i did have to microadjust it a bit. Does it happen just in manual focus or auto too ?


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Canon 1D MKIV | Tokina 11-16mm f/2.8 | Canon 24-70mm f/2.8 L | Canon 70-200mm f/2.8 L |Canon 400mm f/5.6 L | Canon Speedlite 430EX II

  
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beezwax
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Jan 19, 2010 10:23 as a reply to  @ Olly_K1's post |  #5

auto focus only..... maybe I'll try a different meathod of focusing


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cdifoto
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Jan 19, 2010 10:29 |  #6

Many folks graduate from the Sigma (or Tamron) to the Canon for this very reason (rather than sharpness or build). I suspect it's also why Sigma finally brought an HSM variant to market not too long ago.


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not happy with focusing with my sig 24-70 2.8
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