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FORUMS Photography Talk by Genre Macro Talk 
Thread started 30 Mar 2018 (Friday) 09:40
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macro lens problem

 
stoat
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Mar 30, 2018 09:40 |  #1

Please can anyone help with a very strange problem. I was using a Sigma 50mm 1:2.8 DG Macro on Canon 5d mk iv Took three shots all at the same setting - all fine then took three more still at the same setting, no adjustment, exposure meter correct, and got a completely white, over exposed shot each time. I was using Manual so thought I would just try P mode to see what happened and the same, over exposed shot. Is it time for a new lens or am I missing something staring me in the face.




  
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Left ­ Handed ­ Brisket
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Post edited 1 month ago by Left Handed Brisket.
     
Mar 30, 2018 09:48 |  #2

I've seen issues with aperture blades not stopping down when my battery was running low.

Are you using flash?

Were you trying to shoot way stopped down?


Doesn't sound like a macro specific issue to me, have you just fired off a bunch more test shots around the room?


PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20

  
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stoat
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Mar 30, 2018 10:01 as a reply to  @ Left Handed Brisket's post |  #3

no flash and each image was at f19 - same settings, same metering. Other lens work fine




  
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Left ­ Handed ­ Brisket
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Post edited 1 month ago by Left Handed Brisket.
     
Mar 30, 2018 10:23 |  #4

Battery condition?

Might look at lens contacts too.

I was talking about test shots with same lens. Sometimes weird things happen and just magically go away.


PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20

  
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stoat
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Mar 30, 2018 10:33 as a reply to  @ Left Handed Brisket's post |  #5

battery fine apparently canon and sigma sometimes have problems on newer cameras so maybe that is it




  
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Wilt
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Mar 30, 2018 11:38 as a reply to  @ stoat's post |  #6

Run two very simple tests to see if aperture stops down properly...


  1. Press the Depth of Field Preview button, and look into front of lens to see diaphram close down
  2. Put camera in Manual mode, select slow shutter speed (> 1/8 sec) and press shutter release and look into front of lens to see diaphram close down

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Bassat
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Mar 30, 2018 11:56 |  #7

Any chance you accidentally dialed in +5 EC (or something close)?


Tom,
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stoat
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Mar 30, 2018 12:33 as a reply to  @ Bassat's post |  #8

no chance !




  
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Wilt
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Post edited 1 month ago by Wilt.
     
Mar 31, 2018 20:01 as a reply to  @ stoat's post |  #9

Did you try to do to two tests -- repeatedly -- what I suggested in post 8, to see if the lens is getting signals from the body consistently to stop down the aperture?


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stoat
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Apr 01, 2018 08:44 as a reply to  @ Wilt's post |  #10

yes tried the tests and it worked fine - then it didn't ! same image, same exposure 1st correct exposure, 2nd way over exposed (but exposure compensation gauge still showing as 0) . With diaphram tests - same problem, 1st time worked then didn't. So definitely think its a compatibility problem. Also tried same test with my Canon 100mm macro and worked perfectly each time. Anyone want to buy a Sigma macro !!!




  
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Wilt
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Apr 01, 2018 11:49 |  #11

stoat wrote in post #18598140 (external link)
yes tried the tests and it worked fine - then it didn't ! same image, same exposure 1st correct exposure, 2nd way over exposed (but exposure compensation gauge still showing as 0) . With diaphram tests - same problem, 1st time worked then didn't. So definitely think its a compatibility problem. Also tried same test with my Canon 100mm macro and worked perfectly each time. Anyone want to buy a Sigma macro !!!

If a press of the DOF Preview button is inconsistent with the Sigma, yet consistent in operation with the Canon lens, it is a clear indication of some issue of the Sigma not getting the signal from the body. Got a friend or store with 5DIV, where you can try the lens on that body?


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macro lens problem
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