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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 18 Oct 2009 (Sunday) 22:37
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7d + 17-55 IS lens

 
tipt
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Oct 18, 2009 22:37 |  #1

At certain focal lengths, I get a half moon shadow when I use my on board flash. Is that normal? Is it because I the flash is too small for the lens?




  
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kay188
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Oct 18, 2009 22:38 |  #2

Yes.

The on board flash gets blocked by longer lenses when you're shooting wide because the lens is long, and the flash is too close to the lens.


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slr_noob
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Oct 18, 2009 22:39 |  #3

Sounds like the flash sticks out too much for the built-in flash.


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wdwpsu
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Oct 18, 2009 22:41 |  #4

I haven't played with this much. But when this happens, can the flash still remote trigger other flashes or does the partial block impede it's ability to do that?


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AKHOO
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Oct 18, 2009 23:34 |  #5

I have the same problem with the 17-55 IS on my 500d. You need to zoom in (towards 55mm) to prevent the shadow. It only happens at the wide angle.


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mrkgoo
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Oct 19, 2009 01:44 |  #6

Also depends on whether you have the hood or not. And you should have the hood.




  
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apersson850
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Oct 19, 2009 01:55 as a reply to  @ mrkgoo's post |  #7

Unless you have your slave flash right in the shadow of the lens/lens hood, and you are outdoors with nothing for the command flash to bounce from, then yes, it could be a problem.
Otherwise, no.

For normal flash photography, I dare say that if you invested a good deal of money in the very good EF-S 17-55 mm f/2.8 IS USM, you shouldn't spoil that with a straigt-on internal flash picture.


Anders

  
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Kaigler
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Oct 19, 2009 01:58 |  #8

mrkgoo wrote in post #8849023 (external link)
Also depends on whether you have the hood or not. And you should have the hood.

Even with a hood you will get the shadow on the wide end. I bought the Canon 270 EX flash and I still get the shadow. Its kind of lame. Need a new flash :)


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apersson850
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Oct 19, 2009 02:03 as a reply to  @ Kaigler's post |  #9

Bounce the flash when possible. Takes care of the shadow.


Anders

  
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rkkwan
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Oct 19, 2009 02:11 |  #10

Only time I have used or I will use the built-in flash on my 400D/40D/7D with the 17-55IS (or any other lens) is for fill-flash in extreme back-lit situation AND if I don't have my 430EX. In that case, the flash is used to brighten the face, so the shadow in the bottom won't matter as long as I shoot in landscape orientation.

As for the hood, I think mrkgoo means one should shoot with the hood on most of the time, EXCEPT when using the built-in flash.


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mrkgoo
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Oct 19, 2009 03:09 |  #11

Yeah, I meant you should always own a hood. Taking it off to lessen flash shadow is acceptable. :p




  
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tipt
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Oct 19, 2009 07:33 |  #12

Thanks! Good to know.




  
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Rabies
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Oct 19, 2009 11:02 |  #13

Stupid trick: when this is a problem, hold the camera upside down. Then the shadow of the lens is cast upwards (into the sky or something else that doesn't matter) instead of onto the ground.


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7d + 17-55 IS lens
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