creators
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Help, waaaa, help!Leah just came over and asked me if her camera was messed up because she is getting these dark semi-circles at the bottom of the picture when she uses the flash close up, only for us to try my camera and discover I get the same. Why?
Exposure time: 1/60
F-stop: 3.5
ISO speed: 200
Focal length: 18.0000
Focal length (35mm): 27
Flash: Fired
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micro-leah.
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this only happens when we were not zoomed in, if we zoomed in it was fine. and like keith said it only happens when taking a picture close up. help 
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jonH
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1) is your lens hood attached?
2) what diameter is your lens?
the dark semi circle is the shadow cast by either your lens hood or the end of your lens- i get it with on-board flash with all my 77mm diameter lenses (ie all my expensive ones!!)
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micro-leah.
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but it only happens when it isnt zoomed in, if it was a shadow from the lense it would happen more if it was zoomed in ie lense extended
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Simonzphotoz
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I think its just your big heads getting in the way!!
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hil26
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I can only agree with Jons statement, but have no idea why it will only do it when the lens is not extended
Strange
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micro-leah.
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yeah im totaly confused. that was my first thought and you guys may well be right. hmmmmmmm
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carlj
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I'd say it's lens shadow. Remember, at extreme wide angles, the hood or even the lens body will cause the flash to cause the shadow, due to the angle of view. Try the same shot at a longer focal length (ie, smaller angle of view) and it should disappear.
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Evolution104
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| Simonzphotoz wrote: | | I think its just your big heads getting in the way!! |
 
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Evolution104
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Jon and Carl are right.
It's a shadow of the lens due to the wide focal length (18mm). Turn the camera 90 degrees and do a portrait (vertical) shot and the shadow will move to the side of the photo. Canon cameras are notorious for this.
Zooming in changes the focal length and narrows the angle of capture so the shadow from the lens is no longer in the imageable area.
Some flash units offer a built-in flash lens that fits over the flash to compensate for this by focusing the light in a broader and narrower beam. My Olympus flash has one. Or you can use an off-camera flash.
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Gilly
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Evo is exactly right........
Even though your lens extends with the zooming in, the angle of vision reduces more than the zoom of the lens.... hence why you aren't seeing it anymore.
Try the vertical theory to prove Evo's point!
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creators
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Thanks every one, that was very disconcerting. We did discuss whether it was the lens but couldn't work it out. Funny how it all seems so logical when other people explain it. Thank you one and all. Simon, that was actually an option we looked at, whether it had been caused by a light behind Leah when she took the pictures that started it all off. But you're still a ratbag. 
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jonH
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time for an sb-800 or two ;)
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creators
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| jonH wrote: | | time for an sb-800 or two ;) |
Thanks for putting this post up Jon. I have not up till now considered a decent mounted flash unit or heard of the sb-800. Ouch, nice price... Dear Santa...
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jonH
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the sb600 is also quite good but from what i understand you can control multiple 600s with an 800.. not that i understand very much about flashguns..
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hil26
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The 800 is a beast - expect a great big learning curve - not least on how to use it remotely.
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