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I just got a new (to me) Nikon D70s to see if the DSLR world is right for me. My dad took this picture of me:

The food is hot!

In the middle of the bottom there's a rather large semicircle of shadow. Is this caused by the built in flash? If so, how can I avoid it (if I keep using the flash). Interestingly enough, when I shoot portrait instead of landscape, the semicircle doesn't appear.

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It is disheartening that this image was tainted with the poor shadow, as this capture of you is phenomenal. –  dpollitt Dec 4 '13 at 3:35
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Take heart, for a bit of cropping should preserve the phenomenon, however. –  ElendilTheTall Dec 4 '13 at 9:34
    
Just like to add - removing that shadow (or reducing how noticeable it is) could be achieved quite quickly in Photoshop (or similar) - definitely worth the effort on such a keeper. –  dav1dsm1th Dec 4 '13 at 11:04
    
Looks like the shadow of a finger partly obsuring the flash. This is can be easy to do on some cameras with built-in flashes, especially for someone not familiar with the camera. –  Olin Lathrop Dec 4 '13 at 15:06

2 Answers 2

up vote 16 down vote accepted

The most typical reasoning for this circular obstruction is the use of a lens hood that is obstructing the flash. It could also be caused by a rather large lens itself getting in the way as well. A similar effect can be found when a wide angle lens is used that is beyond the coverage of the flash.

I would consider what lenses you were using, at what focal length, and with or without a lens hood. Adjust the combination of these things and you will resolve this issue. It is of course possible that you will have to remove the lens hood to effectively use the built in flash. Alternatively you could use an external flash mounted on the hot shoe(Yongnuo option), or off camera by using any one of a number of techniques to get the flash further from the lens(this will also improve other aspects of flash beyond resolving this issue).

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In my personal experience on a similar APS-C camera, I had to remember when I used my 10-22mm lens to not also use the flash - or the shadow became a serious issue. I would guess anywhere below about 17mm on your D70S you might have shadows with a standard sized lens(no hood). But I have not performed any scientific tests, just going off of memory here. –  dpollitt Dec 4 '13 at 3:37
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Yeah, I only have the one lens (18-70mm), and it seems after a few more tests that even a shot at 18mm has the shadow. After reading a few answers on here I'm definitely going to be looking into some prime lenses as I get some more experience (and funds ;) –  Wayne Werner Dec 4 '13 at 12:19
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If this shadow is what you are worried about, investing in a decent flash gun might be an idea as well. There also are decent 3rd party flashes available that don't hurt as much, financially speaking, as the Nikon ones probably do (I'm a Canon guy)/ –  Cornelius Dec 4 '13 at 14:25
    
@Cornelius - This is the Nikon 3rd party flash that I would look at - amzn.com/B006R6TUJI , Only $100 USD! –  dpollitt Dec 4 '13 at 14:31
    
Looks like the Nikon version of my flash, which I find pretty good. :) –  Cornelius Dec 4 '13 at 14:42

The shadow is most likely from the lens/lens hood which block part of the beam from the flash, since build in flashes are generally not high enough to reach above many of the lenses/lens hoods.

I would probably consider to use something that you can put in front of the flash that can bounce the beam to a ceiling, if you are indoor and the ceiling is not too far away. For example a business card or something similar should do the trick.

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While this is a good way to fix the problem, it doesn't actually address what causes it, which is what the main question asked for. If you fill out your answer with that information, it will be good but right now it feels like it doesn't really address the question of what is causing it. –  AJ Henderson Dec 4 '13 at 14:22

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