Photo distortion question

[Martin Naef]

Still makes sense to me. Remember that the camera can "look around the 
corners" on the out-of-focus regions - the amount of which is defined by 
the aperture. (This also explains why it's impossible to achieve perfect 
depth-of-field simulation as a post-process if all you have is a 2D 
image with depth). What you see in the photo really is part of the dark 
side of the glass, resulting in the dark "halo". How much you see of the 
"dark side" depends on the focal plane.

There are a few internal reflections that you can see in the video (did 
you use a UV filter?), but I don't think they have anything to do with 
the dark halo that you're wondering about.

Martin


On 14.12.2010 10:52, Andrew Tarpinian wrote:
> Ok check this out, video of the same shot more or less, look what
> happens on the right side when the focus changes, that same thing is
> what I think is going on in the still image.
>
> http://www.polaritydesign.com/photos/amsterdamfocus.mp4
>
> On Dec 14, 2010, at 4:09 AM, Martin Naef wrote:
>
>> On 14.12.2010 06:43, Andrew Tarpinian wrote:
>>> http://www.polaritydesign.com/photos/amsterdamfocus.jpg
>>>
>>> Any idea what is the cause of that separation on the right side of the
>>> candle holder and the orange background lights? Is it a lens or a camera
>>> thing?
>>
>> My bet is also on the material property of the glass. At that angle,
>> there is probably no light being scattered to the camera from the candle
>> inside. So the only potential light sources would come from outside -
>> but there probably isn't any lamp to the right, and nothing bright that
>> could be reflected. There is obviously a bright source on the left side,
>> hence you don't see the effect there.
>
>
>
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