A mirror reflects light, it doesn't make an image from it. Optically, an
object that is being reflected in a mirror is the same distance from the
film plane in your camera as it would be if you were standing the same
distance behind the mirror as you are standing in front of it. Think of
the mirror as a doorway you are taking a picture through.
Hugh Turnbull
Phillip Franklin wrote:
>
> I'm sure some of you optics experts can help me here. I was making a feeble
> attempt at
> shooting a self portrait by shooting my reflection in a wall mirror with the
> 135 mm lens.
> While focusing I noticed a unique phenomena which puzzled me a bit. I was
> standing about 6
> feet from the mirror. While I was in focus, objects a few feet behind me (in
> the mirror)
> were not. I would think that since the mirror is a flat surface all of the
> objects in this
> reflection would be on the same distance from the camera, hence be in focus.
> I've never
> thought of this phenomena before. I guess the mirror is only acting a bounce
> off plane so
> that the actual optical distance would be the twice the distance to the
> mirror (the true
> distance of the travel of light). I'm sure this goes by some fancy name. Am
> I explaining
> this correctly?
>
> Also are any of you experieced at shooting self portraits into a mirror? I
> know it is a
> strange thing to do, but it seems interesting.
>
> Phillip Franklin
>
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