Paranormal photography is a very tricky thing.   With the birth of Photoshop and similar programs, it is almost impossible to take a para photo and not have it debunked on the spot!   However, there are a few photos taken over the last 100 years which are very interesting.   Some they can not quite explain.

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Along with Photoshop, things such as dust, bugs, light glare, camera flash, slow shutter speed, bad development, reflective surfaces, you name it....can be the cause of an unusual photo.