SoCalTiger wrote in post #14964355
I see it. Someone posted something like this a while ago. I think the conclusion was that because you are shooting into a light source, you can see the reflection of the light bouncing off the mirror.
During the taking of the picture, the mirror is flipped up, there is no reflection from it.
This is normal flare when shooting into the light, massively overexposed and then seeing some reflections and loss of contrast in the dark areas. The image of the chime in the filter picture is because the chime is a shadow in the bright part so the reflected light off of the sensor and back off of the filter will have a shadow in it the shape of the chime.
The unfiltered shot is much better since you get rid of a reflection surface and some light scattering. All lenses will flare at a least a little if you overexpose a large bright area hard enough with dark areas elsewhere in the frame but filters make it much worse. Unfortunately a lens hood wouldn't help this image because the light source is inside the frame but a hood is a good idea anyway for other cases where the light is outside the frame but still landing on the front element.
This is why it is so important to remove filters during backlight situations or when there are light sources within or just outside of the frame. Also look how much sharper the unfiltered shot appears, especially around the gold work.