Lens reflections
Following a discussion with NFB on lens reflections, I have taken a series of pics as the best way to explain it.
Essentially it is down to angles. The key one being the taking lens toward the camera subject. In the three lens composite you can see that too sharp an angle will produce no reflection from the coating and will appear as crystal. The demarkation line is quite abrupt. These appear on the left hand lens in each case. This effect is very visible in an SLR viewfinder. Flash will not change it.
All of the pictures were taken with the camera in a fixed position and light provided by a single diffused flash positioned in front of the centre lens, square on 2 feet away.
Lenses were moved around to show that coating colours have different colours depending on angle.
Two further comments.
The white spots on the lens top right are reflections from a camera body positioned behind the centre lens.
On the middle row, mirror lock up and viewfinder blind were used to show that light through the viewfinder has no effect.
Don
|