Thanks MattKing! This has been really helpful!

Quote Originally Posted by John Koehrer View Post
The lens looks like a sensor, but there's no obvious way to turn the auto exposure on or off.
If the lens is a sensor, what is it doing? Would it be backing off the flash power when it senses ambient light?
I believe this CY-20 is equivalent (read identical) to this Metz:
There's no manual with this and there's something weird about an "Auto Flash" not doing anything automatically..

Ps: Only buttons on this is On/OFF and TEST. All of which carry their obvious functions.