can this be used as a slave flash?

[jsust]

If so, how?
DSC_9781 | Flickr - Photo Sharing!
DSC_9780 | Flickr - Photo Sharing!

 

[Josh66]

Yes, and this is one way how:
Metz Mecalux 11 Auto Hot Shoe Slave MZ 5368 B&H Photo Video

 

[jsust]

i know i can buy an attachment but what is the red sensor for? is it only for focusing? or is it an optical trigger?

 

[Josh66]

i know i can buy an attachment but what is the red sensor for? is it only for focusing?

Probably.

or is it an optical trigger?

Doubt it.

 

[Designer]

The red lens looks more like an AF-assist light.