AI Servo

[ben_rubinstein___mancheste]

How would I use AI with an Elan IIe (set to ECF) and a 420EX for a

relatively fast moving situation, i.e. a wedding, crowded street,

succesfully? Or should I not bother?

[vandit]

What are you trying to do? If you want just well-exposed subjects, set the camera to "P" mode (NOT Av or Tv modes, where the camera tries to expose the background properly as well, resulting in much slower shutter speeds) and fire away. The flash will freeze motion to a significant extent.

[vandit]

Ugh - misread your question. Sorry.

 

I imagine you should be able to use AI servo pretty much the same way as you would use it without a flash. When you take the photo, the camera will fire 2 flashes - the first is used to estimate exposure, the other to actually expose the film. That way, not only is the focus determined at the time of clicking, but so is the exposure itself.

 

Locking FEL is what would throw your exposure off, if the subject-to-camera distance changes.

 

HTH

[Ken Katz]

Works fine, I use this set up for shooting indoor soccer. For really fast motion and dark environments (focus assist lights are deactivated in servo mode), the center focusing sensor works best.