What is the Dipolder 2, and 3?

[Belmont]

It would have to be a very short burst of light to freeze the divers bubbles, anything longer than 1/100th of a second would make them appear fuzzy.

 

[Gombessa]

Film negatives must have some EXIF info we could check, right? Nothing could be that primitive

 

[diverlee]

Thanks for the link to the picture

 

[SparticleBrane]

The way you do a picture like that is to mount the camera and leave the iris open. You then swim to the different locations using a penlight always pointed away from the camera, then light what you want added to the frame for a precalculated period of time and shut off the photo light. You then swim to each of the other locations and repeat.

Most cave shots like that are done with slave strobes. The method you posted is much older and antiquated...and works better at night in the dark, not in a cave. It would be quite difficult to keep the camera still long enough for an exposure like that underwater, depending on flow conditions...