I am using a canon eos 350D (rebel XT) with a Canon 100mm macro lens in an Ikelite housing. I am using Ikelite strobes (DS50+DS125) and I have a problem when using the macro lens.
When I am taking picture underwater I sometimes have a problem of the lens stops talking to the housing and the apeture appears as 'OO' in the viewfinder.
Has anyone else has this problem, and if so, is it curable?
I have had this problem several times and I think I've got it under control.
Apart from dirty contacts, other possible causes are:
- wet contacts, caused by condensation in the housing. To avoid this, do the usual stuff - put some dessicant inside the housing. Assemble the housing in advance of the dive, so that the dessicant has time to work. Don't allow the camera to heat up in the sun. etc
- accidentally depressing the lens release. On the Ikelite SLR housings for Canon 20D and 350D etc, there is a small lever on the left side (below the large knob for the zoom gears) that is used to depress the `depth of field preview' button on the camera. The lever is also designed to be rotated through 180 degrees to engage with the lens release button on the camera body, so that you can change lenses after opening the front lens port. When you assemble the housing, make sure that the lever is not waving around inside the housing near the lens release button! Otherwise when you descend at the start of a dive, the increasing pressure may force the end of the lever to gently depress the lens release button, and hey presto, no communication with the lens. If you get Aperture 00 during a dive, or if the camera ceases to respond to everything except on/off switch, my suggestion is to try gently rotating the lever AWAY from the camera body. It's worked for me several times.