| From: "Alex" <[EMAIL PROTECTED]>
| Subject: EOS Extending the RS60-E3
|
| Hey all, this is a bit of a follow-up to a previous thread, that discussed
| some ideas for extending the reach of the RS60E3 remote switch. I stopped
| by my local Radio Shack and they didn't seem to have any 2.5mm (submini)
| extension cables, but they did have 3.5mm. So, I bought a 3.5mm extension
| cable and a pair of adapters (2.5 - 3.5 and back again).
|
| However, when plugged into the camera, the camera behaves as if the shutter
| is being held down half-way; i.e., the autofocus is constantly being
| engaged, the metering information shows on the top LCD, etc. Anyone have
| any ideas why it's doing this, and what I can do to fix it? Is it just a
| problem of having too many things on the wire between the camera and the
| switch? BTW, all of the parts are mono--maybe everything needs to be
| stereo, so there's multiple wires inside the cable? I don't know. Any help
| would be appreciated. :)
The RS60ES has, as you know, a 2.5 mm plug (which fits, of course, a 2.5
mm jack on the camera, such as my Rebel G). This plug is "stereo", meaning
it supports 3 electrical connections. The traditonal names for the exposed
parts of the plug are "tip," "ring," and "sleeve."
The RS60ES incorporates two switches: the pre-exposure "halfway" switch,
and the exposure "shutter release" switch. Both switches are normally open
and have one contact connected to the sleeve. The remaining contact on the
halfway switch goes to the sleeve, and that of the shutter release switch goes to
the tip.
When you insert a mono plug into the camera's tip-ring-sleeve jack, it shorts the
ring and the sleeve together; in this application, it looks to the camera like the
"halfway" switch has been closed.
So you really do need to extend the RS60-E3 with 2.5 mm "stereo" connectors
and three-conductor cable.
Radio shack may or may not have a pre-made cable of this type in their
catalog. They probably have the necessary components however.
DGW
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