bottom of a 40d...

editing post for removal.

Pic isn't coming up, but I would assume it's the port for the WFT-E3 wireless grip that you're asking about

It's for the WFT-E3A grip, which adds wi-fi connectivity but doesn't work as a normal battery grip (the battery inside it will not power the camera at all, but only the grip).

That's the whole point of the connector the OP asked about.
Data transfer and camera control. Just like you can control the camera's shutter through the USB port.

tomdlgns wrote in post #6225133
why not build this into the battery grip?

Here's a link to the WiFi grip:
http://www.adorama.com …archinfo=WFT-E3&item_no=1

As you can see, there isn't a post that goes into the cameras battery compartment. The standard battery stays in the camera, and the grip has its own battery to power its features. It's for a different purpose than the standard BG-E2N grip.

You can also see that this grip costs about $800.00

Here's a post from someone who bought one of these grips:
https://photography-on-the.net/forum/showthre​ad.php?t=380945

Pretty cool device if you have a purpose for it.

Oh and it actually has an AF-ON button.

tomdlgns wrote in post #6225125
ok, i just put the url of the image.

Here is your picture...

http://imaging-resource.com/PRODS/E40​D/ZPREBOTTOM.JPG

EDIT: Image converted to a link. If the image is NOT yours you may NOT embed it.

I saw it without a problem, in the last two posts too

Please refer to the forum rules regarding the posting of images.

https://photography-on-the.net/forum/showthre​ad.php?t=51022

In short you may NOT embed images that are not yours.

Thanks.

tomdlgns wrote in post #6226360
sorry about that.

just for the record, that is a dumb rule.

No problem.

I will not discuss the rule here other than to say that there is a very good reason for it. If you want to discuss it use the Forum Talk section.

tomdlgns wrote in post #6226438
is there a thread with this topic already started?

Not off the top of my head. You might search though, just to make sure.

In2Photos wrote in post #6226353
Please refer to the forum rules regarding the posting of images.

https://photography-on-the.net/forum/showthre​ad.php?t=51022

In short you may NOT embed images that are not yours.

Thanks.

I should have just posted the fixed link (without the 'img.' at front) instead of embedding the picture.
Thanks for changing my post.

snowrdr wrote in post #6227086
I should have just posted the fixed link (without the 'img.' at front) instead of embedding the picture.
Thanks for changing my post.

No problem Dave.

its a very cool, very expensive grip.I would love to have one but damn not for that cost