When you open a video in the Photos app and choose to send it via email, does the video get compressed, or is it sent using the same resolution it was shot in?
I'm mainly wondering about the iPhone 4.
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You are correct. The video will be compressed to a smaller size before sending out.
EDIT: If you want to try to send uncompressed video, you can try the trick from this guy, http://www.quora.com/How-can-I-share-an-uncompressed-video-from-my-iPhone
In the Camera Roll or Photos app, press and hold on the photo. A menu should pop up with Copy as an option. If you want multiple photos, you can hit the Share button the toolbar and select all the photos you want and then hit Copy. Either way, you'll end up with the full-quality photo in your clipboard, which you can then paste into an email.