Yes, checkout canons website, or any photo site to buy a multitude of external flashes.
Yes, search for "Canon 30D Lens."
Yep!
The 430EX external flash seems like it would be the best candidate for the external flash for the Canon digital camera.
No, but an external flash with a flash button can be used while filming.
Yes, you can. It has a Hot Shoe Mount.
Yes, the Canon 600D can sync with an external flash, but it depends on the flash's capabilities and the settings used. The camera has a standard hot shoe that allows for the connection of compatible external flashes. However, for high-speed sync (HSS) to work, both the camera and the external flash must support this feature. Make sure to check the flash specifications to ensure compatibility.
Some of the best external flash options for a Canon Rebel XSi are the Canon Speedlite 430EX III-RT, Yongnuo YN560 IV, and Neewer NW-670. These flashes offer good performance and compatibility with the camera.
The Insignia TTL external flash for Canon cameras features automatic TTL metering, manual control options, and a guide number of 42. It is compatible with Canon EOS cameras and offers versatile lighting options for photography.
Some of the best external flash options compatible with the Canon Rebel T100 are the Canon Speedlite 430EX III-RT, Yongnuo YN560 IV, and Neewer NW-670. These flashes offer good performance and compatibility with the camera.
Canon replaced the 20D with the 30D that had more mexapixels and newer features. In fact, the 30D was replaced by the 40D, which was then replaced by the current (Jan. 2009) 50D camera body.
Absolutely. The 430EX was designed to be a cheaper speedlight option for Canon SLR users. It was especially designed to work with the 5D which doesn't have a built in flash. If you buy a 430EX it'll interact with your 30D, 350D or similar EOS SLR to help with white balance and focusing as well as giving you more professional looking flash photos. The flashgun will read the zoom length of your lens, how far it's been zoomed and other info from the camera and automatically adjust it's power and throw to provide the right flash angle and strength for each photo.
A recommended flash for the Canon T3i is the Canon 430EX II. This flash is about $270. However, honestly, any Canon flash will work well with the camera.