I don't know how long ago you asked this question, but the 540EZ is VERY old. It's pretty much obsolete now. Go for the 430EX or the 580EX. They're a decent price, and work very well. If you want more power out of it, the 580EX Mk II is your best bet. ;)
EF and EF-S lenses can be used on 400d. There is a lot of lenses out there.
You mean 40D? Then definitely Canon 40D!
Absolutely yes. Canon EOS 450D has the same mount as Canon EOS 400D, wich is EF and EF-S.
Yes, the Canon EOS 400D has both EF and EF-S lens mounts. Therefore, the TS-E 90mm WILL fit on the camera because it has an EF lens mount.
In Europe they are also called the 400D. I don't Know about Australia, but there is a big difference in price. If memory serves me well the Firmware is different and of Course the Rebel Badge.
I personally, like nikon d60 more than 400d
The Canon 400d is a Single-Lens Reflex digital camera, offering a resolution of up to 10.1 megapixels. It can also accommodate an add-on called a 400plus.
The Canon website is an excellent starting place to look for any Canon product. Websites such as ebay or amazon may also have used products available for purchase at a reduced cost.
The Canon EOS 400D Digital SLR camera comes equipped with a variety of features. The camera comes with autofocus, 10.1 megapixels, a 2.5 inch LCD screen, rechargeable battery, and integrated sensor cleaning system.
You can find the best prices for 400D Canon Cameras by using the price comparison feature on Let'sGoDigital's main website. Amazon and Walmart also offer competitive pricing.
There are many places where one can buy an EOS 400d online. One may purchase this camera from it's manufacturer "Canon" directly. One may also purchase these cameras online at eBay.
If your Canon EOS 400D won't turn on, first check the battery to ensure it is charged and properly inserted. Inspect the battery contacts for dirt or corrosion, which could prevent a good connection. Additionally, confirm that the power switch is functioning correctly and that there's no issue with the memory card or other accessories. If the camera still doesn't power on, it may require professional servicing.