1. Megapixels and Resolution

400D (Rebel Xti) is 10 megapixels while 450D is 12 megapixels. Which means 450 D is able to capture higher resolution images. This is an advantage if you want to print large pictures.

2. Storage

450D (Rebel Xsi) stores the images in SD card but 400D uses CF (Compact flash) card. Actually it is not an advantage in my opinion. Ok, SD cards are smaller than CF cards but CF cards can reach higher transfer speeds.

3. Live View

Canon made an improvement in 450D and placed a Live View system in it. So you don’t have to use the viewfinder all the time. This ability of 450D may come in handy in some conditions, night and low light shots for example. Unfortunately 400D doesn’t have this feature.

4. Kit Lens

Basically both kits come with the standard 18-55mm lens of Canon but with a difference. Producers decided to integrate an image stabilizer system in standard 18-55mm lens that comes with 450D. This system may be helpful for avoiding camera shakes. Again 400D doesn’t have this feature.

5. Conclusion

There are no major differences. Having Live View and Image Stabilizer can be useful but still you can live without them.If you have a limited budget don’t beat up yourself. Remember there are some people out there who have a strong passion for photography and they are using 30 year old manual film cameras because they can not afford to buy a new digital SLR. So i wish you are not in such condition. Please do not forget; photography is not about having the best camera, it is about passion, creativity and effort.si,