No need get the original one. Cause all of them looks the same you can't tell the difference at all. I bought my omnibounce from MITMIVEC RM50+ for a replica China made version. Used for few months and it doesn't turn brown or whatever. Maybe not enough UV/sunlight exposure. Haha! But it works effectively. So no need to waste the additional RM30 for a piece of plastic.
Yeah, flash does have a steep learning curve. I struggled also when I got my 430EX. Let me help you with this: Go to
http://planetneil.com/tangents/ and learn up the articles regarding controlling flash and balancing it with ambient light. It'll give you a rough idea on how to use flash.
Take note that, all the picture modes including Av and Tv utilize the external flash as fill-in mode only. In other words, they will work the same as if there is not flash attached, but now the flash works to fill in your subject only (good for daylight). In low light situations, your shutter speed will still drop and cause motion blur. The 400D has a custom function to set the Av mode to fixed shutter speed of 1/200 (sync speed). Usable but defeats the purpose of complete control.
Basically, we use the external flash in Manual (M) or P mode. This is where you can play around with shutter speeds, aperture and ISO, etc and the TTL flash will compensate. This is where it will act as the main source of light. Good for bouncing and stuffs. This is how I used mine:
1. Examine the subject and determine an appropriate aperture so that everything will be in focus and sharp. Identify ISO too.
2. Set to Av with the desired aperture and meter a few spots to check the shutter speed readings. If too low, you calculate the next best shutter speed where you can prevent camera shake (this is better if you got IS).
3. Set to M and dial in your A, T, ISO, etc.
4. Set camera metering to Average and set flash to Average TTL (from within 400D custom function)
5. Set external flash compensation to +1/3 to +2/3. (depending on your preference)
6. Identify for best bounce angle. Look at walls, or use diffusers, etc (depending on your preference)
7. Shoot away.
8. You can change any of the settings on the fly and the flash will always compensate. Watch the meter on the viewfinder closely to see how far you have deviate from standard exposure. Use it as a guide.
Mr. Neil (from his website) uses the following to control flash with ambient.
T = Use to expose the ambient and background (determines motion too)
A = Use to expose the subject and depth of field (sometimes flash is too hot on subjects, reducing aperture will expose it properly)
ISO = Use to expose the ambient and background (determines noise too)
FEV = Flash compensation
Flash = Use to artificially 'freeze' the subject
I know this sounds like a bunch of bull. I can't understand it either at first. But as I got around with experience, it kinda works together now.
Hope it helps.
P/S: Don't worry about noise or shy to go ISO1600. You can do noise reduction later. A good program to try is Noise Ninja. PM me for details. Others are welcome also.