If you have been drooling over the MPE65 and MT24EX, drool no more! LOL. Thanks to KJ Teng for the heads-up.
This may just be what you have been waiting for:
It's called DMF Supermacro, a reverse lens adapter with twin flash. Note: the camera body and lens are not included. There is only Canon version though. You will still need a lens. An 18-55 kit lens will work great here. With this DMF Supermacro reverse lens adapter, you will not only be able to use ETTL flash, but also to control the aperture setting. About USD 700 including EMS shipping to Malaysia.
There is a demo video but there's only Mandarin subtitle:
DMF SuperMacro TECH PART3 from frankwu on Vimeo.
DMF Supermacro site is here. It is in Mandarin but there is a "translate" button at the bottom right, at least in my Firefox browser.
DMF SuperMacro features:
Here is my attempt at the translation!
* transform any ordinary kit lens into high resolution super macro lens!
* equipped with macro twin flashes with adjustable angles!
* built in focusing light!
* achieve from 1/3 to 10X magnification depending on the zoom ranges and focal lengths of the lenses.
* no modification required on the lens(es).
* simply adjust the lens barrel to change the focal length in order to achieve different magnification!
* Patented, light weight and durable design. Made in Taiwan!
With a Canon 18-55mm kit lens, this is what you can get:
* at 52mm, 1:1 magnification
* at 38mm, 2:1 magnification
* at 28mm, 3:1 magnification
If you wish to calculate the magnification, the best way is to shoot an mm ruler as explained in the "How to calculate magnification" post.
Sample shots on Flickr.
There is a somewhat similar product from Novoflex - EOS-RETRO, Reverse Adapter (Euro 299) for Canon EOS (yes, Canon, again. Don't they know Canon already has an MPE65?). But as you can see, it doesn't come with the twin flash like the DMF Supermacro does.
Of course you also buy just a simple, no frill reverse lens adapter like the Opteka 58mm Reverse Macro Adapter for Canon EOS EF 18-55mm . It is a simple reverse lens adapter with no electrical contact, hence no ETTL, no aperture control via the camera.
It's cheap. The downsides are, you will have to manually adjust the flash power. That can be quite a pain at different magnification. Since you have to preset the aperture to probably F11, most macro photographers' favorite aperture setting, the view finder will be very dim. Not really a big problem if you don't mind attaching a focusing light to your macro rig.
How do you know which adapter is for your lens you want to reverse? Simple. If you have a Canon 18-55mm kit lens, you know the filter size is 58mm, then what you need is a 58mm Canon mount reverse lens adapter! So on and so forth. There are reverse lens adapters for most mounts: Nikon, Canon, Sony, Pentax etc.
Please also check out "All About Extension Tubes for Macro" to find out how you can go beyond 1:1 (1X) or simply just to test the water, get your feet wet in macro photography! It is really inexpensive. As low as 10 USD to get started!