Originally Posted by AgX
Teleconverters will narrow the angle of view, thus making exposure more susceptible to camera shake (tilt).
Extention rings will even broaden the angle of view a little bit.
Finally someone clearly spelled it out. There are two different products with two different goals.
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.