Canon Extender EF 2x III flatbed It's fancy

It's fancy

Also: a large padded laptop compartment

Extends to approximately 5 feet

but if you're looking for a 4x5 camera that you can pack along in a reasonably-sized camera bag

Canon Extender EF 2x III flatbed It's fancyCanon Extender EF 2x III teleconverter, in excellent cosmetic condition. Doubles the effective focal length of the lens mounted to it. Since the teleconverter extends into the back of the lens, not all lenses may be mounted: this works with select Canon L series telephoto lenses only. Please confirm compatibility between your intended lens and this teleconverter. Clean glass and excellent function. Includes front and rear caps.