Canon Extender EF 2x III brand_Lowel This is a nice ultrawide

This is a nice ultrawide lens with a fast f4 constant aperture and an image stabilizer for steadier shooting- yeah

and the option for full manual control

it's accurate

The Nikon D3100 is a compact DSLR camera that shoots 24mp stills or 1080p video at up to 30fps

the glass is clean and imaging is excellent

Canon Extender EF 2x III brand_Lowel This is a nice ultrawideCanon 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.