Canon Extender EF 2x III brand_Lowel The Nikon D3100 is a

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

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

the glass is clean and imaging is excellent

Good optics

Canon Extender EF 2x III brand_Lowel The Nikon D3100 is aCanon 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.