Tokina has today announced its new SZ 2x Extender (TA-020), a T-mount 2x teleconverter for the Tokina SZX Super Tele 400mm f/8 Reflex MF lens released in July 2020. The SZ 2x Extender sits in between the lens and the mount adapter for your camera system – Canon EF, Fujifilm X, Micro 4/3, Nikon F, Nikon Z, or Sony E – and while it’s being marketed specifically with Tokina’s 400mm f/8 – they’ve even launched a new kit bundle that includes the two together – it should hypothetically work with just about any T-mount lens.
The Tokina SZ 2x Extender essentially turns your 400mm f/8 Reflex MF lens into an 800mm lens, but at the cost of aperture. You’ll lose two stops of light – as you do with all 2x teleconverters for any camera system. So, instead of metering f/8, it’ll now meter f/16. 2x teleconverters often play hell with autofocus systems that can’t meter lenses with a maximum aperture this small, but as it’s a manual focus lens, that’s not really much of an issue.