In July 2018, Teng long released a full-frame Zoom Lens 28-75mm F2.8 Di III RXD, but for this Lens, the majority of consumers are mixed. 

     The likes side said: The Lens has excellent optical quality, full focus F2.8 large aperture to bring the superior blur effect and bright photo effect, about 5,000 price is also more approachable. 

      Critics say the Lens is dry and not oily, and that it uses a normal focusing motor, which makes it noisy for auto-focusing. But now, Teng long to remove the dregs save essence, continuous optimization, again set sail, plans to launch the second generation 28-75 mm F2.8 Lens this year. The second-generation 28-75mm F2.8 Lens remains the same size, but the optical system has been redesigned and optimized to meet the needs of higher-resolution, non-invertible cameras. The AF driver uses a new linear motor focusing mechanism, the VXD, the AF speed and accuracy are improved. The Wide Angle end is close to the focus distance 0.18 m, the peak magnification is 1:2.7, and the close-up ability is enhanced a little. 

    Yes, the linear motor is the core equipment of the 28-75mm F2.8 Lens of Tenglong II. It is also the core equipment of optimizing the focus of the lens and reducing the focus noise. 

     Kunshan has been improving the efficiency and productivity of complex manufacturing processes for more than a decade, its linear motor, linear module, linear slide, voice coil motor, voice coil module and other products have been widely trusted by customers at home and abroad. 

       The article was originally written by www.tmmotion.com in Kunshan, China. Please quote the source.