This Tamron telescopic lens is made for the photographer working with images of distant objects. Mastering mid-to-long range photography with a minimum focal distance of 9 m (30 feet), this lens is most suited for outdoor images, but maintains broader utility as well. The Tamron 400 mm lens features a two-group, four-element construction in a reasonable 642-g (1.4-lb) frame. The Japanese-designed T mount lens makes for reliable alignment on top of the camera, with a 42 mm x 0.75 threaded connection, ensuring that the lens markings align with camera direction. The Tamron 400 mm lens features an open f/6.9 focal ratio down to a minimum f/32 for capturing all the details of longer-range images. The Tamron telescopic lens comes with a 62 mm filter ability when required by ambient lighting conditions. This Tamron T mount lens makes capturing high-precision, medium- to large-format images reliable and enjoyable. The Tamron 400 mm lens makes a good addition to a lens collection where the photographer is looking to enhance his or her distance capabilities with a telescopic lens.