Tamron 272E SP 90mm f/2.8 Macro 1:1 Di Lens for Canon

The Tamron 272E 90mm f/2.8 Macro 1:1 Di Lens for Canon provides outstanding image quality whether the medium in use is silver halide (film) or a digital image sensor, since it features Tamron's "Di" optical system designed to meet the performance characteristics of digital cameras as well as film cameras. 

One major difference between digital cameras and film cameras is how internal reflections in mirror boxes may occur and to what extent. These internal reflections can cause unwanted flare or ghosting on the final image. In a film camera, internal reflections can be caused inside the mirror box of the camera or from light reflecting off the film surface. In a digital camera, stronger reflections can occur from light bouncing off the sensor, since CCD and CMOS sensors are almost mirror-like on their surface, making the problem more noticeable. The SP AF90mm F/2.8 Di lens features an improved coating technology that reduces to the absolute minimum the reflections that are likely to cause this issue. 

The SP AF90mm lens offers a medium telephoto focal length making it particularly useful as a portrait/macro lens when used with a full-size sensor or film camera. When used on a digital SLR camera (with an APS-C sized image sensor), the lens provides an angle of view equivalent to that of 140mm (35mm-equivalent), so it can be used conveniently as a telephoto macro lens for digital photography. 

The SP AF90mm is a 1:1 life-size macro lens for which outstanding optical performance is required, yet it uses engineering plastic materials for its barrel parts. As a result, the lens is the most lightweight medium telephoto lens among 1:1 life-size macro lenses in the 90mm range.

The lens features a mechanism to allow speedy AF/MF switchover in a single action. The rubber pattern on the intentionally wide focus control ring ensures a better grip, making use comfortable since macro lenses are frequently used in the manual focusing mode.