(Note that this price may be a limited time offer.) Right now you can own all three Tamron prime lenses for less than $900 total. Turning this inside out, lenses that were designed specifically for APS-C sensor cameras cannot produce a full corner-to-corner image when used on a full-frame camera because the cone of light that they pass is too small to cover a sensor that measures the full 36 x 24mm. Consequently, the 20mm becomes the equivalent of a 30mm, the 24mm jumps to 36mm and the 35mm equals a 52mm focal length. However, when used on a Sony camera that has a sensor that is APS-C in size (e.g., a Sony Alpha a6500) the Crop Factor is 1.5. Shot with Tamron 20mm f/2.8 Di III OSD lens on a Sony mirrorless full-frame camera body.Ĭrop factors do not come into play when using any of Tamron’s six mirrorless-optimized lenses on full-frame cameras. This image, also displayed at the top of this story, ©Alexander Ahrenhold. Tamron has elected not to label these three prime lenses as Macro, but by the definitions used by some other manufacturers, they could be labeled as such. As you can easily imagine, when you enlarge that image to normal viewing size, the object becomes ginormous and richly detailed.Īlthough true “Macro” photography begins at 1:1 (also called “life size”) historically many lenses that produce a 1:2 ratio have been labeled “Macro.” Many so-called “Macro Zooms” have a reproduction ratio of 1:4 or lower. Simply explained, if you photograph a one-inch long subject at the closest focusing distance, it will be recorded as an image that measures one-half inch long on the sensor. Since the filter size of all six of Tamron’s mirrorless lenses is 67mm, you don’t need to buy polarizers or expensive ND filters in two or three different size-plus it’s much more convenient when changing lenses because all lens caps are interchangeable.Īll three of Tamron’s prime lenses feature a reproduction ratio of 1:2. That may just seem like a small detail, but think about it. All three are compact and in fact all share the same 67mm filter size, same as the three primes. The three Tamron zoom lenses that are specifically designed for full-frame Sony mirrorless cameras are the Tamron 70-180mm f/2.8 Di III VXD, Tamron 28-75mm f/2.8 Di III RXD and Tamron 17-28mm f/2.8 Di III RXD. All are fully compatible with Sony’s baked-in camera features including Fast Hybrid AF, Eye AF and in-camera lens corrections (shading, chromatic aberration, distortion). These lenses were designed specifically for full-frame mirrorless cameras and are available in the Sony E mount. All are f/2.8 and measure just 2.5-inches tall. The three prime lenses standout because they are uniquely small, focus very close (down to an amazing 1:2 reproduction ratio) and-aside from focal length-share most physical specifications. Three of these lenses are zooms, and three are prime (single focal length) lenses. All six feature large f/2.8 apertures and all are so compact that they share the same 67mm filter size. Tamron, who will mark their 70th anniversary in November of 2020, offers six compact, high-performance lenses that are specifically designed for Sony’s full-frame mirrorless cameras. And all focus as close as just a few inches. All three are fast, compact and designed for full-frame Sony mirrorless cameras. The Tamron 20mm f/2.8, 24mm f/2.8 and 35mm f/2.8 prime lenses have a lot in common.
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