The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 90mm f2.8 Macro and the Sony 85mm F2.8 SAM for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Tamron 90mm f2.8 Macro is the longer of the two lenses at 97mm. The Sony 85mm F2.8 SAM with a length of 52mm is 45mm shorter. Besides being longer, the Tamron 90mm f2.8 Macro also has a larger diameter of 72mm compared to Sony 85mm F2.8 SAM's 70mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Sony 85mm F2.8 SAM weighs 175g, 56% (230g) lighter than the Tamron 90mm f2.8 Macro's weight of 405g.
Both Tamron 90mm f2.8 Macro and Sony 85mm F2.8 SAM has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A99 II, Sony A68 and Sony A77 II.
Tamron 90mm f2.8 Macro is also available in Canon EF , Nikon F (FX) and Pentax KAF mounts.
Tamron 90mm f2.8 Macro is a prime lens with fixed focal lenght of 90mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 135mm.
Sony 85mm F2.8 SAM is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 127.5mm.