The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron AF 28-80mm f3.5-5.6 and the Pentax FA 43mm F1.9 L for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Tamron AF 28-80mm f3.5-5.6 is the longer of the two lenses at 70mm. The Pentax FA 43mm F1.9 L with a length of 27mm, is 43mm shorter. Besides being longer, the Tamron AF 28-80mm f3.5-5.6 also has a larger diameter of 72mm compared to the Pentax FA 43mm F1.9 L's 64mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Pentax FA 43mm F1.9 L weighs 155g, 34% (82g) lighter than the Tamron AF 28-80mm f3.5-5.6's weight of 237g.
Filter Threads
The Tamron AF 28-80mm f3.5-5.6 has a filter size of 58mm whereas the Pentax FA 43mm F1.9 L has a 49mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 58mm filters that we recommend you to consider for the Tamron AF 28-80mm f3.5-5.6:
And these are the 49mm filters that we recommend for the Pentax FA 43mm F1.9 L:
Lens Mounts
Both the Tamron AF 28-80mm f3.5-5.6 and the Pentax FA 43mm F1.9 L has the same Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax K-3 III Mono, Pentax KF and Pentax K-3 III.
Tamron AF 28-80mm f3.5-5.6 is also available in the Canon EF , Nikon F (FX) and Sony Alpha mounts.
Focal Range
Tamron AF 28-80mm f3.5-5.6 has a focal range of 28-80mm and
2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
42 - 120mm.
On the other hand, the Pentax FA 43mm F1.9 L is a prime lens with fixed focal lenght of 43mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 64.5mm.
