The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax 16-45mm F4 ED AL and the Pentax D FA 645 55mm F2.8 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. Pentax 16-45mm F4 ED AL is the longer of the two lenses at 92mm. The Pentax D FA 645 55mm F2.8 with a length of 68mm, is 24mm shorter. On the other hand, the Pentax D FA 645 55mm F2.8 has a larger diameter of 81mm compared to the Pentax 16-45mm F4 ED AL's 72mm 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 16-45mm F4 ED AL weighs 356g, which means it is 60g (14%) lighter than the Pentax D FA 645 55mm F2.8 which has a weight of 416g.
Filter Threads
Both the Pentax 16-45mm F4 ED AL and the Pentax D FA 645 55mm F2.8 have the same Filter thread size of 67mm.
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Pentax 16-45mm F4 ED AL and the Pentax D FA 645 55mm F2.8 has the same Pentax 645AF2 lens mount. Some of the latest released cameras that are compatible with the Pentax 645AF2 lenses are , and .
Focal Range
Pentax 16-45mm F4 ED AL has a focal range of 16-45mm and
2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
24-67.5mm when used on a APS-C / DX format camera.
On the other hand, the Pentax D FA 645 55mm F2.8 is a prime lens with fixed focal lenght of 55mm.
