The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax DA645 28-45mm F4.5ED and the Pentax D FA 645 25mm F4 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 DA645 28-45mm F4.5ED is the longer of the two lenses at 152mm. The Pentax D FA 645 25mm F4 with a length of 140mm, is 12mm shorter. Besides being longer, the Pentax DA645 28-45mm F4.5ED also has a larger diameter of 99mm compared to the Pentax D FA 645 25mm F4's 90mm 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 D FA 645 25mm F4 weighs 1070g, 27% (400g) lighter than the Pentax DA645 28-45mm F4.5ED's weight of 1470g.
Filter Threads
The Pentax DA645 28-45mm F4.5ED has a filter size of 82mm whereas the Pentax D FA 645 25mm F4 has a 41mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 82mm filters that we recommend you to consider for the Pentax DA645 28-45mm F4.5ED:
And these are the 41mm filters that we recommend for the Pentax D FA 645 25mm F4:
Lens Mounts
Both the Pentax DA645 28-45mm F4.5ED and the Pentax D FA 645 25mm F4 has the same Pentax 645AF2 lens mount. Some of the latest released cameras that are compatible with the Pentax 645AF2 lenses are Pentax 645Z, Pentax 645D and .
Focal Range
Pentax DA645 28-45mm F4.5ED is a prime lens with fixed focal lenght of 28-45mm.
On the other hand, the Pentax D FA 645 25mm F4 is a prime lens with fixed focal lenght of 25mm.
