The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax 12-24mm F4.0 ED AL and the Tamron 10-24mm f3.5-4.5 II LD for their suitability to various photography scenarios:
Size and Weight Comparison
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. Tamron 10-24mm f3.5-4.5 II LD weighs 406g, 5% (24g) lighter than the Pentax 12-24mm F4.0 ED AL's weight of 430g.
Filter Threads
Both the Pentax 12-24mm F4.0 ED AL and the Tamron 10-24mm f3.5-4.5 II LD have the same Filter thread size of 77mm.
Below are links to the 77mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Pentax 12-24mm F4.0 ED AL has the Pentax KAF lens mount whereas the Tamron 10-24mm f3.5-4.5 II LD has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount and Sony A68, Sony A77 II and Sony A58 for the Sony Alpha Mount.
Tamron 10-24mm f3.5-4.5 II LD is also available in Canon EF , Nikon F (DX), Pentax KAF and Canon EF mounts.
Focal Range
Pentax 12-24mm F4.0 ED AL has a focal range of 12-24mm and
2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
18-36mm when used on a APS-C / DX format camera.
On the other hand, the Tamron 10-24mm f3.5-4.5 II LD has a focal range of 10-24mm and 2.4X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 15-36mm when used on a APS-C / DX format camera.
