The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Hartblei 40mm F4 IF TS and the Pentax 40mm F2.8 XS Lens 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. Pentax 40mm F2.8 XS Lens weighs 45g, 97% (1505g) lighter than the Hartblei 40mm F4 IF TS's weight of 1550g.
Lens Mounts
Both the Hartblei 40mm F4 IF TS and the Pentax 40mm F2.8 XS Lens 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 Monochrome, Pentax KF and Pentax K-3 III.
Hartblei 40mm F4 IF TS is also available in Canon EF , Sony Alpha and Nikon F (FX) mounts.
Focal Range
Both lenses have the same focal range of
40mm but while Hartblei 40mm F4 IF TS has the fastest aperture of
F4.0, the Pentax 40mm F2.8 XS Lens's widest aperture value is
F2.8.