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 Lensbaby Sol 45 DSLR 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. Lensbaby Sol 45 DSLR weighs 144g, 90% (1406g) lighter than the Hartblei 40mm F4 IF TS's weight of 1550g.
Below you can find the dimension and weight table of the Perspective Control Prime Lenses in Pentax KAF Mount for size comparison purposes.
PC Lenses in Pentax KAF Mount for Size Comparison
Lens Mounts
Both the Hartblei 40mm F4 IF TS and the Lensbaby Sol 45 DSLR 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.
Lensbaby Sol 45 DSLR is also available in Canon EF , Fujifilm X, Nikon F (FX) and Sony Alpha mounts.
Focal Range
Hartblei 40mm F4 IF TS is a prime lens with fixed focal lenght of 40mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
60mm.
On the other hand, the Lensbaby Sol 45 DSLR is a prime lens with fixed focal lenght of 45mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 67.5mm.