The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Lensbaby Burnside 35 and the Sigma 30mm F1.4 EX DC HSM for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Lensbaby Burnside 35 is the longer of the two lenses at 70mm. The Sigma 30mm F1.4 EX DC HSM with a length of 59mm is 11mm shorter. On the other hand, the Sigma 30mm F1.4 EX DC HSM has a larger diameter of 77mm compared to Lensbaby Burnside 35's 70mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Lensbaby Burnside 35 weighs 374g, which means it is 56g (13%) lighter than the Sigma 30mm F1.4 EX DC HSM which has a weight of 430g.
Below you can find the dimension and weight table of the 'Standard Prime Lenses in Pentax KAF Mount for size comparison purposes.
Standard Prime Lenses in Pentax KAF Mount for Size Comparison
Both Lensbaby Burnside 35 and Sigma 30mm F1.4 EX DC HSM has the same Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax KF, Pentax K-3 III and Pentax K-1 II.
Lensbaby Burnside 35 is also available in Canon EF , Fujifilm X, Micro Four Thirds, Nikon F (FX), Samsung NX, Sony Alpha and Sony E mounts.
Sigma 30mm F1.4 EX DC HSM is also available in Canon EF-S , Nikon F (DX), Four Thirds, Sony Alpha and Sigma SA mounts.
Lensbaby Burnside 35 is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 52.5mm.
Sigma 30mm F1.4 EX DC HSM is a prime lens with fixed focal lenght of 30mm which has a 35mm equivalent focal range of 52.5mm when used on a APS-C / DX format camera.