The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 18-300 F3.5-6.3 DC OS HSM and the Panasonic 14-140mm F3.5-5.6 O.I.S 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. Sigma 18-300 F3.5-6.3 DC OS HSM is the longer of the two lenses at 102mm. The Panasonic 14-140mm F3.5-5.6 O.I.S with a length of 75mm, is 27mm shorter. Besides being longer, the Sigma 18-300 F3.5-6.3 DC OS HSM also has a larger diameter of 79mm compared to the Panasonic 14-140mm F3.5-5.6 O.I.S's 67mm 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. Panasonic 14-140mm F3.5-5.6 O.I.S weighs 265g, 54% (320g) lighter than the Sigma 18-300 F3.5-6.3 DC OS HSM's weight of 585g.
Filter Threads
The Sigma 18-300 F3.5-6.3 DC OS HSM has a filter size of 72mm whereas the Panasonic 14-140mm F3.5-5.6 O.I.S has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Sigma 18-300 F3.5-6.3 DC OS HSM:
And these are the 58mm filters that we recommend for the Panasonic 14-140mm F3.5-5.6 O.I.S:
Lens Mounts
The Sigma 18-300 F3.5-6.3 DC OS HSM has the Pentax KAF3 lens mount whereas the Panasonic 14-140mm F3.5-5.6 O.I.S has the Micro Four Thirds 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 KAF3 Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Sigma 18-300 F3.5-6.3 DC OS HSM is also available in the Canon EF , Nikon F (DX), Sigma SA and Sony Alpha mounts.
Focal Range
Sigma 18-300 F3.5-6.3 DC OS HSM has a focal range of 18-300mm and
16.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-450mm when used on a APS-C / DX format camera.
On the other hand, the Panasonic 14-140mm F3.5-5.6 O.I.S has a focal range of 14-140mm and 10.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 28-280mm when used on a FourThirds format camera.
