The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 18-200mm F3.5-6.3 DC OS HSM C and the Panasonic Leica 35-100mm f2.8 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. Panasonic Leica 35-100mm f2.8 is the longer of the two lenses at 100mm. The Sigma 18-200mm F3.5-6.3 DC OS HSM C with a length of 86mm, is 14mm shorter. On the other hand, the Sigma 18-200mm F3.5-6.3 DC OS HSM C has a larger diameter of 71mm compared to the Panasonic Leica 35-100mm f2.8'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 Leica 35-100mm f2.8 weighs 360g, 16% (70g) lighter than the Sigma 18-200mm F3.5-6.3 DC OS HSM C's weight of 430g.
Filter Threads
The Sigma 18-200mm F3.5-6.3 DC OS HSM C has a filter size of 62mm whereas the Panasonic Leica 35-100mm f2.8 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 62mm filters that we recommend you to consider for the Sigma 18-200mm F3.5-6.3 DC OS HSM C:
And these are the 58mm filters that we recommend for the Panasonic Leica 35-100mm f2.8:
Lens Mounts
The Sigma 18-200mm F3.5-6.3 DC OS HSM C has the Sigma SA lens mount whereas the Panasonic Leica 35-100mm f2.8 has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are Sigma SD1 Merrill, Sigma SD1 and for the Sigma SA Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Sigma 18-200mm F3.5-6.3 DC OS HSM C is also available in the Canon EF , Nikon F (DX), Pentax KAF3 and Sony Alpha mounts.
Focal Range
Sigma 18-200mm F3.5-6.3 DC OS HSM C has a focal range of 18-200mm and
11.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-300mm when used on a APS-C / DX format camera.
On the other hand, the Panasonic Leica 35-100mm f2.8 has a focal range of 35-100mm and 2.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 70-200mm when used on a FourThirds format camera.
