The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron AF 18-270mm f3.5-6.3 II VC LD and the Panasonic 45-200mm F4-5.6 OIS 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. Tamron AF 18-270mm f3.5-6.3 II VC LD is the longer of the two lenses at 101mm. The Panasonic 45-200mm F4-5.6 OIS with a length of 100mm, is 1mm shorter. Besides being longer, the Tamron AF 18-270mm f3.5-6.3 II VC LD also has a larger diameter of 80mm compared to the Panasonic 45-200mm F4-5.6 OIS's 70mm 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 45-200mm F4-5.6 OIS weighs 380g, 32% (180g) lighter than the Tamron AF 18-270mm f3.5-6.3 II VC LD's weight of 560g.
Filter Threads
The Tamron AF 18-270mm f3.5-6.3 II VC LD has a filter size of 72mm whereas the Panasonic 45-200mm F4-5.6 OIS has a 52mm 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 Tamron AF 18-270mm f3.5-6.3 II VC LD:
And these are the 52mm filters that we recommend for the Panasonic 45-200mm F4-5.6 OIS:
Lens Mounts
The Tamron AF 18-270mm f3.5-6.3 II VC LD has the Nikon F (DX) lens mount whereas the Panasonic 45-200mm F4-5.6 OIS has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Tamron AF 18-270mm f3.5-6.3 II VC LD is also available in the Canon EF mount.
Focal Range
Tamron AF 18-270mm f3.5-6.3 II VC LD has a focal range of 18-270mm and
15.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-405mm when used on a APS-C / DX format camera.
On the other hand, the Panasonic 45-200mm F4-5.6 OIS has a focal range of 45-200mm and 4.4X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 90-400mm when used on a FourThirds format camera.