Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Tamron 14-150mm f3.5-5.8 III is the longer of the two lenses at 80mm. The Panasonic 14-140mm F3.5-5.6 O.I.S with a length of 75mm is 5mm shorter. On the other hand, the Panasonic 14-140mm F3.5-5.6 O.I.S has a larger diameter of 67mm compared to Tamron 14-150mm f3.5-5.8 III's 64mm 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. Panasonic 14-140mm F3.5-5.6 O.I.S weighs 265g, 7% (20g) lighter than the Tamron 14-150mm f3.5-5.8 III's weight of 285g.
Below you can find the dimension and weight table of the 'SuperZoom Lenses in Micro Four Thirds Mount for size comparison purposes.
SuperZoom Lenses in Micro Four Thirds Mount for Size Comparison
Both Tamron 14-150mm f3.5-5.8 III and Panasonic 14-140mm F3.5-5.6 O.I.S has the same Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with the Micro Four Thirds lenses are Panasonic GH6, OM System OM-1 and Panasonic GH5 II.
Tamron 14-150mm f3.5-5.8 III has a focal range of 14-150mm and 10.7X zoom ratio which has a 35mm equivalent focal range of 28-300mm when used on a FourThirds format camera. Panasonic 14-140mm F3.5-5.6 O.I.S has a focal range of 14-140mm and 10.0X zoom ratio which has a 35mm equivalent focal range of 28-280mm when used on a FourThirds format camera.