The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Fujifilm Fujinon MKX 50-135mm T2.9 and the Fujifilm 50-140mm F2.8 R OI 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. Fujifilm Fujinon MKX 50-135mm T2.9 is the longer of the two lenses at 207mm. The Fujifilm 50-140mm F2.8 R OI with a length of 176mm, is 31mm shorter. Besides being longer, the Fujifilm Fujinon MKX 50-135mm T2.9 also has a larger diameter of 87mm compared to the Fujifilm 50-140mm F2.8 R OI's 83mm 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. Fujifilm 50-140mm F2.8 R OI weighs 995g, 7% (85g) lighter than the Fujifilm Fujinon MKX 50-135mm T2.9's weight of 1080g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Fujifilm X Mount for size comparison purposes.
Telephoto Lenses in Fujifilm X Mount for Size Comparison
Filter Threads
The Fujifilm Fujinon MKX 50-135mm T2.9 has a filter size of 82mm whereas the Fujifilm 50-140mm F2.8 R OI has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 82mm filters that we recommend you to consider for the Fujifilm Fujinon MKX 50-135mm T2.9:
And these are the 72mm filters that we recommend for the Fujifilm 50-140mm F2.8 R OI:
Lens Mounts
Both the Fujifilm Fujinon MKX 50-135mm T2.9 and the Fujifilm 50-140mm F2.8 R OI has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-S20, Fujifilm X-T5 and Fujifilm X-H2.
Focal Range
Fujifilm Fujinon MKX 50-135mm T2.9 has a focal range of 50-135mm and
2.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
75-202.5mm when used on a 35mm FF format camera.
On the other hand, the Fujifilm 50-140mm F2.8 R OI has a focal range of 50-140mm and 2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 75-210mm when used on a APS-C / DX format camera.