FujiFilm X-Pro2 - Manual (Page 10)

18 Your X-Pro2 System The Basics (2):Things You Should Know About Your Lenses 19
Decoding XF18–135mmF3.5–5.6 R LM OIS WR
This tip is of the “what you always wanted to know but
never dared to ask” variety:
■ XF: “X” means X-mount or X-series; “F” means Fine, for
Fuji’s premium line of lenses. There’s also the smaller,
more affordable XC line (“C” stands for Compact or
Casual).
■ 18–135mm: This is the focal length range of the zoom
lens. To translate the numbers to their full-frame equiv-
alents, you have to multiply them by the APS-C crop
factor [08] of 1.5. Hence, the field-of-view (FOV) of an
18–135mm zoom on your X-Pro2 is identical to the FOV of
a 27–202mm zoom lens on a full-frame camera.
■ F3.5–5.6: This range describes the maximum aperture
opening at the low and high end of the focal-length
range. In this case, the lens offers a maximum aperture
of f/3.5 at 18mm and f/5.6 at 135mm.
■ R: This stands for Ring and simply means that the lens
features an aperture ring. This is a standard feature of all
Fujinon XF lenses, with the exception of the XF27mmF2.8
pancake lens. XC zooms don’t offer an aperture ring,
either. With those lenses, the aperture setting is con-
trolled with the rear command dial (thumb dial) when
you are using exposure modes
A or M .
■ LM: This stands for Linear Motor, which ensures quick
and silent autofocus operation.
■ OIS: This is the Optical Image Stabilizer [09]. This feature
allows you to perform handheld shots at up to five stops
slower of a shutter speed than you would usually need
to eliminate camera shake. For example, in situations
that would normally require a shutter speed of 1/80s
to ensure a clear image, you could shoot with 1/4s and
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still get usable results. It’s important to remember that
motion blur often plays a role at slower shutter speeds
since many subjects tend to move. Obviously the OIS
cannot reduce motion blur [10]—only blurring that
occurs due to camera shake (i.e., the shaky hands of the
photographer).
■ WR denotes weather resistant lenses. These lenses are a
great fit for your weather resistant X-Pro2.
Fig. 13: The XF35mmF2 R WR is the new standard prime lens for
your X-Pro2 (and its predecessor, the X-Pro1). It’s weather resistant,
and its lean design doesn’t obscure the optical viewfinder.
The optical image stabilizer (OIS) has its quirks!
With the exception of the XF16–55mmF2.8 R LM WR zoom,
all XF and XC zoom lenses feature built-in optical image
stabilization (OIS). Switch on the OIS to prevent camera
shake and blurry images in situations that require you to
take handheld shots at a slower-than-usual shutter speed.
XF lenses offer a dedicated OIS on/off switch on the lens
barrel. The OIS in XC lenses is controlled through a camera
menu.
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