Features of fixed focus lens
Simon X (jklove)
on
November 16, 2021
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Among the lenses compatible with Micro Four
Thirds, this time we will introduce a fixed
focus lens. First of all, I will explain
about the focal lens again.
Focal
length does not change
A fixed focal length lens has a constant
focal length. In other words, you cannot
zoom in and shoot like a zoom lens. To
change the distance to the subject, the
cameraman must actually move. However, by
shooting with a fixed focus lens, you will be
able to remember the distance to the subject
with your body, so you should be able to
acquire basic shooting skills.
The angle of view does
not change
The angle of view is the angle of view that
appears in a photograph. With a zoom lens,
the image is enlarged or reduced by zooming
(manipulating the focal length), but since a
fixed focus lens cannot zoom, the image is
not enlarged or reduced.
Good image quality and
bright
Compared to the structure of a zoom lens, the
structure of a fixed focus lens is very
simple. That amount, it is possible to
pursue the image quality and brightness,
reasonable while a high-performance lens is
equipped. Above all, the brightness and
bokeh are of a high standard. The brightness
of the lens is indicated by the "F value",
and the smaller the F value, the brighter the
lens and the greater the blur. It is not
uncommon for fixed focal length lenses to
have the highest class F1.8 or lower.
Many small and lightweight
models
Weight is a concern when carrying equipment
or shooting for a long time. Fixed focus
lenses are available in smaller and lighter
models than zoom lenses. Also, because it
is compact in size, it will be useful as a
lens that you can easily carry around.
Cheap
price
Since the fixed focus lens has a simpler
design than the zoom lens, the parts and
material costs required for manufacturing are
low, and the selling price is set
reasonably. Models with a wide range of
focal lengths such as 35mm, 50mm, and
85mm are available, so you can enjoy the
depth of the picture while changing the lens.
Focal
length of a fixed focus lens
We mentioned that Micro Four Thirds reduces
the length of one side of the sensor size to
about half that of the full size, but keep
in mind that the focal length of the lens
is also "half". In other words, if you want
the same angle of view as a full-frame
lens, you need to choose half the focal
length with Micro Four Thirds. For example,
if you want a full-frame equivalent of 50mm,
choose 25mm for Micro Four Thirds
lenses. This article mainly introduces three
types of focal lengths. Choose the perfect
focal length according to the distance to the
subject, the shooting environment, and your
shooting image. Check for
more here.
Standard unit focal point
25mm/50mm equivalent (35mm conversion)
It is a lens with a focal length equivalent
to 25 mm in Micro Four Thirds and 50 mm in 35
mm (full size) conversion. It is said to be
the closest to the naked eye and is also
popular with camera beginners. There is no
doubt that it will be useful in a wide range
of scenes, from street snapshots to portrait
photography.
Wide-angle fixed focus lens /
equivalent to about 5 to 17.5mm / 10mm to
35mm (35mm format equivalent)
A wide-angle fixed focus lens can capture a
larger view than the naked eye. It is used
when you want to take pictures with a three-
dimensional effect such as nature, buildings,
and landscapes. It will also be useful in
situations such as group photography where
you take a picture away from the
subject. The weak point is that the image is
easily distorted. However, there are also
cameramen and photographers who dare to
distort and take portraits that give a
photogenic impression. Keep in mind that the
smaller the number, the wider the landscape
and the larger the image.
Telephoto fixed focal length
lens / approx. 35mm ~ (35mm format
equivalent)
A telephoto fixed focus lens that can shoot
farther than a standard fixed focus
lens. This lens is mainly used for shooting
situations where it is difficult to get close
to the subject, such as children's athletic
meet, sports, wild birds, and railroads. The
larger the focal length number, the farther
you can see. On the other hand, please note
that the larger the focal length number, the
longer and larger the lens, and the higher
the selling price tends to be.
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