<s>
A	O
mirrorless	B-Device
camera	I-Device
is	O
a	O
photo	O
camera	O
featuring	O
a	O
single	O
,	O
removable	O
lens	O
and	O
a	O
digital	B-Device
display	I-Device
.	O
</s>
<s>
The	O
camera	O
does	O
not	O
have	O
a	O
reflex	O
mirror	O
or	O
optical	O
viewfinder	O
like	O
a	O
digital	B-Device
single-lens	I-Device
reflex	I-Device
(	O
DSLR	B-Device
)	O
camera	O
,	O
but	O
may	O
have	O
an	O
electronic	B-Algorithm
viewfinder	I-Algorithm
.	O
</s>
<s>
Many	O
mirrorless	B-Device
cameras	I-Device
retain	O
a	O
mechanical	O
shutter	O
.	O
</s>
<s>
Like	O
a	O
DSLR	B-Device
,	O
a	O
mirrorless	B-Device
camera	I-Device
accepts	O
any	O
of	O
a	O
series	O
of	O
interchangeable	O
lenses	O
compatible	O
with	O
its	O
lens	B-Algorithm
mount	I-Algorithm
.	O
</s>
<s>
Mirrorless	B-Device
cameras	I-Device
are	O
sometimes	O
referred	O
to	O
as	O
mirrorless	B-Device
interchangeable-lens	I-Device
cameras	I-Device
(	O
MILC	B-Device
)	O
,	O
or	O
digital	O
single-lens	O
mirrorless	B-Device
(	O
DSLM	B-Device
)	O
cameras	O
.	O
</s>
<s>
This	O
latter	O
name	O
highlights	O
their	O
connection	O
to	O
DSLRs	B-Device
.	O
</s>
<s>
Other	O
terms	O
include	O
electronic	B-Algorithm
viewfinder	I-Algorithm
interchangeable	B-Algorithm
lens	I-Algorithm
(	O
EVIL	O
)	O
cameras	O
and	O
compact	B-Device
system	I-Device
cameras	I-Device
(	O
CSCs	O
)	O
.	O
</s>
<s>
Mirrorless	B-Device
cameras	I-Device
are	O
mechanically	O
simpler	O
than	O
DSLR	B-Device
cameras	I-Device
,	O
and	O
are	O
smaller	O
,	O
lighter	O
,	O
and	O
quieter	O
due	O
to	O
the	O
elimination	O
of	O
the	O
moving	O
mirror	O
.	O
</s>
<s>
While	O
nearly	O
all	O
mirrorless	B-Device
cameras	I-Device
have	O
a	O
mechanical	O
shutter	O
,	O
many	O
also	O
have	O
an	O
electronic	O
shutter	O
,	O
allowing	O
completely	O
silent	O
operation	O
.	O
</s>
<s>
Until	O
the	O
mid	O
2010s	O
mirrorless	B-Device
cameras	I-Device
were	O
somewhat	O
challenged	O
to	O
provide	O
an	O
electronic	B-Algorithm
viewfinder	I-Algorithm
with	O
the	O
clarity	O
and	O
low-lag	O
responsiveness	O
of	O
the	O
optical	O
viewfinders	O
used	O
on	O
DSLRs	B-Device
,	O
especially	O
under	O
strong	O
sunlight	O
or	O
when	O
photographing	O
the	O
sky	O
at	O
night	O
.	O
</s>
<s>
As	O
the	O
image	O
from	O
the	O
lens	O
is	O
always	O
projected	O
onto	O
the	O
image	O
sensor	O
,	O
features	O
can	O
be	O
available	O
which	O
are	O
only	O
possible	O
in	O
DSLRs	B-Device
when	O
the	O
mirror	O
is	O
locked	O
up	O
into	O
"	O
live	B-Device
view	I-Device
"	O
mode	O
.	O
</s>
<s>
This	O
includes	O
the	O
ability	O
to	O
show	O
a	O
focus-peaking	B-Algorithm
display	O
,	O
zebra	B-Algorithm
patterning	I-Algorithm
,	O
and	O
face	B-General_Concept
or	I-General_Concept
eye	I-General_Concept
tracking	I-General_Concept
.	O
</s>
<s>
The	O
electronic	B-Algorithm
viewfinder	I-Algorithm
can	O
provide	O
live	O
depth	O
of	O
field	O
preview	O
,	O
can	O
show	O
a	O
poorly-illuminated	O
subject	O
how	O
it	O
would	O
look	O
with	O
correct	O
exposure	O
in	O
real	O
time	O
,	O
and	O
makes	O
it	O
easier	O
to	O
view	O
the	O
results	O
of	O
an	O
exposure	O
in	O
bright	O
sunlight	O
.	O
</s>
<s>
With	O
the	O
latest	O
phase-detect	O
autofocus	O
available	O
on	O
some	O
mirrorless	B-Device
cameras	I-Device
,	O
the	O
autofocus	O
speed	O
and	O
accuracy	O
of	O
some	O
models	O
has	O
been	O
shown	O
to	O
be	O
as	O
good	O
as	O
DSLRs	B-Device
.	O
</s>
<s>
But	O
mirrorless	B-Device
cameras	I-Device
have	O
shorter	O
battery	O
life	O
than	O
DSLRs	B-Device
due	O
to	O
prolonged	O
use	O
of	O
LCD	O
and/or	O
OLED	O
viewfinder	O
displays	O
,	O
and	O
often	O
smaller	O
buffers	O
(	O
to	O
save	O
battery	O
)	O
.	O
</s>
<s>
On-sensor	O
autofocus	O
is	O
free	O
of	O
the	O
adjustment	O
requirements	O
of	O
the	O
indirect	O
focusing	O
system	O
of	O
the	O
DSLR	B-Device
(	O
which	O
relies	O
on	O
a	O
separate	O
autofocus	O
sensor	O
located	O
below	O
the	O
reflex	O
mirror	O
)	O
,	O
and	O
as	O
of	O
2018	O
mirrorless	B-Device
cameras	I-Device
could	O
shoot	O
with	O
phase-detect	O
autofocus	O
at	O
up	O
to	O
20	O
frames	O
per	O
second	O
using	O
up	O
to	O
693	O
focus	O
points	O
—	O
a	O
number	O
far	O
exceeding	O
what	O
was	O
available	O
on	O
any	O
DSLR	B-Device
.	O
</s>
<s>
However	O
,	O
on-sensor	O
phase	O
detection	O
autofocus	O
(	O
except	O
for	O
Canon	O
's	O
Dual	O
Pixel	O
Autofocus	O
)	O
repurposes	O
pixel	O
sites	O
for	O
autofocus	O
acquisition	O
,	O
so	O
that	O
image	O
data	O
is	O
partially	O
or	O
entirely	O
missing	O
for	O
the	O
autofocus	O
"	O
pixels	O
"	O
,	O
which	O
can	O
cause	O
banding	B-Algorithm
artifacts	O
in	O
the	O
final	O
image	O
.	O
</s>
<s>
A	O
full-frame	B-Algorithm
camera	O
is	O
a	O
digital	O
camera	O
with	O
a	O
digital	O
sensor	O
the	O
same	O
size	O
as	O
35	O
mm	O
format	O
(	O
)	O
film	O
.	O
</s>
<s>
Cameras	O
that	O
have	O
a	O
smaller	O
sensor	O
than	O
full-frame	B-Algorithm
(	O
such	O
as	O
APS-C	B-Algorithm
and	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
)	O
differ	O
in	O
having	O
a	O
crop	O
factor	O
.	O
</s>
<s>
Digital	O
cameras	O
with	O
a	O
larger	O
sensor	O
than	O
full-frame	B-Algorithm
are	O
called	O
medium	O
format	O
,	O
after	O
medium	O
format	O
film	O
cameras	O
that	O
use	O
the	O
120	O
and	O
220	O
film	O
formats	O
.	O
</s>
<s>
Sony	O
was	O
the	O
first	O
to	O
introduce	O
a	O
full-frame	B-Algorithm
mirrorless	B-Device
camera	I-Device
,	O
the	O
α7	B-Algorithm
,	O
in	O
2013	O
.	O
</s>
<s>
It	O
was	O
followed	O
by	O
the	O
Leica	B-Algorithm
SL	I-Algorithm
(	O
Typ	O
601	O
)	O
in	O
2015	O
.	O
</s>
<s>
Nikon	B-Algorithm
and	O
Canon	O
each	O
launched	O
full-frame	B-Algorithm
mirrorless	B-Device
cameras	O
in	O
September	O
2018	O
.	O
</s>
<s>
Panasonic	O
and	O
Sigma	O
,	O
under	O
the	O
L-Mount	B-Algorithm
Alliance	I-Algorithm
,	O
announced	O
that	O
they	O
will	O
be	O
using	O
the	O
Leica	B-Algorithm
L-Mount	I-Algorithm
for	O
their	O
own	O
full-frame	B-Algorithm
mirrorless	B-Device
cameras	I-Device
.	O
</s>
<s>
In	O
2013	O
,	O
mirrorless	B-Device
system	I-Device
cameras	I-Device
constituted	O
about	O
five	O
percent	O
of	O
total	O
camera	O
shipments	O
.	O
</s>
<s>
The	O
first	O
digital	O
rangefinder	B-Algorithm
camera	I-Algorithm
commercially	O
marketed	O
was	O
the	O
Epson	B-Algorithm
R-D1	I-Algorithm
(	O
released	O
in	O
2004	O
)	O
,	O
followed	O
by	O
the	O
Leica	B-Algorithm
M8	I-Algorithm
.	O
</s>
<s>
They	O
were	O
some	O
of	O
the	O
first	O
digital	O
lens-interchangeable	O
cameras	O
without	O
a	O
reflex	O
mirror	O
,	O
but	O
they	O
are	O
not	O
mirrorless	B-Device
cameras	I-Device
because	O
they	O
did	O
not	O
use	O
a	O
digital	B-Device
display	I-Device
system	O
for	O
live	B-Device
preview	I-Device
.	O
</s>
<s>
Compact	O
cameras	O
with	O
large	O
sensors	O
,	O
technically	O
akin	O
to	O
the	O
current	O
mirrorless	B-Device
cameras	I-Device
,	O
were	O
also	O
marketed	O
in	O
this	O
period	O
.	O
</s>
<s>
Cameras	O
like	O
Sony	B-Algorithm
Cyber-shot	I-Algorithm
DSC-R1	I-Algorithm
and	O
Sigma	B-Device
DP1	I-Device
proved	O
that	O
live	B-Device
preview	I-Device
operation	O
is	O
possible	O
,	O
and	O
useful	O
with	O
APS-C	B-Algorithm
sized	O
sensors	O
.	O
</s>
<s>
The	O
first	O
mirrorless	B-Device
camera	I-Device
commercially	O
marketed	O
was	O
the	O
Panasonic	B-Device
Lumix	I-Device
DMC-G1	I-Device
,	O
released	O
in	O
Japan	O
in	O
October	O
2008	O
.	O
</s>
<s>
It	O
was	O
also	O
the	O
first	O
camera	O
of	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
system	I-Operating_System
,	O
developed	O
exclusively	O
for	O
the	O
mirrorless	B-Device
ILC	O
system	O
.	O
</s>
<s>
The	O
Ricoh	B-Device
GXR	I-Device
(	O
November	O
2009	O
)	O
had	O
a	O
radically	O
different	O
design	O
.	O
</s>
<s>
The	O
mirrorless	B-Device
camera	I-Device
featured	O
interchangeable	B-Algorithm
lens	I-Algorithm
units	O
–	O
a	O
sealed	O
unit	O
of	O
a	O
lens	O
and	O
sensor	O
,	O
instead	O
of	O
the	O
lens	O
only	O
being	O
interchangeable	O
.	O
</s>
<s>
This	O
design	O
was	O
different	O
from	O
other	O
mirrorless	B-Device
cameras	I-Device
,	O
and	O
received	O
mixed	O
reviews	O
,	O
primarily	O
due	O
to	O
its	O
higher	O
cost	O
.	O
</s>
<s>
Following	O
the	O
introduction	O
of	O
the	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
system	I-Operating_System
,	O
several	O
other	O
cameras	O
were	O
released	O
by	O
Panasonic	O
and	O
Olympus	O
,	O
with	O
the	O
Olympus	B-Algorithm
PEN	I-Algorithm
E-P1	I-Algorithm
(	O
announced	O
June	O
2009	O
)	O
being	O
the	O
first	O
mirrorless	B-Device
camera	I-Device
in	O
a	O
compact	O
size	O
(	O
pocketable	O
with	O
a	O
small	O
lens	O
)	O
.	O
</s>
<s>
The	O
Samsung	B-Algorithm
NX10	I-Algorithm
(	O
announced	O
January	O
2010	O
)	O
was	O
the	O
first	O
camera	O
in	O
this	O
class	O
not	O
using	O
the	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
system	I-Operating_System
,	O
instead	O
utilizing	O
a	O
new	O
,	O
proprietary	O
lens	B-Algorithm
mount	I-Algorithm
(	O
Samsung	B-Algorithm
NX-mount	I-Algorithm
)	O
.	O
</s>
<s>
The	O
Sony	B-Device
Alpha	I-Device
NEX-3	I-Device
and	O
NEX-5	B-Device
(	O
announced	O
May	O
14	O
,	O
2010	O
,	O
and	O
released	O
in	O
July	O
2010	O
)	O
saw	O
Sony	O
enter	O
the	O
market	O
with	O
a	O
new	O
,	O
proprietary	O
lens	B-Algorithm
mount	I-Algorithm
(	O
the	O
Sony	B-Algorithm
E-mount	I-Algorithm
)	O
,	O
though	O
the	O
camera	O
included	O
LA-EA1	O
and	O
LA-EA2	O
adapters	O
for	O
the	O
legacy	O
Minolta	B-Algorithm
A-mount	I-Algorithm
.	O
</s>
<s>
In	O
June	O
2011	O
,	O
Pentax	O
announced	O
the	O
'	O
Q	O
 '	O
mirrorless	B-Device
interchangeable	I-Device
lens	I-Device
camera	I-Device
and	O
the	O
'	O
Q-mount	O
'	O
lens	O
system	O
.	O
</s>
<s>
The	O
Q7	B-Algorithm
,	O
introduced	O
in	O
2013	O
,	O
has	O
a	O
slightly	O
larger	O
1/1.7inch	O
CMOS	O
sensor	O
with	O
the	O
same	O
megapixel	O
count	O
.	O
</s>
<s>
In	O
September	O
2011	O
,	O
Nikon	B-Algorithm
announced	O
their	O
Nikon	B-Algorithm
1	I-Algorithm
system	O
which	O
consists	O
of	O
the	O
Nikon	B-Algorithm
1	I-Algorithm
J1	I-Algorithm
and	O
Nikon	B-Algorithm
1	I-Algorithm
V1	I-Algorithm
cameras	O
and	O
lenses	O
.	O
</s>
<s>
The	O
V1	B-Algorithm
features	O
an	O
electronic	B-Algorithm
viewfinder	I-Algorithm
.	O
</s>
<s>
The	O
series	O
includes	O
high-speed	O
mirrorless	B-Device
cameras	I-Device
which	O
,	O
according	O
to	O
Nikon	B-Algorithm
,	O
had	O
the	O
fastest	O
autofocus	O
and	O
the	O
fastest	O
continuous	O
shooting	O
speed	O
(	O
60fps	O
)	O
of	O
any	O
camera	O
with	O
interchangeable	O
lenses	O
,	O
including	O
DSLRs	B-Device
.	O
</s>
<s>
The	O
Fujifilm	B-Algorithm
X-Pro1	I-Algorithm
,	O
announced	O
in	O
January	O
2012	O
,	O
was	O
the	O
first	O
non-rangefinder	O
mirrorless	B-Device
with	O
a	O
built-in	O
optical	O
viewfinder	O
.	O
</s>
<s>
Its	O
2016	O
successor	O
,	O
the	O
X-Pro2	B-Algorithm
,	O
had	O
an	O
updated	O
version	O
of	O
this	O
viewfinder	O
.	O
</s>
<s>
Beyond	O
just	O
consumer	O
interest	O
,	O
mirrorless	B-Device
lens	O
systems	O
created	O
significant	O
interest	O
from	O
camera	O
manufacturers	O
as	O
a	O
possible	O
alternative	O
to	O
high-end	O
camera	O
manufacturing	O
.	O
</s>
<s>
Mirrorless	B-Device
cameras	I-Device
have	O
fewer	O
moving	O
parts	O
than	O
DSLRs	B-Device
,	O
and	O
are	O
more	O
electronic	O
,	O
which	O
is	O
an	O
advantage	O
to	O
electronic	O
manufacturers	O
(	O
such	O
as	O
Panasonic	O
,	O
and	O
Samsung	O
)	O
,	O
while	O
reducing	O
the	O
advantage	O
that	O
dedicated	O
camera	O
manufacturers	O
have	O
in	O
precision	O
mechanical	O
engineering	O
.	O
</s>
<s>
Sony	O
's	O
entry	O
level	O
full	O
frame	O
mirrorless	B-Device
α7	B-Algorithm
II	I-Algorithm
camera	O
has	O
a	O
24-megapixel	O
5-axis	O
stabilised	O
sensor	O
,	O
but	O
is	O
more	O
compact	O
and	O
less	O
expensive	O
than	O
any	O
full-frame	B-Algorithm
sensor	O
DSLR	B-Device
.	O
</s>
<s>
Canon	O
was	O
the	O
last	O
of	O
the	O
major	O
manufacturer	O
of	O
DSLRs	B-Device
to	O
announce	O
their	O
own	O
mirrorless	B-Device
camera	I-Device
,	O
announcing	O
the	O
Canon	B-Algorithm
EOS	I-Algorithm
M	I-Algorithm
in	O
2012	O
with	O
APS-C	B-Algorithm
sensor	O
and	O
18mm	O
registration	O
distance	O
similar	O
to	O
the	O
one	O
used	O
by	O
NEX	O
.	O
</s>
<s>
In	O
the	O
longer	O
term	O
Olympus	O
decided	O
that	O
mirrorless	B-Device
may	O
replace	O
DSLRs	B-Device
entirely	O
in	O
some	O
categories	O
;	O
Olympus	O
America	O
's	O
DSLR	B-Device
product	O
manager	O
speculated	O
that	O
by	O
2012	O
Olympus	O
DSLRs	B-Device
(	O
the	O
Olympus	O
E	O
system	O
)	O
might	O
be	O
mirrorless	B-Device
,	O
though	O
still	O
using	O
the	O
Four	B-Architecture
Thirds	I-Architecture
System	I-Architecture
(	O
not	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
)	O
.	O
</s>
<s>
Panasonic	O
UK	O
's	O
Lumix	O
G	O
product	O
manager	O
John	O
Mitchell	O
,	O
speaking	O
to	O
the	O
Press	O
at	O
the	O
2011	O
"	O
Focus	O
on	O
Imaging	O
"	O
show	O
in	O
Birmingham	O
,	O
reported	O
that	O
Panasonic	O
"	O
G	O
"	O
camera	O
market	O
share	O
was	O
almost	O
doubling	O
each	O
year	O
,	O
and	O
that	O
the	O
UK	O
Panasonic	O
"	O
G	O
"	O
captured	O
over	O
11%	O
of	O
all	O
interchangeable	O
camera	O
sales	O
in	O
the	O
UK	O
in	O
2010	O
,	O
and	O
that	O
the	O
UK	O
"	O
CSC	O
"	O
sales	O
made	O
up	O
23%	O
of	O
the	O
interchangeable	B-Algorithm
lens	I-Algorithm
market	O
in	O
the	O
UK	O
,	O
and	O
40%	O
in	O
Japan	O
.	O
</s>
<s>
In	O
May	O
2010	O
the	O
prices	O
of	O
interchangeable-lens	B-Algorithm
camera	I-Algorithm
ranged	O
from	O
US$550	O
to	O
$800	O
,	O
a	O
little	O
higher	O
than	O
entry-level	O
DSLRs	B-Device
and	O
significantly	O
more	O
than	O
high-end	O
compact	O
cameras	O
.	O
</s>
<s>
Sony	O
announced	O
their	O
2011	O
sales	O
statistics	O
in	O
September	O
2012	O
,	O
which	O
showed	O
that	O
mirrorless	B-Device
lenses	O
had	O
50%	O
of	O
the	O
interchangeable	B-Algorithm
lens	I-Algorithm
market	O
in	O
Japan	O
,	O
18%	O
in	O
Europe	O
,	O
and	O
23%	O
worldwide	O
.	O
</s>
<s>
Since	O
then	O
,	O
Nikon	B-Algorithm
and	O
others	O
entered	O
the	O
mirrorless	B-Device
market	O
.	O
</s>
<s>
Due	O
to	O
the	O
downward	O
trend	O
of	O
the	O
world	O
camera	O
market	O
,	O
mirrorless	B-Device
camera	I-Device
sales	O
suffered	O
,	O
but	O
not	O
as	O
drastically	O
and	O
was	O
compensated	O
with	O
increase	O
by	O
about	O
12	O
percent	O
in	O
the	O
Japanese	O
mirrorless	B-Device
camera	I-Device
market	O
.	O
</s>
<s>
However	O
,	O
mirrorless	B-Device
cameras	I-Device
took	O
longer	O
to	O
catch	O
on	O
in	O
Europe	O
and	O
North	O
America	O
.	O
</s>
<s>
According	O
to	O
Japanese	O
photo	O
industry	O
sources	O
,	O
mirrorless	B-Device
made	O
up	O
only	O
11.2	O
%	O
of	O
interchangeable-lens	B-Algorithm
cameras	I-Algorithm
shipped	O
to	O
Europe	O
in	O
the	O
first	O
nine	O
months	O
of	O
2013	O
,	O
and	O
10.5	O
%	O
of	O
those	O
shipped	O
to	O
the	O
U.S.	O
in	O
the	O
same	O
period	O
.	O
</s>
<s>
An	O
industry	O
researcher	O
found	O
that	O
mirrorless	B-Device
camera	I-Device
sales	O
in	O
the	O
U.S.	O
fell	O
by	O
about	O
20%	O
in	O
the	O
three	O
weeks	O
leading	O
up	O
to	O
December	O
14	O
,	O
2013	O
—	O
which	O
included	O
the	O
key	O
Black	O
Friday	O
shopping	O
week	O
;	O
in	O
the	O
same	O
period	O
,	O
DSLR	B-Device
sales	O
went	O
up	O
1%	O
.	O
</s>
<s>
Within	O
camera	O
sales	O
,	O
ILCs	O
have	O
seen	O
their	O
market	O
share	O
increasing	O
,	O
with	O
ILCs	O
being	O
30%	O
of	O
overall	O
camera	O
sales	O
,	O
of	O
which	O
DSLRs	B-Device
were	O
77%	O
and	O
mirrorless	B-Device
cameras	I-Device
were	O
23%	O
.	O
</s>
<s>
In	O
the	O
Americas	O
in	O
2015	O
,	O
DSLR	B-Device
annual	O
sales	O
fell	O
by	O
16%	O
per	O
annum	O
,	O
while	O
mirrorless	B-Device
sales	O
over	O
the	O
same	O
12-month	O
period	O
have	O
increased	O
by	O
17%	O
.	O
</s>
<s>
In	O
Japan	O
,	O
mirrorless	B-Device
cameras	I-Device
outsold	O
DSLRs	B-Device
during	O
some	O
parts	O
of	O
the	O
year	O
.	O
</s>
<s>
In	O
2015	O
,	O
mirrorless-cameras	O
accounted	O
for	O
26	O
percent	O
of	O
interchangeable-lens	B-Algorithm
camera	I-Algorithm
sales	O
outside	O
the	O
Americas	O
,	O
although	O
a	O
lesser	O
share	O
of	O
26	O
percent	O
was	O
in	O
the	O
U.S.	O
</s>
<s>
In	O
late	O
2016	O
,	O
Olympus	O
announced	O
their	O
OM-D	B-Algorithm
E-M1	I-Algorithm
Mark	O
II	O
camera	O
,	O
a	O
successor	O
to	O
the	O
earlier	O
and	O
successful	O
Mark	O
I	O
.	O
</s>
<s>
The	O
Mark	O
II	O
model	O
retains	O
a	O
Micro	B-Operating_System
Four	I-Operating_System
Thirds	I-Operating_System
image	O
sensor	O
of	O
17.3x13	O
mm	O
and	O
features	O
a	O
20.4	O
megapixel	O
resolution	O
lens	O
,	O
representing	O
a	O
new	O
generation	O
of	O
mirrorless	B-Device
cameras	I-Device
competitive	O
with	O
and	O
in	O
many	O
respects	O
superior	O
to	O
DSLR	B-Device
cameras	I-Device
.	O
</s>
<s>
In	O
early	O
2017	O
,	O
Sony	O
announces	O
the	O
Alpha-9	O
mirrorless	B-Device
camera	I-Device
,	O
offering	O
693	O
autofocus	O
points	O
,	O
and	O
20	O
frame-per-second	O
shooting	O
.	O
</s>
<s>
In	O
October	O
Sony	O
announces	O
the	O
A7RIII	B-Algorithm
,	O
offering	O
10FPS	O
shooting	O
at	O
42	O
megapixels	O
.	O
</s>
<s>
In	O
early	O
2018	O
,	O
Sony	O
announced	O
the	O
A7III	O
mirrorless	B-Device
camera	I-Device
,	O
bringing	O
the	O
693	O
autofocus	O
points	O
of	O
the	O
A9	O
at	O
a	O
much	O
lower	O
cost	O
.	O
</s>
<s>
In	O
August	O
,	O
Nikon	B-Algorithm
announced	O
its	O
new	O
full-frame	B-Algorithm
mirrorless	B-Device
Z	B-Algorithm
6	I-Algorithm
and	O
Z	B-Algorithm
7	I-Algorithm
cameras	O
,	O
both	O
using	O
a	B-Algorithm
new	I-Algorithm
lens	I-Algorithm
mount	I-Algorithm
.	O
</s>
<s>
Canon	O
announced	O
its	O
first	O
full-frame	B-Algorithm
mirrorless	B-Device
model	O
,	O
the	O
EOS	B-Algorithm
R	I-Algorithm
,	O
and	O
its	O
own	O
new	B-Algorithm
lens	I-Algorithm
mount	I-Algorithm
the	O
next	O
month	O
.	O
</s>
<s>
X-H1	B-Algorithm
:	O
Sensor-based	O
(	O
5-axis	O
IBIS	O
,	O
5.5	O
stops	O
compensation	O
)	O
mm	O
mm	O
Hybrid	O
Contrast-detection/Phase	O
detection	O
autofocus	O
on	O
X-H1	B-Algorithm
,	O
X-T1	B-Algorithm
,	O
X-T2	B-Algorithm
,	O
X-T3	B-Algorithm
,	O
X-Pro2	B-Algorithm
,	O
X-T10	B-Algorithm
,	O
X-T20	B-Algorithm
,	O
X-E2	B-Algorithm
,	O
X-E3	B-Algorithm
,	O
X-A5	B-Algorithm
;	O
Contrast-detection	O
autofocus	O
on	O
other	O
models	O
1.5	O
Current	O
Hasselblad	O
XCD	O
Hasselblad	O
X1D	O
,	O
Hasselblad	O
X1D	O
II	O
50c	O
Hasselblad	O
XCD	O
mount	O
43.8	O
×	O
32.9	O
mm	O
Medium	O
format	O
none	O
?	O
</s>
<s>
Both	O
:	O
Panasonic	O
(	O
Dual	O
IS	O
,	O
Dual	O
IS	O
2	O
)	O
,	O
Olympus	O
(	O
Sync	O
IS	O
)	O
~	O
38	O
mm	O
mmContrast-detection	O
autofocusHybrid	O
contrast-detection/phase	O
detection	O
autofocus	O
:	O
Olympus	B-Algorithm
OM-D	I-Algorithm
E-M1	I-Algorithm
,	O
EM1	O
mark	O
II	O
,	O
EM1	O
,	O
mark	O
III	O
,	O
OM	O
systems	O
OM12.0	O
(	O
G1	O
)	O
Current	O
Nikon	B-Algorithm
1	I-Algorithm
.	O
</s>
<s>
Nikon	B-Algorithm
1	I-Algorithm
J1	I-Algorithm
,	O
V1	B-Algorithm
,	O
J2	B-Algorithm
,	O
V2	B-Algorithm
,	O
J4	B-Algorithm
,	O
V3	B-Algorithm
,	O
J5	B-Algorithm
Nikon	B-Algorithm
1	I-Algorithm
mount	I-Algorithm
13.2	O
×	O
8.8	O
mm	O
1	O
"	O
Nikon	B-Algorithm
CX	I-Algorithm
Lens-based	O
mm	O
mm	O
Hybrid	O
Contrast-detection/Phase	O
detection	O
autofocus2.7	O
Discontinued	O
Nikon	B-Algorithm
Z	I-Algorithm
Z	B-Algorithm
9	I-Algorithm
,	O
Z	B-Algorithm
7II	I-Algorithm
,	O
Z	B-Algorithm
7	I-Algorithm
,	O
Z	B-Algorithm
6II	I-Algorithm
,	O
Z	B-Algorithm
6	I-Algorithm
,	O
Z	B-Algorithm
5	I-Algorithm
,	O
Z	B-Algorithm
50	I-Algorithm
Nikon	B-Algorithm
Z-mount	I-Algorithm
35.9	O
×	O
23.9	O
mm	O
full-frame	B-Algorithm
(	O
Z	O
x	O
)	O
23.5	O
×	O
15.7	O
mm	O
APS-C	B-Algorithm
(	O
Z	B-Algorithm
50	I-Algorithm
)	O
Full-frame	B-Algorithm
:	O
Sensor-based	O
,	O
but	O
can	O
use	O
both	O
IBIS	O
and	O
lens-based	O
stabilization	O
at	O
the	O
same	O
timeAPS-C	O
:	O
Lens-based	O
mm	O
mm	O
Hybrid	O
Contrast-detection/Phase	O
detection	O
autofocus	O
1.0	O
(	O
Z	O
x	O
)	O
,	O
1.5	O
(	O
Z	B-Algorithm
50	I-Algorithm
)	O
Current	O
Pentax	O
K	O
Pentax	B-Algorithm
K-01	I-Algorithm
Pentax	B-Algorithm
K	I-Algorithm
mount	I-Algorithm
23.6	O
×	O
15.6	O
mm	O
APS-C	B-Algorithm
Sensor-based	O
mm	O
mm	O
Contrast-detection	O
autofocus1.53	O
Pentax	B-Device
Q	I-Device
Pentax	B-Device
Q	I-Device
,	O
Q10	B-Algorithm
,	O
Q7	B-Algorithm
,	O
Q-S1	B-Algorithm
Q-mount	O
6.17	O
×	O
4.55	O
mm	O
(	O
1/2.3	O
"	O
)	O
for	O
Q	O
and	O
Q107.44	O
×	O
5.58	O
mm	O
(	O
1/1.7	O
"	O
)	O
for	O
Q7	B-Algorithm
and	O
Q-S1	B-Algorithm
Sensor-based	O
mm	O
mm	O
Contrast-detection	O
autofocus	O
5.5	O
(	O
appx	O
)	O
,	O
Q	O
and	O
Q104.6	O
(	O
appx	O
)	O
,	O
Q7	B-Algorithm
and	O
Q-S1	B-Algorithm
DiscontinuedRicoh	O
GXRRicoh	O
GXRSealed	O
interchangeable	O
sensor	O
lens	O
unit	O
system	O
,	O
and	O
Leica	O
M-mountDepends	O
on	O
each	O
sealed	O
interchangeable	O
sensor	O
lens	O
unit	O
:	O
APS-C	B-Algorithm
,	O
1/1.7	O
"	O
,	O
1/2.3	O
"	O
depends	O
—	O
—	O
Contrast-detection	O
autofocus	O
for	O
sealed	O
camera	O
units	O
,	O
manual	O
focus	O
(	O
display-assisted	O
)	O
for	O
Leica	B-Algorithm
M	I-Algorithm
mount	I-Algorithm
unit	O
1.5	O
DiscontinuedSamsung	O
NXSamsung	O
NX10	B-Algorithm
,	O
NX100	B-Algorithm
,	O
NX200	B-Algorithm
,	O
NX20	B-Device
,	O
NX300	B-Algorithm
,	O
NX30	B-Algorithm
,	O
NX500	B-Algorithm
,	O
NX1Samsung	O
NX-mount23.4	O
×	O
15.6	O
mm	O
APS-CLens-based	O
mm	O
mmHybrid	O
Contrast-detection/Phase	O
detection	O
autofocus1.53	O
Discontinued	O
Sigma	B-Algorithm
SA	I-Algorithm
Sigma	O
SD	O
Quattro	O
,	O
SD	O
Quattro	O
H	O
Sigma	B-Algorithm
SA-mount	I-Algorithm
26.7	O
×	O
17.9	O
mm	O
APS-H	O
(	O
Quattro	O
H	O
)	O
23.4	O
x	O
15.5	O
mm	O
APS-C	B-Algorithm
(	O
Quattro	O
)	O
Lens-based	O
?	O
</s>
