<s>
The	O
Canon	O
TS-E	O
17	O
mm	O
4L	O
is	O
a	O
tilt-shift	O
,	O
ultra-wide-angle	O
prime	O
lens	O
that	O
provides	O
the	O
equivalent	O
of	O
the	O
corresponding	O
view	B-Algorithm
camera	I-Algorithm
front	O
movements	O
on	O
Canon	B-Algorithm
EOS	I-Algorithm
camera	O
bodies	O
.	O
</s>
<s>
Unlike	O
most	O
other	O
EF-mount	B-Application
lenses	O
,	O
it	O
does	O
not	O
provide	O
autofocus	O
.	O
</s>
<s>
Unlike	O
most	O
view	B-Algorithm
cameras	I-Algorithm
,	O
the	O
shift	O
mechanism	O
allows	O
shifts	O
along	O
only	O
one	O
axis	O
,	O
and	O
the	O
tilt	O
mechanism	O
allows	O
tilts	O
about	O
only	O
one	O
axis	O
;	O
however	O
,	O
the	O
rotation	O
of	O
the	O
mechanisms	O
allows	O
the	O
orientations	O
of	O
the	O
axes	O
to	O
be	O
changed	O
,	O
providing	O
,	O
in	O
effect	O
,	O
combined	O
tilt	O
and	O
swing	O
,	O
and	O
combined	O
rise/fall	O
and	O
lateral	O
shift	O
.	O
</s>
