<s>
The	O
smc	O
Pentax-F	O
17	O
–	O
28mm	O
Fish-eye	O
3.5	O
–	O
4.5	O
is	O
the	O
first	O
fisheye	O
zoom	O
lens	O
,	O
manufactured	O
by	O
Pentax	B-Application
for	O
single-lens	B-Algorithm
reflex	I-Algorithm
cameras	I-Algorithm
(	O
SLRs	B-Algorithm
)	O
with	O
a	O
K	B-Algorithm
lens	I-Algorithm
mount	I-Algorithm
.	O
</s>
<s>
At	O
its	O
widest	O
setting	O
of	O
17mm	O
,	O
it	O
affords	O
a	O
180°	O
diagonal	O
angle	O
of	O
view	O
images	O
for	O
all	O
K-mount	B-Algorithm
full-frame	O
SLR	B-Algorithm
cameras	I-Algorithm
;	O
at	O
28mm	O
,	O
the	O
diagonal	O
angle	O
of	O
view	O
is	O
reduced	O
to	O
90°	O
on	O
the	O
diagonal	O
.	O
</s>
<s>
A	O
successor	O
model	O
,	O
the	O
Pentax	B-Application
DA	O
10-17mm	O
lens	O
,	O
was	O
introduced	O
with	O
the	O
same	O
view	O
angles	O
and	O
closer	O
focusing	O
capability	O
for	O
APS-C	O
cameras	O
in	O
2006	O
.	O
</s>
