<s>
The	O
SMC	O
Pentax-DA	O
50mm	O
f/1.8	O
lens	O
is	O
a	O
normal	O
prime	O
lens	O
for	O
the	O
Pentax	B-Algorithm
K-mount	I-Algorithm
.	O
</s>
<s>
The	O
75mm	O
equivalent	O
focal	O
length	O
on	O
APS-C	B-Algorithm
cameras	O
and	O
fast	O
f/1.8	O
aperture	B-General_Concept
make	O
it	O
well	O
suited	O
for	O
portrait	O
photography	O
.	O
</s>
<s>
Similar	O
lenses	O
from	O
other	O
manufacturers	O
include	O
the	O
Canon	O
EF	O
50mm	O
f/1.8	O
II	O
and	O
Nikon	B-Algorithm
AF	I-Algorithm
Nikkor	I-Algorithm
50	I-Algorithm
mm	I-Algorithm
f/1.8D	I-Algorithm
.	O
</s>
