<s>
Originally	O
produced	O
by	O
Minolta	O
,	O
then	O
by	O
Sony	O
,	O
the	O
AF	O
Reflex	O
500mm	O
f/8	O
was	O
a	O
catadioptric	O
photographic	O
lens	O
compatible	O
with	O
cameras	O
using	O
the	O
Minolta	B-Algorithm
A-mount	I-Algorithm
and	O
Sony	B-Algorithm
A-mount	I-Algorithm
lens	B-Algorithm
mounts	I-Algorithm
.	O
</s>
<s>
There	O
are	O
other	O
mirror	O
lenses	O
that	O
can	O
mount	O
onto	O
current	O
mounts	O
such	O
as	O
Canon	B-Application
EF-mount	I-Application
and	O
Nikon	B-Architecture
F-mount	I-Architecture
,	O
but	O
all	O
of	O
these	O
mirror	O
lenses	O
are	O
manual	O
focus	O
only	O
.	O
</s>
<s>
In	O
terms	O
of	O
the	O
Minolta	O
AF	O
and	O
subsequent	O
Sony	B-Algorithm
α	I-Algorithm
SLR	O
systems	O
,	O
this	O
lens	O
is	O
an	O
anomaly	O
,	O
being	O
the	O
only	O
lens	O
guaranteed	O
to	O
auto	O
focus	O
at	O
8	O
.	O
</s>
<s>
Minolta	O
also	O
produced	O
a	O
V-mount	B-Algorithm
400	O
mm	O
f/8	O
Reflex	O
lens	O
that	O
can	O
autofocus	O
at	O
8	O
,	O
but	O
only	O
the	O
Minolta	B-Algorithm
Vectis	I-Algorithm
S-1	I-Algorithm
,	O
Minolta	B-Algorithm
Vectis	I-Algorithm
S-100	I-Algorithm
and	O
Minolta	B-Algorithm
Dimâge	I-Algorithm
RD	I-Algorithm
3000	I-Algorithm
can	O
use	O
it	O
.	O
</s>
<s>
The	O
mirror	O
design	O
does	O
not	O
utilize	O
aperture	B-General_Concept
blades	O
,	O
and	O
thus	O
the	O
aperture	B-General_Concept
of	O
the	O
lens	O
is	O
fixed	O
at	O
8	O
.	O
</s>
<s>
By	O
using	O
a	O
mirror	O
design	O
similar	O
to	O
that	O
of	O
a	O
telescope	O
,	O
this	O
lens	O
uses	O
very	O
little	O
glass	O
compared	O
to	O
traditional	O
telephoto	O
lenses	O
and	O
is	O
thus	O
much	O
smaller	O
,	O
lighter	O
,	O
and	O
far	O
less	O
expensive	O
than	O
traditional	O
lenses	O
in	O
the	O
same	O
focal	B-Algorithm
length	I-Algorithm
.	O
</s>
