<s>
The	O
Nikon	B-Algorithm
F-mount	I-Algorithm
teleconverters	I-Algorithm
are	O
a	O
group	O
of	O
magnifying	O
lenses	O
mounted	O
between	O
the	O
lens	O
and	O
camera	O
bodies	O
using	O
the	O
Nikon	B-Architecture
F-mount	I-Architecture
.	O
</s>
<s>
Sometimes	O
teleconverters	O
do	O
not	O
convert	O
aperture	O
and	O
focal	B-Algorithm
length	I-Algorithm
data	O
included	O
in	O
the	O
Exif	O
information	O
,	O
even	O
if	O
the	O
actual	O
focus	O
and	O
exposure	O
still	O
will	O
be	O
correct	O
.	O
</s>
<s>
Teleconverters	O
are	O
often	O
recommended	O
only	O
for	O
lenses	O
with	O
minimum	O
telephoto	O
focal	B-Algorithm
length	I-Algorithm
or	O
equivalent	O
zoom	O
range	O
.	O
</s>
<s>
Although	O
not	O
recommended	O
,	O
teleconverters	O
are	O
used	O
in	O
the	O
Nikon	B-Algorithm
1	I-Algorithm
series	I-Algorithm
with	O
Mount	O
Adapter	O
FT1	O
for	O
extreme	O
telephotos	O
.	O
</s>
