<s>
A	O
dandelion	B-Algorithm
chip	I-Algorithm
is	O
an	O
electronic	O
device	O
,	O
installed	O
on	O
the	O
bayonet	O
mount	O
of	O
a	O
non-electronic	O
camera	O
lens	O
or	O
adapter	O
,	O
which	O
enables	O
electronic	O
interoperation	O
with	O
certain	O
cameras	O
.	O
</s>
<s>
Camera	O
functions	O
enabled	O
by	O
the	O
chip	O
may	O
include	O
exposure	O
metering	O
,	O
aperture	B-General_Concept
display	O
and	O
control	O
,	O
focus	O
confirmation	O
and	O
fine-tuning	O
,	O
and	O
Exif	O
metadata	O
recording	O
.	O
</s>
<s>
For	O
example	O
,	O
professional-level	O
Nikon	O
DSLRs	B-Device
provide	O
metering	O
and	O
focus	O
confirmation	O
,	O
and	O
store	O
lens	O
data	O
programmed	O
into	O
the	O
camera	O
,	O
regardless	O
of	O
whether	O
the	O
mounted	O
lens	O
has	O
electronic	O
contacts	O
.	O
</s>
<s>
By	O
contrast	O
,	O
many	O
consumer-level	O
Nikon	O
DSLRs	B-Device
require	O
an	O
electronically	O
enabled	O
lens	O
to	O
perform	O
functions	O
as	O
basic	O
as	O
metering	O
.	O
</s>
