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Lens Ring for Sigma 8mm
Fisheye Nikon Mount
Quick Reference Guide
© 2012 Nodal Ninja
Support: www.nodalninja.com/forum
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The lens ring consists of a metal outer ring and a plastic inner ring that fits the lens snugly. The
plastic ring allows reproducible mounting of lens and protects the lens from stress by
providing maximum area of contact to the lens.
Preparing the Lens for Ring Mounting
Tape the Focus Ring
1
Mark 3
Mark 2
1
.5
Mark 1
Add Reference Mark
1
.5
Mark 4
for Camera Roll Angle
Reproducing Focus Distance Scale
Manual focus is preferred for making
stitched panos. The focus distance scale will
be hidden by the lens ring. Users are
recommended to use tape to fix the focus
ring at around 0.5-1m on the scale and use
an aperture of f/8. For best sharpness, do
tests to find the optimal focus distance and
aperture settings for different situations. If
not taped, the focus ring is still movable
with the lens ring installed. Users can use
live view to set a focus distance where the
distant and near objects are both in focus.
Alternatively, the distance scale can be
reproduced on visible area of the lens barrel
with labels. Turn the focus ring to the
desired distance. Place labels at the
positions indicated. Put Mark 1 on the label
on the focus ring. This is the new reference
mark. Then put Mark 2 on the label above.
To mark more distances, turn the focus ring
to other distances of interest and add the
marks. Mark 3 and Mark 4 are at focus
distances at 1m and 0.5m respectively.
A reference mark for roll angle can also be
added for accurate alignment.
Installing the Lens Ring to the Lens
Squeeze
Anchor
Point
User Added
Reference Mark
Loosen the knob on the outer ring until its
slit is about 6mm (1/4") wide. Squeeze to
take out the inner ring. Check the label on
the inner ring to confirm with the lens in use
and the direction of mounting. The arrow
should point to the front of lens.
Align the slit on the inner ring to the left of
the focus scale. Insert the lens. Stretch the
ring when necessary. Move it to a position
where it fits snugly.
Push it against the
anchor point to ensure reproducible
mounting and consistent NPP settings.
Fix the inner ring with a piece of tape about
40mm (1.5") long. Stretch the tape so that
the ring will grasp the lens firmly. This
prevents movement of inner ring when
outer ring is rotated, thus protecting the
paint of lens barrel. Cut any tape that goes
beyond the trimmed area of the inner ring.
Align the outer ring to the slit of inner ring.
Insert the outer ring (loosen its knob further
if needed) from the back of the lens. Tighten
its knob slightly. Rotate the outer ring so
that it snaps to the inner ring and rotates
smoothly. Optionally align the notch
indicated to the user added reference mark.
Tighten the knob fully.
Mount the lens to the camera. Loosen the
knob on the ring to align the LRP to the lens
release button on the camera. The camera
will be in portrait mode with handgrip
pointing up. Loosen the knob on the ring to
rotate to other angles. Use the notches (at
30° interval) at the back of ring and the
added reference mark for accurate roll
angle alignment.
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