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To measure your lens' focus ring circumference, do the following:
1. download one of the ruler files here:
US is for US 8 1/2 x 11" paper
A4 is for Europe paper size
IMPORTANT: Make sure to print out the ruler at 100% size, do not scale to fit.
2. Cut out the ruler and wrap around the focus ring of your lens. Make sure
to wrap it around the focus ring, not other parts of the lens such as the
filter
3. Record the measurement of your focus ring's circumference. The following
chart will help you understand which ring to purchase:
| If your lens circumference is within |
Your Redrock Lens Gear Size is |
| 180mm-220mm |
32-A |
| 211mm-250mm |
32-B |
| 241mm-280mm |
32-C |
| 280mm-320mm |
32-D |
If your focus ring circumference can be used with more than one Redrock lens
gear, you can select either lens gear.
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