The 100mm extension ring allows you to increase the effective length by 100 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for ...
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The 17mm extension ring allows you to increase the effective length by 17 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for your ...
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The 20mm extension ring allows you to increase the effective length by 20 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for your ...
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The 25mm extension ring allows you to increase the effective length by 25 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for your ...
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The 26mm extension ring allows you to increase the effective length by 26 mm in a B120 porthole configuration. The mechanism on the ring allows the use of a second gear, for zoom ...
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The 30mm extension ring allows you to increase the effective length by 30 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for your ...
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The 40mm extension ring allows you to increase the effective length by 40 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for your ...
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The 50mm extension ring allows you to increase the effective length by 50 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for your ...
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The 60mm extension ring allows you to increase the effective length by 60 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for your ...
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The 70mm extension ring allows you to increase the effective length by 70 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for your ...
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The 80mm extension ring allows you to increase the effective length by 80 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for your ...
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The 90mm extension ring allows you to increase the effective length by 90 mm in a B120 porthole configuration. Check the port chart to determine the optimal ring size for your ...
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