Quick answer
Measure your day optic's objective lens outer diameter, then pick a clamping adapter that matches that measurement. The LIEMKE KA-MC series offers 56mm, 62mm, and 65mm options.
Why size matters for clamping adapters
A clamping adapter creates a secure bridge between your day optic and a thermal imaging attachment. If the adapter is too small, it won't fit; too large, and it won't clamp firmly. The inner diameter of the adapter must match the outer diameter of your scope's objective bell or eyepiece. The LIEMKE KA-MC adapters are designed specifically for this purpose, with a low profile and a wide clamping surface for extra stability.
What about rubber coating and protection?
All LIEMKE KA-MC adapters include a rubber coating on the inner flange to protect the front of your day optics from scratches. This is a practical feature regardless of the size you choose, so your selection should focus on the diameter fit rather than protection differences.
Frequently asked questions about clamping adapter sizes
How do I measure my day optic for a clamping adapter?
Use a caliper or ruler to measure the outer diameter of the objective lens housing (the bell-shaped part at the front). Do not measure the glass itself. The measurement in millimeters tells you which adapter size to buy.
What if my scope diameter is between two sizes?
If your measurement is between 56mm and 62mm, for example, you need to check if the adapter has any adjustability. The LIEMKE KA-MC adapters are fixed inner diameters, so you must match it exactly. No adapter from this series will safely clamp a 58mm objective. Always measure precisely; a 1mm difference can mean a loose or impossible fit.
Can I use a 62mm adapter on a 65mm scope?
No. A 62mm adapter will not fit over a 65mm objective bell. You need the exact size or a slightly larger adapter. There is no universal clamping adapter that expands or contracts significantly. Buy the size that matches your measurement; do not attempt to force a smaller adapter.
LIEMKE clamping adapter options
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LIEMKE Clamp Adaptor 56mm Adapter: 56mm inner diameter, designed for thermal imaging attachments on day optics, with a low profile and wide clamping surface. Ideal if your day optic's objective lens outer diameter measures 56mm; the rubber coating protects the lens housing.
LIEMKE Clamp Adaptor 56mm Adapter
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Clamp Adapter KA-MC 62 mm Adapter: 62mm inner diameter, same low-profile design and rubber-coated inner flange as the 56mm version. Choose this when your scope measures 62mm; it offers a stable hold for larger objective bells.
Clamp Adapter KA-MC 62 mm Adapter
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LIEMKE Clamp Adaptor KA-MC 65m Adapter: 65mm inner diameter, same design and protective rubber coating as the other KA-MC adapters. Best for optics with a 65mm objective diameter, providing a precise and stable clamp without slipping.
