Rusan Adapters are a simple and effective way of attaching a thermal clip-on device to your scopes objective bell. Once the adapter is screwed on to your thermal clip-on you simply slip it over the front lens of your scope and move the lever to the clamp closed position. The attachment takes just a few seconds. The Rusan adapter slips over approximately 1.4” of your objective lens so there’s lots of clamping surface area for a great hold. The inside of the adapter is lined with a special film to provide for extra gripping power and assures a scratch free attachment.
Important Notice
It is the outside diameter of your scope lens housing that determines the adapter size needed, not your lens size.
For example, Swarovski scopes with 50mm objective lenses have an external housing diameter of 56mm. For a Swarovski 50mm scope you would need Rusan Adapter Model: ARM52-56. It is the last two numbers in the product SKU that indicate adapter size.
Rusan Adapter are a simple and secure way of attaching a night vision or thermal clip-on device to your day scopes objective bell. Once the adapter is screwed onto the device you simply slip it over the front lens of your scope and move the lever to the “clamp closed” position. The attachment takes just a few seconds. The adapter slips over approximately 1.4” of your objective lens so there is lots of clamping surface area for a great hold. The inside of the adapter is lined with a special film to provide for extra gripping power and also assures a scratch free attachment.
If your model is not listed on the chart or you would like to confirm measurements, to determine the exact Rusan Adapter model you’ll need measure in millimeters the outside diameter of your objective lens at its end then consult our choices below. Note: It is not the objective lens size of your scope that determines the Rusan Adapter you need, it’s the outside diameter of the housing. The measurement needs to be exact so use calipers. Take the measurement you obtain in millimeters and then round up to the nearest whole number (eg. 57.5mm would use a 58mm Rusan Adapter). The adapter does have some fit adjustment capability and you may need to do a final best fit adjustment when you receive your adapter, a tool is provided for this purpose. A proper and best fit is when the clamp closes with slight resistance. If aggressive force is required to close the lever then the adapter is too tight and must be adjusted as damage to objective lens is possible if squeezed by the adapter too aggressively.
Note: The adapter is approximately .125” thick and we recommended that the space between the bottom of your scope’s objective lens and your barrel, or rail, be a minimum of .25”.
