diff --git a/DeviceAdapters/EvidentIX85Win/EvidentHubWin.cpp b/DeviceAdapters/EvidentIX85Win/EvidentHubWin.cpp
index 2acf57eb7..4e90cf4c6 100644
--- a/DeviceAdapters/EvidentIX85Win/EvidentHubWin.cpp
+++ b/DeviceAdapters/EvidentIX85Win/EvidentHubWin.cpp
@@ -977,6 +977,19 @@ int EvidentHubWin::ExecuteCommand(const std::string& command, std::string& respo
    return ret;
 }
 
+void EvidentHubWin::ExecuteCommandFireAndForget(const std::string& command,
+                                                 std::function<void(int, const std::string&)> callback)
+{
+   CommandTask task(command);
+   task.completionCallback = std::move(callback);
+
+   {
+      std::lock_guard<std::mutex> lock(queueMutex_);
+      commandQueue_.push(std::move(task));
+   }
+   queueCV_.notify_one();
+}
+
 void EvidentHubWin::CommandWorkerThread()
 {
    while (workerRunning_)
@@ -1008,16 +1021,25 @@ void EvidentHubWin::CommandWorkerThread()
 
       // Execute command (outside queue lock to allow new submissions)
       std::string response;
+      int ret = DEVICE_ERR;
 
       try
       {
-         int ret = ExecuteCommandInternal(task.command, response);
-         task.responsePromise.set_value(std::make_pair(ret, response));
+         ret = ExecuteCommandInternal(task.command, response);
       }
       catch (...)
       {
-         task.responsePromise.set_exception(std::current_exception());
+         if (task.completionCallback)
+            task.completionCallback(DEVICE_ERR, "");
+         else
+            task.responsePromise.set_exception(std::current_exception());
+         continue;
       }
+
+      if (task.completionCallback)
+         task.completionCallback(ret, response);
+      else
+         task.responsePromise.set_value(std::make_pair(ret, response));
    }
 }
 
@@ -1259,8 +1281,9 @@ int EvidentHubWin::DoDeviceDetection()
         model_.SetDevicePresent(DeviceType_OffsetLens, true);
         availableDevices_.push_back(DeviceType_OffsetLens);
         detectedDevicesByName_.push_back(g_OffsetLensDeviceName);
+        model_.SetLimits(DeviceType_OffsetLens, OFFSET_LENS_MIN_POS, OFFSET_LENS_MAX_POS);
 
-        // Query initial offset lens position
+        // Query initial offset lens position and hardware range
         QueryOffsetLens();
     }
 
@@ -1874,12 +1897,81 @@ int EvidentHubWin::QueryOffsetLens()
     {
         int pos = ParseIntParameter(params[0]);
         model_.SetPosition(DeviceType_OffsetLens, pos);
+
+        long nosepiecePos = model_.GetPosition(DeviceType_Nosepiece);
+        if (nosepiecePos >= 1 && nosepiecePos <= NOSEPIECE_MAX_POS)
+            QueryOffsetLensRange(static_cast<int>(nosepiecePos));
+        else
+            model_.SetLimits(DeviceType_OffsetLens, OFFSET_LENS_MIN_POS, OFFSET_LENS_MAX_POS);
+
         return DEVICE_OK;
     }
 
     return ERR_DEVICE_NOT_AVAILABLE;
 }
 
+int EvidentHubWin::QueryOffsetLensRange(int nosepiecePos)
+{
+    std::string cmd = BuildCommand(CMD_OFFSET_LENS_RANGE, nosepiecePos);
+    std::string response;
+    int ret = ExecuteCommand(cmd, response);
+    if (ret != DEVICE_OK)
+    {
+        model_.SetLimits(DeviceType_OffsetLens, OFFSET_LENS_MIN_POS, OFFSET_LENS_MAX_POS);
+        return ret;
+    }
+
+    ApplyOffsetLensRange(nosepiecePos, ret, response);
+    return DEVICE_OK;
+}
+
+void EvidentHubWin::QueryOffsetLensRangeAsync(int nosepiecePos)
+{
+    std::string cmd = BuildCommand(CMD_OFFSET_LENS_RANGE, nosepiecePos);
+    ExecuteCommandFireAndForget(cmd,
+        [this, nosepiecePos](int ret, const std::string& response)
+        {
+            ApplyOffsetLensRange(nosepiecePos, ret, response);
+        });
+}
+
+void EvidentHubWin::ApplyOffsetLensRange(int nosepiecePos, int ret, const std::string& response)
+{
+    if (ret != DEVICE_OK)
+    {
+        model_.SetLimits(DeviceType_OffsetLens, OFFSET_LENS_MIN_POS, OFFSET_LENS_MAX_POS);
+        return;
+    }
+
+    std::vector<std::string> params = ParseParameters(response);
+    if (params.size() >= 2)
+    {
+        long lower = ParseLongParameter(params[0]);
+        long upper = ParseLongParameter(params[1]);
+
+        if (lower >= OFFSET_LENS_MIN_POS && upper <= OFFSET_LENS_MAX_POS && lower <= upper)
+        {
+            model_.SetLimits(DeviceType_OffsetLens, lower, upper);
+            std::ostringstream msg;
+            msg << "Offset lens range for nosepiece " << nosepiecePos
+                << ": " << lower << " to " << upper << " steps";
+            LogMessage(msg.str().c_str(), true);
+            return;
+        }
+
+        std::ostringstream msg;
+        msg << "Invalid GABRANGE response for nosepiece " << nosepiecePos
+            << ": lower=" << lower << " upper=" << upper << "; using defaults";
+        LogMessage(msg.str().c_str(), false);
+    }
+    else
+    {
+        LogMessage("GABRANGE response missing parameters; using defaults", false);
+    }
+
+    model_.SetLimits(DeviceType_OffsetLens, OFFSET_LENS_MIN_POS, OFFSET_LENS_MAX_POS);
+}
+
 int EvidentHubWin::UpdateNosepieceIndicator(int position)
 {
     // Check if MCU is present
@@ -2173,6 +2265,10 @@ void EvidentHubWin::ProcessNotification(const std::string& message)
         {
             model_.SetPosition(DeviceType_Nosepiece, pos);
 
+            // Refresh offset lens range for the new objective (async — must not block callback thread)
+            if (model_.IsDevicePresent(DeviceType_OffsetLens) && pos >= 1 && pos <= NOSEPIECE_MAX_POS)
+                QueryOffsetLensRangeAsync(pos);
+
             // Note: MCU indicator I1 is updated automatically by SDK when using OBSEQ
 
             // Check if we've reached the target position
diff --git a/DeviceAdapters/EvidentIX85Win/EvidentHubWin.h b/DeviceAdapters/EvidentIX85Win/EvidentHubWin.h
index 6d6cb7973..4f1d70006 100644
--- a/DeviceAdapters/EvidentIX85Win/EvidentHubWin.h
+++ b/DeviceAdapters/EvidentIX85Win/EvidentHubWin.h
@@ -33,6 +33,7 @@
 #include <string>
 #include <vector>
 #include <queue>
+#include <functional>
 #include <future>
 #include <thread>
 #include <atomic>
@@ -42,6 +43,7 @@ struct CommandTask
 {
    std::string command;
    std::promise<std::pair<int, std::string>> responsePromise;
+   std::function<void(int, const std::string&)> completionCallback;  // optional fire-and-forget path
 
    CommandTask(std::string cmd) : command(std::move(cmd)) {}
 
@@ -84,6 +86,8 @@ class EvidentHubWin : public HubBase<EvidentHubWin>
     // Command execution (thread-safe with worker thread queue)
     std::future<std::pair<int, std::string>> ExecuteCommandAsync(const std::string& command);
     int ExecuteCommand(const std::string& command, std::string& response);
+    void ExecuteCommandFireAndForget(const std::string& command,
+                                     std::function<void(int, const std::string&)> callback);
     int SendCommand(const std::string& command);
     int GetResponse(std::string& response, long timeoutMs = -1);
 
@@ -149,6 +153,9 @@ class EvidentHubWin : public HubBase<EvidentHubWin>
     int QueryCorrectionCollar();
     int QueryManualControl();
     int QueryOffsetLens();
+    int QueryOffsetLensRange(int nosepiecePos);       // blocking — call only from non-callback context
+    void QueryOffsetLensRangeAsync(int nosepiecePos); // non-blocking — safe from SDK callback thread
+    void ApplyOffsetLensRange(int nosepiecePos, int ret, const std::string& response);
 
     // Manual Control Unit (MCU) helpers
     int UpdateNosepieceIndicator(int position);
diff --git a/DeviceAdapters/EvidentIX85Win/EvidentIX85Win.cpp b/DeviceAdapters/EvidentIX85Win/EvidentIX85Win.cpp
index dbcce95e6..575506a47 100644
--- a/DeviceAdapters/EvidentIX85Win/EvidentIX85Win.cpp
+++ b/DeviceAdapters/EvidentIX85Win/EvidentIX85Win.cpp
@@ -5056,9 +5056,11 @@ int EvidentOffsetLens::SetPositionUm(double pos)
     // Convert μm to steps
     long steps = static_cast<long>(pos / stepSizeUm_);
 
-    // Clamp to limits
-    if (steps < OFFSET_LENS_MIN_POS) steps = OFFSET_LENS_MIN_POS;
-    if (steps > OFFSET_LENS_MAX_POS) steps = OFFSET_LENS_MAX_POS;
+    // Clamp to hardware-reported limits for the current objective
+    long minSteps, maxSteps;
+    hub->GetModel()->GetLimits(EvidentIX85Win::DeviceType_OffsetLens, minSteps, maxSteps);
+    if (steps < minSteps) steps = minSteps;
+    if (steps > maxSteps) steps = maxSteps;
 
     hub->GetModel()->SetBusy(EvidentIX85Win::DeviceType_OffsetLens, true);
 
@@ -5117,8 +5119,19 @@ int EvidentOffsetLens::SetOrigin()
 
 int EvidentOffsetLens::GetLimits(double& lower, double& upper)
 {
-    lower = OFFSET_LENS_MIN_POS * stepSizeUm_;
-    upper = OFFSET_LENS_MAX_POS * stepSizeUm_;
+    EvidentHubWin* hub = GetHub();
+    if (hub)
+    {
+        long minSteps, maxSteps;
+        hub->GetModel()->GetLimits(EvidentIX85Win::DeviceType_OffsetLens, minSteps, maxSteps);
+        lower = minSteps * stepSizeUm_;
+        upper = maxSteps * stepSizeUm_;
+    }
+    else
+    {
+        lower = OFFSET_LENS_MIN_POS * stepSizeUm_;
+        upper = OFFSET_LENS_MAX_POS * stepSizeUm_;
+    }
     return DEVICE_OK;
 }
 
diff --git a/DeviceAdapters/EvidentIX85Win/EvidentProtocolWin.h b/DeviceAdapters/EvidentIX85Win/EvidentProtocolWin.h
index 7d6e300be..846bb99fa 100644
--- a/DeviceAdapters/EvidentIX85Win/EvidentProtocolWin.h
+++ b/DeviceAdapters/EvidentIX85Win/EvidentProtocolWin.h
@@ -152,7 +152,7 @@ const char* const CMD_OFFSET_LENS_MOVE = "ABM";
 const char* const CMD_OFFSET_LENS_STOP = "ABSTP";
 const char* const CMD_OFFSET_LENS_POSITION = "ABP";
 const char* const CMD_OFFSET_LENS_NOTIFY = "NABP";
-const char* const CMD_OFFSET_LENS_RANGE = "ABRANGE";
+const char* const CMD_OFFSET_LENS_RANGE = "GABRANGE";
 const char* const CMD_OFFSET_LENS_LIMIT = "ABLMT";
 const char* const CMD_OFFSET_LENS_LOST_MOTION = "ABLM";
 const char* const CMD_OFFSET_LENS_BASE_POSITION = "ABBP";