diff --git a/RELEASE.md b/RELEASE.md
index 8762827..a48c221 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,5 +1,11 @@
 # Release notes
 
+## HEAD 
+
+### New Features: 
+
+- setter and getter for nSigma for ClusterFinder ``aare.ClusterFinder().nSigma = 2``, ``aare.ClusterFinderMT().set_nSigma(2)`` 
+
 ## 2026.3.17
 
 ### New Features:
diff --git a/include/aare/ClusterFinder.hpp b/include/aare/ClusterFinder.hpp
index 7d059ff..83b5c78 100644
--- a/include/aare/ClusterFinder.hpp
+++ b/include/aare/ClusterFinder.hpp
@@ -23,7 +23,7 @@ template <typename ClusterType = Cluster<int32_t, 3, 3>,
           typename = std::enable_if_t<no_2x2_cluster<ClusterType>::value>>
 class ClusterFinder {
     Shape<2> m_image_size;
-    const PEDESTAL_TYPE m_nSigma;
+    PEDESTAL_TYPE m_nSigma;
     const PEDESTAL_TYPE c2;
     const PEDESTAL_TYPE c3;
     Pedestal<PEDESTAL_TYPE> m_pedestal;
@@ -53,6 +53,10 @@ class ClusterFinder {
                       << ", nSigma: " << nSigma << ", capacity: " << capacity;
     }
 
+    void set_nSigma(PEDESTAL_TYPE nSigma) { m_nSigma = nSigma; }
+
+    PEDESTAL_TYPE get_nSigma() const { return m_nSigma; }
+
     void push_pedestal_frame(NDView<FRAME_TYPE, 2> frame) {
         m_pedestal.push(frame);
     }
diff --git a/include/aare/ClusterFinderMT.hpp b/include/aare/ClusterFinderMT.hpp
index b5df766..d4ff001 100644
--- a/include/aare/ClusterFinderMT.hpp
+++ b/include/aare/ClusterFinderMT.hpp
@@ -284,6 +284,23 @@ class ClusterFinderMT {
     //     auto rc = m_input_queue.write(std::move(frame));
     //     fmt::print("pushed frame {}\n", rc);
     // }
+
+    /**
+     * @brief Set the nSigma value for all the cluster finders.
+     * @param nSigma number of sigma above the pedestal to consider a photon
+     * during cluster finding.
+     */
+    void set_nSigma(const PEDESTAL_TYPE nSigma) {
+        // Wait for all queues to be empty before changing the sigma
+        for (auto &q : m_input_queues) {
+            while (!q->isEmpty()) {
+                std::this_thread::sleep_for(m_default_wait);
+            }
+        }
+        for (auto &cf : m_cluster_finders) {
+            cf->set_nSigma(nSigma);
+        }
+    }
 };
 
 } // namespace aare
\ No newline at end of file
diff --git a/python/src/bind_ClusterFinder.hpp b/python/src/bind_ClusterFinder.hpp
index 49e203b..da479dc 100644
--- a/python/src/bind_ClusterFinder.hpp
+++ b/python/src/bind_ClusterFinder.hpp
@@ -33,6 +33,13 @@ void define_ClusterFinder(py::module &m, const std::string &typestr) {
         m, class_name.c_str())
         .def(py::init<Shape<2>, pd_type, size_t>(), py::arg("image_size"),
              py::arg("n_sigma") = 5.0, py::arg("capacity") = 1'000'000)
+
+        .def_property(
+            "nSigma",
+            &ClusterFinder<ClusterType, uint16_t, pd_type>::get_nSigma,
+            &ClusterFinder<ClusterType, uint16_t, pd_type>::set_nSigma,
+            R"(number of sigma above the pedestal to consider a photon during cluster finding.)")
+
         .def("push_pedestal_frame",
              [](ClusterFinder<ClusterType, uint16_t, pd_type> &self,
                 py::array_t<uint16_t> frame) {
diff --git a/python/src/bind_ClusterFinderMT.hpp b/python/src/bind_ClusterFinderMT.hpp
index c03eeeb..4bb8101 100644
--- a/python/src/bind_ClusterFinderMT.hpp
+++ b/python/src/bind_ClusterFinderMT.hpp
@@ -76,7 +76,12 @@ void define_ClusterFinderMT(py::module &m, const std::string &typestr) {
                 *arr = self.noise(thread_index);
                 return return_image_data(arr);
             },
-            py::arg("thread_index") = 0);
+            py::arg("thread_index") = 0)
+
+        .def("set_nSigma",
+             &ClusterFinderMT<ClusterType, uint16_t, pd_type>::set_nSigma,
+             py::arg("nSigma"),
+             R"(sets the number of sigma for all cluster finders.)");
 }
 
 #pragma GCC diagnostic pop
\ No newline at end of file