diff --git a/examples/models/inplane_oriented_thick_pol3d_vector.py b/examples/models/inplane_oriented_thick_pol3d_vector.py
index 72f01d4..c173632 100644
--- a/examples/models/inplane_oriented_thick_pol3d_vector.py
+++ b/examples/models/inplane_oriented_thick_pol3d_vector.py
@@ -66,19 +66,19 @@
     intensity_to_stokes_matrix,
 )
 
-# Reconstruct
-fzyx_object_recon = (
-    inplane_oriented_thick_pol3d_vector.apply_inverse_transfer_function(
-        szyx_data,
-        singular_system,
-        intensity_to_stokes_matrix,
-        regularization_strength=1e-1,
-    )
-)
+# from waveorder.visuals.napari_visuals import add_transfer_function_to_viewer
+
+# add_transfer_function_to_viewer(
+#     viewer,
+#     singular_system[1],
+#     zyx_scale=(z_pixel_size, yx_pixel_size, yx_pixel_size),
+#     layer_name="Singular Values",
+# )
+# import pdb; pdb.set_trace()
+
 
 # Display
 arrays = [
-    (fzyx_object_recon, "Object - recon"),
     (szyx_data, "Data"),
     (fzyx_object, "Object"),
 ]
@@ -86,6 +86,22 @@
 for array in arrays:
     viewer.add_image(torch.real(array[0]).cpu().numpy(), name=array[1])
 
+
+# Reconstruct
+for reg_strength in [0.005, 0.008, 0.01, 0.05, 0.1]:
+    fzyx_object_recon = (
+        inplane_oriented_thick_pol3d_vector.apply_inverse_transfer_function(
+            szyx_data,
+            singular_system,
+            intensity_to_stokes_matrix,
+            regularization_strength=reg_strength,
+        )
+    )
+    viewer.add_image(
+        torch.real(fzyx_object_recon).cpu().numpy(),
+        name=f"Object - recon, reg_strength={reg_strength}",
+    )
+
 viewer.grid.enabled = True
 viewer.grid.shape = (2, 5)
 import pdb
diff --git a/waveorder/models/inplane_oriented_thick_pol3d_vector.py b/waveorder/models/inplane_oriented_thick_pol3d_vector.py
index 1df364a..94e9938 100644
--- a/waveorder/models/inplane_oriented_thick_pol3d_vector.py
+++ b/waveorder/models/inplane_oriented_thick_pol3d_vector.py
@@ -1,9 +1,10 @@
 import torch
+import tqdm
 import numpy as np
 
 from torch import Tensor
 from typing import Literal
-from torch.nn.functional import avg_pool3d
+from torch.nn.functional import avg_pool3d, interpolate
 from waveorder import optics, sampling, stokes, util
 from waveorder.visuals.napari_visuals import add_transfer_function_to_viewer
 
@@ -40,6 +41,7 @@ def calculate_transfer_function(
     numerical_aperture_detection,
     invert_phase_contrast=False,
     fourier_oversample_factor=1,
+    transverse_downsample_factor=1,
 ):
     if z_padding != 0:
         raise NotImplementedError("Padding not implemented for this model")
@@ -58,15 +60,34 @@ def calculate_transfer_function(
     yx_factor = int(np.ceil(yx_pixel_size / transverse_nyquist))
     z_factor = int(np.ceil(z_pixel_size / axial_nyquist))
 
+    print("YX factor:", yx_factor)
+    print("Z factor:", z_factor)
+
+    tf_calculation_shape = (
+        zyx_shape[0] * z_factor * fourier_oversample_factor,
+        int(
+            np.ceil(
+                zyx_shape[1]
+                * yx_factor
+                * fourier_oversample_factor
+                / transverse_downsample_factor
+            )
+        ),
+        int(
+            np.ceil(
+                zyx_shape[2]
+                * yx_factor
+                * fourier_oversample_factor
+                / transverse_downsample_factor
+            )
+        ),
+    )
+
     sfZYX_transfer_function, intensity_to_stokes_matrix = (
         _calculate_wrap_unsafe_transfer_function(
             swing,
             scheme,
-            (
-                zyx_shape[0] * z_factor * fourier_oversample_factor,
-                zyx_shape[1] * yx_factor * fourier_oversample_factor,
-                zyx_shape[2] * yx_factor * fourier_oversample_factor,
-            ),
+            tf_calculation_shape,
             yx_pixel_size / yx_factor,
             z_pixel_size / z_factor,
             wavelength_illumination,
@@ -96,11 +117,29 @@ def calculate_transfer_function(
         pooled_sfZYX_transfer_function.shape[1],
         zyx_shape[0] + 2 * z_padding,
     ) + zyx_shape[1:]
+
+    cropped = sampling.nd_fourier_central_cuboid(
+        pooled_sfZYX_transfer_function, sfzyx_out_shape
+    )
+
+    # Compute singular system on cropped and downsampled
+    U, S, Vh = calculate_singular_system(cropped)
+
+    # Interpolate to final size in YX
+    def complex_interpolate(tensor, zyx_shape):
+        interpolated_real = interpolate(tensor.real, size=zyx_shape)
+        interpolated_imag = interpolate(tensor.imag, size=zyx_shape)
+        return interpolated_real + 1j * interpolated_imag
+    
+    full_cropped = complex_interpolate(cropped, zyx_shape)
+    full_U = complex_interpolate(U, zyx_shape)
+    full_S = interpolate(S[None], size=zyx_shape)[0]  # S is real
+    full_Vh = complex_interpolate(Vh, zyx_shape)
+
     return (
-        sampling.nd_fourier_central_cuboid(
-            pooled_sfZYX_transfer_function, sfzyx_out_shape
-        ),
+        full_cropped,
         intensity_to_stokes_matrix,
+        (full_U, full_S, full_Vh),
     )
 
 
@@ -142,6 +181,7 @@ def _calculate_wrap_unsafe_transfer_function(
     z_frequencies = torch.fft.fftfreq(z_total, d=z_pixel_size)
 
     # 2D pupils
+    print("\tCalculating pupils...")
     ill_pupil = optics.generate_pupil(
         radial_frequencies,
         numerical_aperture_illumination,
@@ -187,6 +227,8 @@ def _calculate_wrap_unsafe_transfer_function(
 
     P_3D = torch.abs(torch.fft.ifft(P, dim=-3)).type(torch.complex64)
     S_3D = torch.fft.ifft(S, dim=-3)
+
+    print("\tCalculating greens tensor spectrum...")
     G_3D = optics.generate_greens_tensor_spectrum(
         zyx_shape=(z_total, zyx_shape[1], zyx_shape[2]),
         zyx_pixel_size=(z_pixel_size, yx_pixel_size, yx_pixel_size),