diff --git a/src/eventio/simtel/objects.py b/src/eventio/simtel/objects.py
index acdfff6..c4ba425 100644
--- a/src/eventio/simtel/objects.py
+++ b/src/eventio/simtel/objects.py
@@ -10,6 +10,7 @@
     read_float,
     read_string,
     read_from,
+    read_unsigned_short,
     read_var_string,
     read_varint,
     read_unsigned_varint,
@@ -1142,7 +1143,7 @@ def __str__(self):
         )
 
     def parse(self):
-        assert_exact_version(self, supported_version=5)
+        assert_version_in(self, supported_versions={5, 6})
         self.seek(0)
         byte_stream = BytesIO(self.read())
 
@@ -1154,12 +1155,14 @@ def parse(self):
             (flags & 0xff) | (flags & 0x3f000000) >> 16
         )
         tel_image['cut_id'] = (flags & 0xff000) >> 12
-        tel_image['pixels'] = read_short(byte_stream)
-        tel_image['n_sat'] = read_short(byte_stream)
 
-        # from version 6 on
-        # pixels = read_varint(self)  # from version 6 on
-        # n_sat = read_varint(self)
+
+        if self.header.version >= 6:
+            tel_image['pixels'] = read_varint(byte_stream)
+            tel_image['n_sat'] = read_varint(byte_stream)
+        else:
+            tel_image['pixels'] = read_short(byte_stream)
+            tel_image['n_sat'] = read_short(byte_stream)
 
         if tel_image['n_sat'] > 0:
             tel_image['clip_amp'] = read_float(byte_stream)
@@ -1187,12 +1190,20 @@ def parse(self):
             tel_image['kurtosis_err'] = read_float(byte_stream)
 
         if flags & 0x400:
-            # from v6 on this is crazy int
-            n_hot = read_short(byte_stream)
+            if self.header.version >= 6:
+                n_hot = read_varint(byte_stream)
+            else:
+                n_hot = read_short(byte_stream)
+
             tel_image['n_hot'] = n_hot
             tel_image['hot_amp'] = read_array(byte_stream, 'f4', n_hot)
-            # from v6 on this is array of crazy int
-            tel_image['hot_pixel'] = read_array(byte_stream, 'i2', n_hot)
+
+            if self.header.version >= 6:
+                data = read_remaining_with_check(byte_stream, self.header.content_size)
+                tel_image["hot_pixel"], bytes_read = varint_array(data, n_hot)
+                byte_stream = BytesIO(data[bytes_read:])
+            else:
+                tel_image['hot_pixel'] = read_array(byte_stream, 'i2', n_hot)
 
         if flags & 0x800:
             tel_image['tm_slope'] = read_float(byte_stream)
@@ -1610,7 +1621,7 @@ def parse(self):
         byte_stream = BytesIO(self.read())
         version = self.header.version
 
-        n_pixels = read_short(byte_stream)
+        n_pixels = read_unsigned_short(byte_stream)
         n_gains = read_short(byte_stream)
         lascal_id = read_int(byte_stream)
         calib = read_array(
@@ -1724,15 +1735,17 @@ def parse(self):
         # even in the prod3b version of Max N the objects
         # of type 2027 seem to be of version 0 only.
         # not sure if version 1 was ever produced.
-        assert_exact_version(self, supported_version=0)
+        assert_max_version(self, last_supported=1)
         self.seek(0)
         byte_stream = BytesIO(self.read())
 
-        pixels = read_short(byte_stream)
-        # in version 1 pixels is a crazy int
-
-        pixel_list = read_array(byte_stream, 'i2', pixels)
-        # in version 1 pixel_list is an array of crazy int
+        if self.header.version < 1:
+            pixels = read_short(byte_stream)
+            pixel_list = read_array(byte_stream, 'i2', pixels)
+        else:
+            pixels = read_varint(byte_stream)
+            data = read_remaining_with_check(byte_stream, self.header.content_size)
+            pixel_list, _ = varint_array(data, pixels)
 
         return {
             'code': self.code,
diff --git a/tests/resources/40k_pixels.simtel.zst b/tests/resources/40k_pixels.simtel.zst
new file mode 100644
index 0000000..38bbe29
Binary files /dev/null and b/tests/resources/40k_pixels.simtel.zst differ
diff --git a/tests/simtel/test_simtel_objects.py b/tests/simtel/test_simtel_objects.py
index 5d50e36..807c06e 100644
--- a/tests/simtel/test_simtel_objects.py
+++ b/tests/simtel/test_simtel_objects.py
@@ -1,3 +1,4 @@
+from itertools import zip_longest
 import pytest
 from pytest import approx
 import numpy as np
@@ -7,7 +8,7 @@
     yield_n_subobjects,
     yield_subobjects,
 )
-from eventio.simtel.objects import TriggerInformation
+from eventio.simtel.objects import ImageParameters, LaserCalibration, PixelList, TriggerInformation
 
 prod2_file = 'tests/resources/gamma_test.simtel.gz'
 camorgan_v2_file = 'tests/resources/test_camorganv2.simtel.gz'
@@ -833,3 +834,37 @@ def test_mono_trigger():
     with EventIOFile("tests/resources/mono_trigger.simtel.zst") as f:
         for trigger in yield_subobjects(f, TriggerInformation):
             trigger.parse()
+
+
+def test_laser_calibration_n_pixels():
+    """Regression test for #264"""
+
+    with EventIOFile("tests/resources/40k_pixels.simtel.zst") as f:
+        for laser_calibration in yield_subobjects(f, LaserCalibration):
+            data = laser_calibration.parse()
+            assert data["calib"].shape == (1, 40000)
+
+
+def test_pixel_list_version_1():
+    """Test for implementation of #265"""
+
+    with EventIOFile("tests/resources/40k_pixels.simtel.zst") as f:
+        expected = [49, 34]
+        for pixel_list, pixels in zip_longest(yield_subobjects(f, PixelList), expected):
+            assert pixel_list.header.version == 1
+            data = pixel_list.parse()
+            assert data["pixels"] == pixels
+            assert data["pixel_list"].shape == (pixels, )
+
+
+def test_image_parameters_version_6():
+    """Test for implementation of #266"""
+
+    with EventIOFile("tests/resources/40k_pixels.simtel.zst") as f:
+        for image_parameters in yield_subobjects(f, ImageParameters):
+            assert image_parameters.header.version == 6
+            data = image_parameters.parse()
+            assert data["hot_amp"].shape == (data["n_hot"], )
+            assert data["hot_amp"].dtype == np.float32
+            assert data["hot_pixel"].shape == (data["n_hot"], )
+            assert data["hot_pixel"].dtype == np.int64