diff --git a/ndbioimage/__init__.py b/ndbioimage/__init__.py
index 87adefb..e77f428 100755
--- a/ndbioimage/__init__.py
+++ b/ndbioimage/__init__.py
@@ -1401,8 +1401,12 @@ class AbstractReader(Imread, metaclass=ABCMeta):
         else:
             self.objective = None
         try:
-            t0 = find(image.pixels.planes, the_c=0, the_t=0, the_z=0).delta_t
-            t1 = find(image.pixels.planes, the_c=0, the_t=self.shape["t"] - 1, the_z=0).delta_t
+            t0 = find(image.pixels.planes, the_c=0, the_t=0, the_z=0).delta_t_quantity.to(self.ureg.s).m
+            t1 = (
+                find(image.pixels.planes, the_c=0, the_t=self.shape["t"] - 1, the_z=0)
+                .delta_t_quantity.to(self.ureg.s)
+                .m
+            )
             self.timeinterval = (t1 - t0) / (self.shape["t"] - 1) if self.shape["t"] > 1 and t1 > t0 else None
         except AttributeError:
             self.timeinterval = None
diff --git a/ndbioimage/readers/tifread.py b/ndbioimage/readers/tifread.py
index 2a2de5f..d82aac4 100644
--- a/ndbioimage/readers/tifread.py
+++ b/ndbioimage/readers/tifread.py
@@ -34,15 +34,22 @@ class Reader(AbstractReader, ABC):
 
     def get_ome(self):
         if self.reader.is_ome:
-            match = re.match(r"^(.*)(pos.*)$", self.path.stem, flags=re.IGNORECASE)
-            if match is not None and len(match.groups()) == 2:
-                a, b = match.groups()
-                with tifffile.TiffFile(self.path.with_stem(a + re.sub(r"\d", "0", b))) as file0:
-                    with warnings.catch_warnings():
-                        warnings.simplefilter("ignore", category=UserWarning)
-                        ome = from_xml(file0.ome_metadata)
-                        ome.images = [image for image in ome.images if self.path.stem[: len(image.name)] == image.name]
-                        return ome
+            match = re.match(r"^(.*)(pos[\d_]+)(.*)$", self.path.name, flags=re.IGNORECASE)
+            if match is not None and len(match.groups()) == 3:
+                a, b, c = match.groups()
+                pat = re.compile(f"^{re.escape(a)}" + re.sub(r"\d+", r"\\d+", b) + f"{re.escape(c)}$")
+                for file in sorted(self.path.parent.iterdir(), key=lambda i: (len(i.name), i.name)):
+                    if pat.match(file.name):
+                        with tifffile.TiffFile(file) as tif:
+                            with warnings.catch_warnings():
+                                warnings.simplefilter("ignore", category=UserWarning)
+                                ome = from_xml(tif.ome_metadata)
+                                ome.images = [
+                                    image for image in ome.images if self.path.stem[: len(image.name)] == image.name
+                                ]
+                                if ome.images:
+                                    return ome
+            warnings.warn("could not find the ome.tif file containing the metadata")
 
         page = self.reader.pages[0]
         size_y = page.imagelength
diff --git a/pyproject.toml b/pyproject.toml
index 910e219..5ec76c8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "ndbioimage"
-version = "2025.9.0"
+version = "2025.10.0"
 description = "Bio image reading, metadata and some affine registration."
 authors = [
     { name = "W. Pomp", email = "w.pomp@nki.nl" }