diff --git a/src/reconstruction.rs b/src/reconstruction.rs
index 510c43a..ab8fb08 100644
--- a/src/reconstruction.rs
+++ b/src/reconstruction.rs
@@ -23,7 +23,6 @@ const TIFFTAG_META_QUANTA: exif::Tag = exif::Tag(exif::Context::Tiff, 34682);
 struct SourceImage {
     img: GrayImage,
     scale: (f32, f32),
-    focal_length_native: Option<f64>,
     focal_length_35mm: Option<u32>,
     tilt_angle: Option<f32>,
     filename: String,
@@ -34,7 +33,6 @@ struct ImageMeta {
     scale: (f32, f32),
     tilt_angle: Option<f32>,
     databar_height: u32,
-    focal_length_native: Option<f64>,
     focal_length_35mm: Option<u32>,
 }
 
@@ -47,7 +45,6 @@ impl SourceImage {
         Ok(SourceImage {
             img: img.to_image(),
             scale: metadata.scale,
-            focal_length_native: metadata.focal_length_native,
             focal_length_35mm: metadata.focal_length_35mm,
             tilt_angle: metadata.tilt_angle,
             filename: path.to_string(),
@@ -67,7 +64,6 @@ impl SourceImage {
             scale: (1.0, 1.0),
             tilt_angle: None,
             databar_height: 0,
-            focal_length_native: None,
             focal_length_35mm: None,
         };
         match SourceImage::get_metadata_exif(path) {
@@ -92,7 +88,6 @@ impl SourceImage {
             scale: (1.0, 1.0),
             tilt_angle: None,
             databar_height: 0,
-            focal_length_native: None,
             focal_length_35mm: None,
         };
         let sem_metadata = if let Some(metadata) = sem_metadata {
@@ -144,40 +139,6 @@ impl SourceImage {
         {
             result_metadata.focal_length_35mm = focal_length.value.get_uint(0);
         }
-        if let Some(focal_length) = exif.get_field(exif::Tag::FocalLength, exif::In::PRIMARY) {
-            let value = match focal_length.value {
-                exif::Value::Rational(ref vec) => {
-                    if !vec.is_empty() {
-                        Some(vec[0].to_f64())
-                    } else {
-                        None
-                    }
-                }
-                exif::Value::SRational(ref vec) => {
-                    if !vec.is_empty() {
-                        Some(vec[0].to_f64())
-                    } else {
-                        None
-                    }
-                }
-                exif::Value::Float(ref vec) => {
-                    if !vec.is_empty() {
-                        Some(vec[0] as f64)
-                    } else {
-                        None
-                    }
-                }
-                exif::Value::Double(ref vec) => {
-                    if !vec.is_empty() {
-                        Some(vec[0])
-                    } else {
-                        None
-                    }
-                }
-                _ => None,
-            };
-            result_metadata.focal_length_native = value;
-        }
         Ok(result_metadata)
     }
 
@@ -202,20 +163,13 @@ impl SourceImage {
     fn calibration_matrix(&self, focal_length_35mm: Option<u32>) -> Matrix3<f64> {
         // Scale focal length: f_img/f_35mm == diagonal / diagonal(24mm x 36mm) (because 35mm equivalent is based on diagonal length)
         let diagonal_35mm = (24.0f64 * 24.0 + 36.0 * 36.0).sqrt();
-        //let ratio_35mm = 36.0 / 24.0;
         let width = self.img.width() as f64;
         let height = self.img.height() as f64;
-        //let (width, height) = (width.max(height), width.min(height));
-        //let width = height * ratio_35mm;
-
         let diagonal = (width * width + height * height).sqrt();
         let focal_length = focal_length_35mm.or(self.focal_length_35mm).unwrap_or(1) as f64
             * diagonal
             / diagonal_35mm;
 
-        //let max_width = self.img.width().max(self.img.height()) as f64;
-        //let focal_length = focal_length_35mm.or(self.focal_length_35mm).unwrap_or(1) as f64 / 36.0 * max_width;
-
         Matrix3::new(
             focal_length,
             0.0,