Testing: Untested due to lack of specialized equipment/mount setup.
Optics: Features hairline scratches and visible fungus on internal elements.
Cleaning Note: The lens has deliberately been left uncleaned in its original found condition to preserve authenticity and original vintage patina, as qualified technicians specializing in historical military photogrammetric optics are rare.
Cosmetics: Shows age-appropriate wear on the housing consistent with vintage military/aviation surplus. Please inspect all detailed photos carefully before bidding.
The Metrogon 6" f/6.3 holds an important place in 20th-century aviation and optical engineering history:
WWII & Post-War Mapping: Developed based on the famous Topogon optical formula, the Metrogon was manufactured primarily by Bausch & Lomb and Fairchild for mid-century aerial reconnaissance and photogrammetric survey cameras (such as the K-17, K-37, and T-11 series).
Massive Coverage: Designed to cover a huge $9 \times 9\text{ inch}$ film format with extreme wide-angle coverage and controlled distortion, allowing high-altitude aircraft to map large swathes of terrain in a single frame.
Legacy: Today, these lenses are highly sought after by aviation historians, military militaria collectors, and custom optical enthusiasts who adapt vintage aerial glass for modern large-format or experimental art photography.
Please Note: Sold strictly AS-IS for restoration, parts, or display. No returns accepted based on optical condition described above. Feel free to reach out with any questions prior to bidding!