Rare E. Suter Basel f/4-100 historical brass lens. E. SUTER BASEL f/4-100 - APLANAT B No.3 is less common than the normal f/8-100. Swiss Suter had a strong reputation for excellent aplanats. This is one of them. "Aplanat" is the same as Rapid Rectilinear, which was state-of-the-art at the time. Series B No. 3 has about a 8" (closer to 210mm-220mm) focal length that covers 4x5 and most likely 5x7. Lens comes retaining ring fixed on mahogany lensboard 66x110 mm Both front and rear lens elements are clear and without any issues except light cleaning marks. Very good for a 120-year-old lens. The rear thread diameter for that is about 45mm. The lens elements themselves are about 30mm. Both lens elements unscrew easily for cleaning. Sorry no cap. h: 60,3 mm d: 39,9 mm Aperture: 4, 8, 16, 32, 100 Serial #21696 State: - Very good general condition - Lenses look like new - No fungus or haze. - There is no malfunction whatsoever. - No shock or major defect. - Some very slight normal traces of use on the paint. Shipping weight is approximately 0,4 kg. and sizes 22x15x11 cm. Will be shipped in insured sturdy package by express courier.