up: Scanner Lenses

date: May 26, 2018
source: https://www.closeuphotography.com/rodenstock-magnagon-75mm-scanner-lens

The Magnagon 5.6/75 is a special lens made for the scanner industry by Rodenstock for use with linear scanner CCDs using low-dispersion glass for lateral and longitudinal chromatic aberration control. The Magnagon 75mm f/5.6 lens you see above was removed from Fuji Lanovia Sprint C550 high-end flatbed scanner. An f/8 version of the Magnagon lens is used in Hasselblad Flextight X5 scanner

TECHNICAL DETAILS

• **Rodenstock Linos Magnagon 75mm f/5.6 Scanner Lens
• Rodenstock part number:** 0703.027.000.024
• Filter threads: None. Deep red filter is installed at the factory with a retaining ring.
• Lens Mount: Standard M39 lens mount which is 39mm x 26tpi also known as Leica Thread-Mount (LTM).
• Typical used price: $300-500.
• Type: High resolution CCD scanners using XY Zoom (XYZ) technology
• Focal length: 75mm
• Aperture: Fixed aperture f/5.6. Measured at f/6.1. Best performance at f/5.6.
• Optical Design: Special low-dispersion glass used in this lens for CA, and LoCA correction.
• Chromatic Correction: No problems, lens is well corrected.
• Magnification range: 1:5 to 3:1. Used at 0.25x to 3x in the Fuji C550 Lanovia scanner.
• Coverage: 72mm linear CCD
• Normal or reverse mounting: Normal.
• Notes: Typically the Magnagon has a red dot on the lens barrel for best azimuth.
• Scanners that use the Magnagon 5.6/75:
  • Agfa XY15 scanner flatbed
  • Fuji Lanovia Sprint C550 flatbed
  • Hasselblad Flextight X5 scanner (f/8 version)

Rodenstock Magnagon 75mm f/5.6 Scanner Lens with filter removed

The Red Filter

In testing I found that the lens is optimized to work with the filter so it should be left in place for photography. Without the filter the lens is slightly sharper but suffers from CAs or lateral chromatic aberrations. With the filter in place the Magnagon is free from CAs.

Normally a deep red filter is used in machine vision applications to pass UV and cut visible light but in this case the filter does not seem to have this kind of effect in this case.

Like:
Sharpness
APO chromatic correction
Compact iris housing

Can live with:
Built-in red filter

Disappointed with:
Lack of iris
Conservative maximum aperture
Can be hard to locate on the used market

Image Quality: very good sharpness and free from chromatic aberrations from edge to edge.