Good condition Canon Teleconverter FD 2x-B #57598

The Canon Extender FD 2x-B is a 2x teleconverter for Canon FD mount SLR cameras.
This is not a standalone product, but an accessory used in combination with specific FD mount compatible lenses.

Key Features Magnification: 2x Magnifies the focal length of the attached lens by 2x.
Example: 100mm lens → Magnified to 200mm. F-stop Change The f-stop will become 2 stops darker (aperture value increases by 2 stops). Example: F4 lens → Changes to F8. In low light conditions, you will need to slow down the shutter speed or increase the ISO sensitivity. FD Mount Compatible Compatible with Canon FD mount lenses and cameras (manual focus only).

Type B (Universal Design) The B series teleconverters are universal models compatible with a wider range of FD lenses. They can be used with standard and telephoto lenses (85mm and above).
Manual Focus (MF) No autofocus function.
Completely manual focus operation is required.

[Appearance]
Clean, but with some dirt.
Please check the photos for details.

[Functionality]
Works properly.

[Optical System]
Thin fungus on the rear lens (does not affect shooting)
No dirt
No scratches
No stains
No balsam separation
Minor dust (does not affect shooting)

[Accessories]
Front cap
Rear cap

Thank you for looking.