Sigma 300mm F/2.8 APO Lens - Canon EF Mount for 35mm SLRs (Fungus)

DESCRIPTION

Sigma 300mm f/2.8 APO professional telephoto prime lens for Canon EF mount, presented in Good condition and fully tested. The lens has internal fungus, and on digital Canon EOS bodies it only operates at f/2.8 due to an aperture communication fault. However, it remains fully working on Canon EF‑mount 35mm SLR film cameras, where aperture control functions normally.

A sample image taken with this lens is included to demonstrate real‑world performance at f/2.8.

This is a powerful, fast telephoto prime ideal for wildlife, sports, aviation and low‑light work, especially for users of Canon film bodies or those seeking a restoration project.

CONDITION

Overall Condition: Good

• Fully tested
• Internal fungus present – cleaning recommended
• Aperture control fault on digital EOS bodies (works only at f/2.8)
• Fully working on Canon EF film SLRs
• Optics otherwise clear
• Coatings intact
• Aperture blades clean and responsive on film bodies
• Autofocus accurate on test bodies
• Focus ring smooth
• Exterior shows light signs of previous use
• Mount clean
• Sample image taken with this lens included

INCLUDED

• Sigma 300mm f/2.8 APO lens – Canon EF mount
• Front lens cap
• Rear lens cap
• Hood
• Case (not Sigma)

KEY FEATURES

• Fast f/2.8 telephoto prime
• APO (Apochromatic) optical correction
• Strong performance for wildlife, sports and aviation
• Full‑frame EF mount
• Excellent low‑light capability
• Compatible with Canon EF film bodies without limitation

COMPATIBILITY NOTES

Canon EF digital bodies:

• Lens only works at f/2.8 (aperture cannot be stopped down)
• Autofocus and metering still function

Canon EF film SLRs:

• Fully working – aperture control and AF operate normally

Mirrorless adaptation:

• Canon RF, Sony E, Nikon Z, Fuji X, L‑mount (manual aperture fixed at f/2.8)

COLLECTORS / TECH NOTES

Early Sigma EF‑mount lenses are known for occasional electronic incompatibilities with later digital EOS bodies. This example behaves normally on film SLRs but defaults to wide‑open operation on digital, making it suitable for film shooters, manual‑focus digital users, or those seeking a restoration/repair project. Fast f/2.8 APO telephoto primes remain desirable for their rendering and low‑light capability.

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