Quick answer
Choose a body cap that matches your camera's lens mount exactly. Canon FD, Micro 4/3, Fuji X, and G mount caps are not interchangeable, so always buy the cap designed for your specific system.
Why mount-specific caps matter
Each camera system uses a unique bayonet or breech-lock design. A Micro 4/3 cap will not lock onto a Fuji X mount, and a Canon FD cap won't fit a G mount. Using the wrong cap risks dust entering the sensor chamber or the cap falling off during transport.
Body caps are inexpensive insurance. They seal the mount when a lens is not attached, protecting the mirror, shutter, or sensor from dust, moisture, and accidental contact.
What to look for in a body cap
Fit is the only critical factor. The cap must lock securely without wobble. Material matters less, but a rigid plastic cap with a snug fit is standard for most systems.
Price is typically low across all mounts, so there is little reason to skip a cap. A missing cap leaves your camera vulnerable.
Frequently asked questions about body caps
Can I use a Micro 4/3 body cap on a Fuji X camera?
No. The bayonet lug positions and diameter differ. A Micro 4/3 cap will not lock onto a Fuji X mount, and forcing it can damage the mount.
Is a Canon FD body cap the same as a modern Canon EF cap?
No. Canon FD uses a breech-lock ring, while EF uses a bayonet mount. They are not compatible. Always match the cap to the exact mount generation. Check your camera's mount type before ordering.
Do I need a body cap for a Fujifilm G mount camera?
Yes. G mount cameras (GFX series) have a larger throat diameter than Fuji X. Use a dedicated G mount cap to keep the sensor protected.
Will any generic body cap work?
Only if it is specifically designed for your mount. Generic caps often lack the precise locking tabs, leading to poor fit or accidental detachment. Stick to caps labeled for your exact mount system.
How do I attach a body cap correctly?
Align the cap's index mark with the mount's dot or line, push gently, and twist clockwise until it clicks or locks. Do not overtighten. Remove the cap by pressing the lens release button and twisting counterclockwise.
Product facts
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ProMaster Body Cap – Micro 4/3: Price Guarantee Rent Now The ProMaster Body Cap for Micro 4/3 is a budget-friendly way to seal your Olympus or Panasonic camera when no lens is mounted.
ProMaster Body Cap – Micro 4/3
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Dot Line Body Cap for Canon FL/FD: Price Guarantee Rent Now The Dot Line Body Cap for Canon FL/FD ensures your vintage Canon SLR stays dust-free without breaking the bank.
Dot Line Body Cap for Canon FL/FD
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ProMaster Body Cap – Fuji X: Price Guarantee Rent Now The ProMaster Body Cap for Fuji X is a simple, low-cost solution to protect the sensor on your Fujifilm mirrorless camera.
