Thank you for your interest in our two lens endoscope camera, we do not currently supply a guide ball. You can refer to the 8mm diameter of the endoscope lens to purchase the guide ball. 

67mm should also be stenciled on the front edge of the lens somewhere. If so, then you should be good to go. It should be on the lens because a lens cap can be lost or broken. 

Unfortunately this is for adapting lenses to Olympus' modern digital Micro 4/3 cameras. It won't work with the Pen FT or similar half-frame film cameras, and you most likely won't find anyone making adapters for these. 

FD-EOS fit for Canon FD mount lens and canon EF mount camera body. canon 60d is EF mount, so the adapter ring can work with your camera, but you need to check your lens mount. could you pls let us know your lens specific model? service(AT)kentfaith(DO NOT)com, Please note: It is not same between Canon FD mount and EF mount, this adapter ring is only for Canon FD mount lens, please contact us if you want to purchase for Canon EF mount lens. 

If your camera indicated "lens is not properly installed", please modify the camera menu settings. Usually called the "release the shutter the lens is not installed", you can modify the settings to allow. Specifically refer to the camera manual.Following are some examples:

1. MFT（M4/3 mount camera）'Lens Not Found' - Warning Message Appears
   For Panasonic Lumix:
   The camera needs to be set to function without a MFT-Mount lens attached. You can do this by changing the following camera setting:
   'Menu' -> 'Custom Menu 5' -> 'Shoot W/O Lens' -> 'On'
   (Exact naming and location of this option may change depending on camera model)
   
2. Fujifilm X mount camera, The camera needs to be set to function without a GFX-Mount lens attached. You can do this by changing the following camera setting:
   'MENU' -> 'SETUP' -> 'BUTTON/DIAL SETTING' -> 'SHOOT WITHOUT LENS' -> 'ON' (Exact naming and location of this option may change depending on camera model) Choose ON to enable the shutter release when no lens is attached.
   
3. Sony E mount camera, 'No Lens Attached' - Warning Message Appears
   The camera needs to be set to function without a E-Mount lens attached. You can do this by changing the following camera setting:'Menu' -> 'Setup' -> 'Release w/o Lens' -> 'Enable'
   (Exact naming and location of this option may change depending on camera model)
   
4. Nikon 1-Series mirrorless camera , 'Check lens. Pictures can only be taken when a lens is attached' - Warning Message Appears
   With a Nikon 1-Series camera (such as the J2), you will need to make sure the camera is in 'Manual' exposure or shooting mode and the focus selection is also set to manual. When in any other mode the camera tries to take control of the lens which is not possible as the adapter does not have any contact with the camera circuitry, so you get the lens check warning as the camera does not think there is a lens attached.
   
5. 'EOS M mirrorless camera ,'No Lens Attached' - Warning Message Appears
   The camera needs to be set to function without a EF-M Mount lens attached. You can do this by changing the following camera setting:
   'Menu' -> 'Custom Menu' -> 'Custom Function 7' -> Select 'Release shutter w/o lens'
   (Exact naming and location of this option may change depending on camera model)
   
6. Konica Minolta:
   For Konica Minolta and "No Lens Attached"
   Custom Menu 3
   First item "Shutter Lock"
   Set it to "Off: no lens"
   (Depending on camera model "Shutter Lock" May be in different menu location)
   
7. 'Samsung NX 'No lens.' - Warning Message Appears
   The adapter is designed to trigger a sensor inside the camera body itself so no setting needs to be changed. If the error message is coming up with one of our adapters attached, then it is possible that the adapter is not hitting that sensor the way that it should. Usually rotating the adapter slightly in the mount, or un-mounting and remounting the adapter clears the problem with no further action needed. If that doesn't solve the problem, then the best course of action would be to swap out the adapter you have with a replacement.