What is this Canon EF mount adapter with PC sync and N3 cables used for?
Asked 9/17/2025
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I received an unusual adapter in a bundle with a Canon 5D and would like to identify its purpose. It appears to mount to a Canon EF camera and has two attached cables: one PC sync connector for flash triggering and one Canon N3 connector for remote shutter release. There is also a slot that seems to let the center optic move. What type of accessory is this, and what would it be used with?
Originally by Mike Sowsun. Source · Licensed CC BY-SA 4.0
Mike Sowsun
8mo ago
2 Answers
7
I believe it allows the use of a Canon DSLR for retinal imaging (wide field of view) with older non-Mydriatic/Fundus cameras/optics.
It doesn't appear to be OEM Canon (Canon white, maybe Topcon?), but here is a manual for a similar product by Canon.
Originally by Steven Kersting. Source · Licensed CC BY-SA 4.0
Steven Kersting
8mo ago
0
Generated from our catalog & community — verify before relying on it.
This is most likely a specialty medical/imaging adapter rather than a standard Canon accessory. Based on the EF mount, the PC sync lead, the Canon N3 remote lead, and the movable central optic, it appears intended to connect a Canon DSLR to a retinal/fundus imaging system, likely for wide-field retinal photography with older non-mydriatic or fundus camera optics. The PC sync connection would handle flash synchronization, while the N3 plug would trigger the camera shutter from the imaging setup. It also does not appear to be a typical OEM Canon consumer part; it may be from Canon or a third-party medical imaging maker used with ophthalmic equipment.
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