This macro ring set consists of 5 parts:

• front female Canon EF mount
• rear male Canon EF mount
• spacer #1 (7mm)
• spacer #2 (14mm)
• spacer #3 (28mm)

The connection thread between these parts is M60x.075.

Minimum extension distance (just front and rear part) - 16mm

Maximum extension distance (all 5 parts assembled) - 65mm

This is a Chinese product. We tested it before listing it for sale. Both the lens and camera connections are a bit more loose than genuine Canon EF connection, but still OK for not very heavy lenses.

We bought these sets to use the front parts (female Canon EF) as components for other special adapters, since we can't make female bayonets properly ourselves. You can find these sets cheaper in other stores, but if you buy something else from us, you may want to add this set to the cart to save on shipping.