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Our custom made "T-Minus" rings get their name from the fact that they are shorter than the "T2" standard. Normal T-Rings for Sony E-Mount cameras are typically ~37mm deep tubes. Our "T-Minus" rings are only 10mm deep. This is very useful for reflector owners who often don't have quite enough focus range to reach focus with a camera. They are also useful anytime you can use some extra focus room, such as for using a flip mirror or other accessory on a refractor. These quality rings are CNC machined of aluminum with a durable black anodized finish. This item is "T" threaded for standard 42mm (.75) accessories. Please see our other item (PART#TMNEX48) for WIDE (48mm) connections.