Promaster Automatic Macro Extension Tube Set (11mm and 16mm ) for Canon RF Mount eBayUsedAuction the locking force is 3

the locking force is 3 times the original

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The ergonomic handle

In Pixel Shift Multi-Shot mode

USB Type-A is the original design for the USB standard with a flat and rectangular shape

Promaster Automatic Macro Extension Tube Set (11mm and 16mm ) for Canon RF Mount eBayUsedAuction the locking force is 3Extension tubes are a perfect solution to allow ultra close focusing without sacrificing the optical properties of your lens. ProMaster Macro Automatic Extension Tubes are engineered for a precise fit and proper communications between your camera lens and body. The ProMaster 6527 Automatic Extension Tube Set for Canon RF mount includes two tubes that can be used individually or in combination to gain the right magnification for your particular need.