Astrodymium Colour Coded Fine Tuning Spacer Rings for M54 Threads (9x)

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Astrodymium Colour Coded Fine Tuning Spacer Rings for M54 Threads (9x)

These rings slip over the thread of an adapter/extension tube, and are primarily used for fine tuning backfocus when doing astrophotography, but they can be used for other purposes as well.

Each set of M54 contains 9 individual spacer rings, with 3 different thicknesses. 3 of each thickness is included: 0.4/0.6/1.0 mm.

Each ring is also colour coded for easy identification.

• Red - 0.4mm
• Blue - 0.6mm
• Black - 1.0mm

Each ring has an inner diameter that is 0.5mm larger than the specified size, for good clearance on the threads - They will not get stuck and are easy to insert or remove. 

This item is made out of ABS plastic and can handle up to 85ºC (185ºF) temperatures without deformation.

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