Description
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.
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M42 & M48 contains 12 individual spacer rings, with 3 different thicknesses. 4 of each thickness is included: 0.4/0.6/1.0 mm.
M54 contains 9 individual spacer rings, with 3 different thicknesses. 3 of each thickness is included: 0.4/0.6/1.0 mm.
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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.
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This item is made out of UV resistant PETG plastic and can handle up to 80C (176F) temperatures without deformation.
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