This adapter is purposed to to replace the part indicated with the arrow on the diagram. It is being delivered with a QHY 678M camera, and when coupled with a focal reducer, it causes vignetting. If you have no need for either a UV-IR filter or an IR long-pass filter, you may replace it with this shorter adapter.

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Adapter Front Side	M28.5x0.6
Adapter Rear Side	M30x0.75
Adapter Added Length	4.5mm
Material	Aluminium
Manufacturer	RafCamera
Advantages	Design: Many of our products were inspired by customers, and have great application value. Material: Aluminium alloy 2024 (used in aviation and space industry). It is light and durable. Technology: Cutting from solid bars provides the highest possible product quality. Tolerances: A bit tight fit is better than too loose fit for imaging equipment.

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