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- Description
1. Improvement of the contrast of images of observed objects
2. Can be used not only for astronomical observation but also for astrophotography
2. Ideal for observing faint and low-contrast deep-sky objects
3. Significantly reduces light pollution, ideal for urban and suburban observations
4. Material: optical glass lens, aluminium frame
5. Thread: standard M28.5 x 0.6mm
6. Diameter of lens barrel: 1.25 inch
7. Net weight: about 5.2g
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