功能

• A filter with a frame for dimming visible light.
• Since it is an absorption type, stray light due to reflection is small, and the wavelength characteristic of transmitted light does not change significantly due to dimming.
• Since the transmittance is finely divided, the light can be dimmed to various light levels.
• Furthermore, by combining multiple filters, subtle light adjustment is possible.
• A frame is attached to the filter so it can be fixed to the filter holder (FH).
• There is no filter holder for frame diameter φ30 mm.
• Use the lens holder (LHF-30 S).
• If an absorbent fixed ND filter is placed near a light source, the filter may break due to sudden temperature changes.
• If the filter is subjected to heat strengthening treatment, the filter will not break easily even if the temperature rises.
• If the filter is thermally tempered, the dimension will be large and may exceed the tolerance range.
• * Cannot be used for high power laser.
• * There is a risk of damage if used.
• * Use a reflective ND filter (FND) for high power laser.
• * The transmittance wavelength characteristics vary depending on the manufacturing lot.
• * In particular, the wavelength characteristics outside the applicable wavelength may differ greatly depending on the manufacturing lot.
• * Use a reflective filter (FND) if the wavelength range is wider than the specified wavelength range.
• * The ND filter does not have an anti-reflection coat, so the reflection is about 4%.