이혁수 손정영 김상천 박승한 2024-01-21T13:39:48Z 2024-01-21T13:39:48Z 2022-01-10 2000-08 https://pubs.kist.re.kr/handle/201004/141194 Fabrication of neutral density (ND) filter using silver halide photo film 은염 감광성 물질을 이용한 연속 neutral density(ND) 필터 제작 Article 3 한국광학회지 = Journal of the Optical Society of Korea - Korean Edition, v.11, no.4, pp.261 - 264 한국광학회지 = Journal of the Optical Society of Korea - Korean Edition 11 4 261 264 bandpass filter