Filters
Absorptive Neutral Density Filters attain functions by absorbing light with minimal reflection. Holmarc’s absorptive neutral density filters are made by four special filter glass materials from Schott. Each schott filter glass material has a spectrally flat absorption coefficient in the visible region. Since optical density is a function of the type of glass material and thickness, by varying these we are able to produce the entire line of absorptive ND filters. Holmarc offers Absorptive ND filters in unmounted and mounted options. Optical density of the absorptive ND filter is related to the transmission by the following equation;
OD = log10 ( 1 / T ), or T = 10-OD
| Model No. | Diameter D ( mm ) |
Optical Density (OD) |
Material | Price | ||
| Unmounted | Mounted | Unmounted | Mounted | |||
| HO-NDA-12.5-0.1 | HO-NDA-12.5M-0.1 | 12.5 | 0.1 | NG11 | ||
| HO-NDA-12.5-0.2 | HO-NDA-12.5M-0.2 | 12.5 | 0.2 | NG11 | ||
| HO-NDA-12.5-0.3 | HO-NDA-12.5M-0.3 | 12.5 | 0.3 | NG11 | ||
| HO-NDA-12.5-0.4 | HO-NDA-12.5M-0.4 | 12.5 | 0.4 | NG4 | ||
| HO-NDA-12.5-0.5 | HO-NDA-12.5M-0.5 | 12.5 | 0.5 | NG4 | ||
| HO-NDA-12.5-0.6 | HO-NDA-12.5M-0.6 | 12.5 | 0.6 | NG4 | ||
| HO-NDA-12.5-1.0 | HO-NDA-12.5M-1.0 | 12.5 | 1.0 | NG4 | ||
| HO-NDA-12.5-1.3 | HO-NDA-12.5M-1.3 | 12.5 | 1.3 | NG4 | ||
| HO-NDA-12.5-2.0 | HO-NDA-12.5M-2.0 | 12.5 | 2.0 | NG9 | ||
| HO-NDA-12.5-3.0 | HO-NDA-12.5M-3.0 | 12.5 | 3.0 | NG9 | ||
| HO-NDA-12.5-4.0 | HO-NDA-12.5M-4.0 | 12.5 | 4.0 | NG9 | ||
| HO-NDA-12.5-5.0 | HO-NDA-12.5M-5.0 | 12.5 | 5.0 | NG9 | ||
| HO-NDA-12.5-6.0 | HO-NDA-12.5M-6.0 | 12.5 | 6.0 | NG1 | ||
| HO-NDA-25-0.1 | HO-NDA-25M-0.1 | 25 | 0.1 | NG11 | ||
| HO-NDA-25-0.2 | HO-NDA-25M-0.2 | 25 | 0.2 | NG11 | ||
| HO-NDA-25-0.3 | HO-NDA-25M-0.3 | 25 | 0.3 | NG4 | ||
| HO-NDA-25-0.4 | HO-NDA-25M-0.4 | 25 | 0.4 | NG4 | ||
| HO-NDA-25-0.5 | HO-NDA-25M-0.5 | 25 | 0.5 | NG4 | ||
| HO-NDA-25-0.6 | HO-NDA-25M-0.6 | 25 | 0.6 | NG4 | ||
| HO-NDA-25-1.0 | HO-NDA-25M-1.0 | 25 | 1.0 | NG4 | ||
| HO-NDA-25-1.3 | HO-NDA-25M-1.3 | 25 | 1.3 | NG4 | ||
| HO-NDA-25-2.0 | HO-NDA-25M-2.0 | 25 | 2.0 | NG9 | ||
| HO-NDA-25-3.0 | HO-NDA-25M-3.0 | 25 | 3.0 | NG9 | ||
| HO-NDA-25-4.0 | HO-NDA-25M-4.0 | 25 | 4.0 | NG9 | ||
| HO-NDA-25-5.0 | HO-NDA-25M-5.0 | 25 | 5.0 | NG9 | ||
| HO-NDA-25-6.0 | HO-NDA-25M-6.0 | 25 | 6.0 | NG1 | ||
Established in 1993, Holmarc Opto-Mechatronics Ltd manufactures variety of scientific and engineering instruments for research, industry and education.
ISO 9001:2015 Made in INDIA
CIN : L33125KL1993PLC006984
GST No : 32AAACH9492C1ZQ
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B.7., H.M.T. Industrial Estate
H.M.T. P.O, Kalamassery, Kochi
Kerala, India - 683 503
+91 920-719-7772 / 6 / 1
sales@holmarc.com
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