Chengdu Yafei Optical Instrument Factory
Chengdu Yafei Optical Instrument Factory YOPHY stays with beauty and time.
Add to Cart
67mm 77mm 72mm 77mm adjustable filter HD carea lens filter for Scenery Photography
67 / 72 / 77mm Camera Lens Filters , Adjustable ND Filter For Scenery Photography
parameters of VND
| ND No. | lens area opening | optical density | f-stop reduction | fractional transmittance |
| ND2 | 1/2 | 0.3 | 1 | 50% |
| ND4 | 1/4 | 0.6 | 2 | 25% |
| ND8 | 1/8 | 0.9 | 3 | 12.5% |
| ND16 | 1/16 | 1.2 | 4 | 6.25% |
| ND32 | 1/32 | 1.5 | 5 | 3.125% |
