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* To provide high quality optical solutions to customer requirements on time and at competitive prices.
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Neutral Density Filters - Metallic Type - UV-Grade - 25 mm Diameter

Knight Opticals' Metallic Neutral Density (ND) filters are comprised of a thin layer of nickel-chromium alloy, vacuum-deposited on a glass substrate and attenuate light through reflection. This gives outstanding neutrality and very accurate attenuation across the surface. These filters can also be used as beam splitters as half of the discarded light is absorbed and the rest reflected. The UV range of Metallic ND filters are on synthetic fused silica and extend the useful UV range down to about 170nm. The density of all our filters is specified at 550nm however in the UV it can be up to 40% higher. All of our filters are supplied with a transmittance scan taken from a filter on the same production run. The below listed filters are circular filters with a diameter of 25mm.   Specifications: Material: UV fused silica Optical Density : @550nm Diameter: +0.0 / -0.2 mm Length / width: ± 0.2 mm Thickness: ± 0.1 mm Surface quality: <60-40 scratch/dig   Options available >> Cutting down or edged to special shapes and sizes >> Mounting (25mm dia only) See Also: Neutral density filters - Glass type Neutral density filters - Gelatin type Knight Optical offer a complete set of 11 filters See product code: FNU0100 (below)

	Part No.	Coating	Size/dimensions (mm)	Density @550nm	Trans (%)	Diameter (mm)	Thickness (mm)	Material	Price (Ex.VAT)	Buy Now	Get Quote
	WHF2511	Uncoated				25	2	UV fused silica	£17.00	QTY:	Quote Me
	FNU0100		25 dia	SET OF 13 Filters	NA		NA	UV fused silica	£418.14	QTY:	Quote Me
	FNU00325		25dia	0.03*	93		2	UV fused silica	£17.00	QTY:	Quote Me
	FNU0125		25 dia	0.1 ±5%	79		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU0225		25 dia	0.2 ±5%	63		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU0325		25 dia	0.3 ±5%	50		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU0425		25 dia	0.4 ±5%	40		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU0525		25 dia	0.5 ±5%	32		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU0625		25 dia	0.6 ±5%	25		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU0725		25 dia	0.7 ±5%	19		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU0825		25 dia	0.8 ±5%	16		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU1025		25 dia	1.0 ±5%	10		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU1525		25 dia	1.5 ±5%	3.2		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU2025		25 dia	2.0 ±5%	1		2	UV fused silica	£37.30	QTY:	Quote Me
	FNU3025		25 dia	3.0 ±5%	0.1		2	UV fused silica	£37.30	QTY:	Quote Me