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Neutral Density Step Filters and
Circular Variable ND Coatings

The founder of Spectrum Optical Sources, Inc. has been manufacturing neutral density step filters and circular variable ND coatings for over twenty years. Creating and supplying circular and linear variable ND filters, circular and linear stepped ND filters and ND filter sets for the four major companies in the industry that offer these optical components in each of their catalogs.
Spectrum Optical Sources, Inc. has BK7 substrates to coat an ND filter to your specification or choose one of the filters Spectrum Optical Sources, Inc. has in stock for next day shipping.
  1. LENSES
  2. MIRRORS
  3. WINDOWS
Circular ND Step Filter

Choose between 50mm / 100mm diameter substrates

 

  6 Step Filter   8 Step Filter   12 Step Filter

 

Part # Density Values at 550nm w/ data Price
CNDS-6-A 0.4 / 0.2 / 0.4 / 0.6 / 0.8 / 1.0 $ 625.00
CNDS-6-B 0.4 / 0.4 / 0.8 / 1.2 / 1.6 / 2.0 $ 625.00
CNDS-8-A 0.4 / 0.1 / 0.2 / 0.3 / 0.4 / 0.5 / 0.6 / 1.0 $ 625.00
CNDS-8-B 0.4 / 0.2 / 0.4 / 0.6 / 0.8 / 1.0 / 2.0 / 3.0 $ 625.00
CNDS-12-A 0.4 / 0.1 / 0.2 / 0.3 / 0.4 / 0.5 / 0.6 / 0.7 / 0.8 / 1.0 / 2.0 / 3.0 $ 725.00
 

Circular ND Post Mount Assembly

 

Part # Price
#CND-PMA* (includes 2" post holder with thumbscrew and 1/2" Dia. x 2" length post**) $ 100.00
 

*   Filter not included

**  Additional size post holders/posts available

 

Linear ND Step Filter

 

6 Steps Filter   11 Steps Filter

 

Part # Density Value at 550nm w / data Price
LNDS-10-A 0.4 / 0.3 / 0.6 / 0.8 / 1.0 / 2.0 $ 350.00
LNDS-10-B 0.4 / 0.1 / 0.2 / 0.3 / 0.4 / 0.5 / 0.8 / 1.0 / 2.0 / 3.0 / 4.0 $ 415.00
LNDS-25-C 0.4 / 0.3 / 0.6 / 0.8 / 1.0 / 2.0 $ 360.00
LNDS-25-D 0.4 / 0.1 / 0.2 / 0.3 / 0.4 / 0.5 / 0.8 / 1.0 / 2.0 / 3.0 / 4.0 $ 425.00
 
   Size of: 10mm x 50mm [-A] 4.5mm clear w / 9mm steps
[-B] 4.5mm steps

25mm x 100mm [-C] 9mm clear w / 18mm steps
[-D] 9mm steps
Variable Circular ND Filter

 

  Variable Circular Neutral Density Filter  

 

Part # Density Value at 550nm w / data Price
VCNDF-25-2 2.0 $ 150.00
VCNDF-50-2 2.0 $ 150.00
VCNDF-100-2 2.0 $ 150.00
VCNDF-25-4 4.0 $ 200.00
VCNDF-50-4 4.0 $ 200.00
VCNDF-100-4 4.0 $ 200.00
 
    

Circular ND Post Mount Assembly

 

Part # Price
#CND-PMA* (includes 2" post holder with thumbscrew and 1/2" Dia. x 2" length post**) $ 100.00
 

*   Filter not included

**  Additional size post holders/posts available

 

ND Filter

 

  ND Filters

 
BK7 Substrate Specifications  
 
  Circular Window Substrates   Linear Window Substrates   Fixed ND Substrates
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