This Chroma filter is in excellent condition. It has the following characteristics:

� Diameter = 25mm
� Thickness = 6mm
� No mounting cell
� Filter type – interference dichroic
� Part number – Z442RDC

This is a long pass dichroic with the beam-split at 450nm (measured). There does not appear to be any transmission beneath 450nm in the visible region of the spectrum.

Transmission characteristics are measured with the filter mounted at 45 degrees to the optic axis. The reflection characteristics are complementary to the transmission characteristics.

Photo set 1203.

BMI Surplus, Inc. is your #1 resource for new, pre-owned &
refurbished optical equipment, optical tables, laser tables, legs and bases. We
will work with you individually to find the perfect set up, for
your application.
Buy online or give us a call at 781-871-8868. We’re here ready
to help you!
**Shipping & Freight fees are dependent on your location. We
will provide a freight quote to meet your individual needs and
work with you if you prefer to use your own carrier. We have 30
years of shipping sensitive scientific & industrial equipment.
We ship with the utmost care!

***MPN Z442RDC 25mm
***OEM Chroma
***SKU*** 18497

Dichroic Long-Pass Filter 540nm (sm peak 420-460nm) 25mm diam

This filter is in excellent condition. It has the following characteristics:

� Diameter = 25mm
� Thickness = 7.8mm
� No mounting cell
� Filter type – interference dichroic
� Part number – G2500-23012-1 (Rev. B)

This is a long pass dichroic with the beam-split at 540nm (measured). There is also a greatly attenuated pass region between 420 and 460nm.

Transmission characteristics are measured with the filter mounted at 45 degrees to the optic axis. The reflection characteristics are complementary to the transmission characteristics. ..

Photo set 1202 .

BMI Surplus, Inc. is your #1 resource for new, pre-owned &
refurbished optical equipment, optical tables, laser tables, legs and bases. We
will work with you individually to find the perfect set up, for
your application.
Buy online or give us a call at 781-871-8868. We’re here ready
to help you!
**Shipping & Freight fees are dependent on your location. We
will provide a freight quote to meet your individual needs and
work with you if you prefer to use your own carrier. We have 30
years of shipping sensitive scientific & industrial equipment.
We ship with the utmost care!!
***MPN G2500-23012-1
***OEM Custom
***SKU*** 18496

Chroma Dichroic Filter Long Pass 485nm 25mm diameter.

This Chroma filter is in excellent condition.. It has the following characteristics:

� Diameter = 25mm
� Thickness = 6mm
� No mounting cell
� Filter type – interference dichroic
� Part number – unknown

This is a long pass dichroic with the beam-split at 483nm (measured). There is also a greatly attenuated pass region between 425 and 470nm.

Transmission characteristics are measured with the filter mounted at 45 degrees to the optic axis. The reflection characteristics are complementary to the transmission characteristics..

BMI Surplus, Inc. is your #1 resource for new, pre-owned &
refurbished optical equipment, optical tables, laser tables, legs and bases. We
will work with you individually to find the perfect set up, for
your application.
Buy online or give us a call at 781-871-8868. We’re here ready
to help you!
**Shipping & Freight fees are dependent on your location. We
will provide a freight quote to meet your individual needs and
work with you if you prefer to use your own carrier. We have 30
years of shipping sensitive scientific & industrial equipment.
We ship with the utmost care!!
***MPN Unknown
***OEM Chroma
***SKU*** 18495

This Chroma filter is in decent condition, having been removed from some prototype equipment. It has the following characteristics:

� Dimensions = 25mm x 18mm
� Thickness = 3mm
� No mounting cell
� Filter type – interference dichroic
� Part number – 625DCXR

The filter appears to be dual-excitation dichroic. The wavelength characteristics are rather complicated. There is a sharp band stop region that extends from 460nm to 600nm, with transmission lines at 554 and 567nm

Transmission characteristics are measured with the filter mounted at 45 degrees to the optic axis. The reflection characteristics are complementary to the transmission characteristics. The edges of the filter may have a bit of the coating missing (photo is typical), but the central region of the filter is excellent.

***MPN 625DCXR 18×25
***OEM Chroma
***SKU*** 18492

Chroma Dichroic Band Stop 460 – 600nm lines at 554 and 567nm.
This Chroma filter is in very good condition, having been removed from some prototype equipment. It has the following characteristics:

� Diameter = 25mm
� Thickness = 2mm
� No mounting cell
� Filter type – interference dichroic
� Part number – 625DCXR

The filter appears to be dual-excitation dichroic. The wavelength characteristics are rather complicated. There is a sharp band stop region that extends from 460nm to 600nm, with transmission lines at 554 and 567nm.

Transmission characteristics are measured with the filter mounted at 45 degrees to the optic axis. The reflection characteristics are complementary to the transmission characteristics. The surface of the filter may have a very fine void or two, but the ‘mottled’ appearance in the photo is actually a reflection artifact – the filter coating is very even.

Photo set 1197.

BMI Surplus, Inc. is your #1 resource for new, pre-owned &
refurbished optical equipment, optical tables, laser tables, legs and bases. We
will work with you individually to find the perfect set up, for
your application.
Buy online or give us a call at 781-871-8868. We’re here ready
to help you!
**Shipping & Freight fees are dependent on your location. We
will provide a freight quote to meet your individual needs and
work with you if you prefer to use your own carrier. We have 30
years of shipping sensitive scientific & industrial equipment.
We ship with the utmost care!

***MPN 625DCXR 25mm
***OEM Chroma
***SKU*** 18491

Chroma Dichroic Filter Band Stop 490 ? 525nm.

This Chroma filter, in excellent condition, has the following characteristics:

� Diameter = 25mm
� Thickness = 3mm
� Free aperture = 23mm
� No mounting cell
� Filter type – interference, with high-Q stop band

Bandpass characteristics were measured with the filter at 45 degrees to optic axis. This filter appears to block the spectral region between 490nm and 525nm. Reflected color in photo appears ‘wrong’ because it was taken normal to optic axis. If needed, I can measure characteristics at normal to optic axis.

Photo set 1196.

BMI Surplus, Inc. has a huge inventory of used, new and pre-owned Optical Windows and Flats for sale.
We will work with you individually to find the perfect set up for your application.

Buy online or give us a call at 781-871-8868. We have experienced customer service representatives standing by ready to help you!

BMI Surplus, Inc. is a dealer in used and sometimes new Surplus Scientific and Industrial Equipment – we cater to clients in search of items to be used for specific applications.
We do not offer a guarantee as many of our items are purchased by professionals in need of parts and pieces.
You will find many of our items listed on our website as untested or as parts or repair units even though in they are in good used condition.

**Shipping, Handling and Freight fees are dependent on your location.
We will provide a freight quote to meet your individual needs and work with you if you prefer to use your own carrier.
We have 32 years of experience shipping sensitive scientific instruments and industrial equipment!

Don’t see what you are looking for? Use our orange search box on the top right hand corner of this page to customize your search.
***MPN Unknown
***OEM Chroma
***SKU*** 18490

Aperture Turret in Centerable Mount..

This is a precision pinhole diaphragm turret complete with centerable mount and nine graded pinholes (lettered �A� through �H�) and one square aperture, lettered �J�. The size of the pinholes appears to range from approximately 1.75mm to 1.5mm. The square aperture is approximately 0.3mm on a side. All of these are very rough measurments.

Centration of the turret is accomplished via two Mitutoyo micrometer spindles reading to 0.01mm
Centration range is plus or minus 3mm
50mm diameter dovetail mounting flanges on both sides
Distance between outer flange faces is 32mm
Overall diameter of the black housing is 72mm

The apparatus is in very fine condition. The pinholes do not have any blemishes. The square aperture corners do appear to be slightly rounded. This is obviously a commercially made product but we were unable to discover who manufactured it.

Location MB 141.

Photo set 987.

BMI Surplus, Inc. is your #1 resource for new, pre-owned,
recycled, refurbished & used optics, optical tables, laser
tables, vibration isolation systems, legs and bases & optical support & optical accessories.
We will work with you individually to find the perfect set up for your application. Shop our Optical Tables for the most competitive optical table price.
Buy online or give us a call at 781-871-8868. We’re here ready
to help you!
**Shipping & Freight fees are dependent on your location. We
will provide a freight quote to meet your individual needs and
work with you if you prefer to use your own carrier. We have 30
years of shipping sensitive scientific instruments & industrial
equipment
We ship with the utmost care!
***MPN
***OEM Custom
***SKU*** DP540

This is a metal film graduated neutral density filter on a circular glass substrate 152mm in diameter. The central bore for the hub is 24mm in diameter. The effective filter area is 60mm wide (extending from 14mm to 74mm radius). The clear diameter of the hub is 26mm. Thickness of the glass is 3mm. The filter is deposited on the surface (no cover glass).

The filter is in fair condition � the metalized film coating appears quite �blotchy� and uneven. The substrate appears to be in excellent condition, however. There is no calibration information with the filter, nor do we know who the manufacturer is. The density appears to become quite great rather quickly. I am not sure what the density curve is supposed to be, or what angle of arc it subtends.

Please see the first photo for indication of coating problems � the line across the bottom of the filter is a reflection, but the mottled appearance is in fact the way it appears.

***MPN
***OEM Custom
***SKU*** DP450

This is a very nice selection of Ealing neutral density filters. All the filters are 50mm in diameter, five of which have plastic cells. Clear aperture of the filters within the cells is 40mm. The filters appear to have a quartz substrate (they are very light, and Ealing typically used quartz for their reflective neutral density filters). Two filters do not have the plastic rings, nor is their any indication of transmission directly on the filters, however there are labels in the cabinet that match the transmission characteristics observed in the filters.

The list of filters includes
ND 0.1 � no cell, reflective type
ND 0.3 � in Ealing Cell, reflective type
ND 0.6 � in Ealing Cell, reflective type
ND 1.0 � in Ealing Cell, reflective type
ND 2.0 � in Ealing Cell, reflective type
ND 3.0 � in Ealing Cell, reflective type
ND 4.0 � no cell, reflective type, sandwiched

All of the filters are in perfect condition with the exception of the ND 3.0, which appears to have several microscopic pin-holes. There is also a darkish blemish on the surface of the filter (visible in the third photo), but this does not seem to show up in transmitted light. The filters are supplied in a nice fitted walnut cabinet with elastic retaining bands. There are no transmission curves for any of the filters.

BMI Surplus, Inc. is your #1 resource for new, pre-owned &
refurbished optical equipment, optical tables, laser tables, legs and bases. We
will work with you individually to find the perfect set up, for
your application.
Buy online or give us a call at 781-871-8868. We’re here ready
to help you!
**Shipping & Freight fees are dependent on your location. We
will provide a freight quote to meet your individual needs and
work with you if you prefer to use your own carrier. We have 30
years of shipping sensitive scientific & industrial equipment.
We ship with the utmost care!!

***MPN
***OEM Ealing / Beck
***SKU*** DP372

Baird-Atomic Bandpass Optical Filter 25mm

***MPN
***OEM Baird-Atomic
***SKU*** 64604

Melles Griot 04-PPM-016 Pinholes – LOT OF 3

150 Micron
100 Micron
10 Micron
***MPN 04-PPM-016
***OEM Melles Griot
***SKU*** 63284