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Edgepass Filters: Longpass and Shortpass


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Edgepass Filters: Longpass and Shortpass

Edgepass Filter Drawing
 Longpass FiltersShortpass
Filters
Transmission RegionCut-on λ to 2200 nm (Min)0.7λ to Cut-off λ (Unless 0.7λ is < 400 nm, then 400 nm to Cut-off λ)
Rejection Region200 nm to Cut-on λ1.3 times Cut-off λ

Features

  • Emission Filters in Fluorescence Applications
  • Order Sorting Filters for Photometry
  • Stray Light or Trim Filters to Eliminate any Unwanted Near-Band Radiation
  • Raman Spectroscopy Filters
  • Astronomy Applications

Thorlabs' longpass and shortpass filters are very useful for isolating regions of a spectrum. These edgepass filters feature durable dielectric coatings that withstand the normal cleaning and handling necessary when using any high-quality optical component. Their film construction is essentially a modified quarter-wave stack, using interference effects rather than absorption, to isolate their spectral bands (see the Specs tab for transmission information).

Unlike colored filter glass, the cut-on and cut-off wavelength of these filters will shift to a shorter wavelength as the angle of incidence is increased. As a rule of thumb, when the angle of incidence goes from 0° to 45°, the central wavlength shifts down by about 10%. This feature can be useful in applications where it is desirable to fine tune the location of the cut-on, or cut-off wavelength. In addition, our edgepass filters are hermetically sealed to provide maximum humidity protection, and they can be stacked to create a custom bandpass filter.

Webpage Feature
 info iconClicking on this symbol in the tables below will open a window showing transmission and optical density data for the corresponding filter.

We do not recommend removing the filter from its mount, as the filter consists of several layers of glass that are held together with epoxy and the mounting ring. These glass layers are necessary to protect the dielectric coating from the atmosphere; exposure would significantly reduce the filter's transmission efficiency over time.

These longpass and shortpass filters are also available in kits. To request a quote for custom edgepass filters, please contact Tech Support. For applications with demanding wavefront requirements, such as imaging, please consider our premium edgepass filters.

 Longpass FiltersShortpass Filters
Transmission RegionCut-on λ to 2200 nm Mininmum0.7λ to Cut-off λ (Unless 0.7λ is < 400 nm, Then 400 nm to Cut-off λ)
Transmission at Peak*400-700 nm, 80%
750-1000 nm, 75%
>1000 nm, 70%
550-1000 nm, 80%
<550 nm, 70%
Cut-On or Cut-Off Tolerance
(Δλ @ 50% of Peak)
±3 nm (400 to 750 nm)
±15 nm (800 to 1500 nm)
±3 nm (450 to 750 nm)
±15 nm (800 to 1000 nm)
Rejection Region200 nm to Cut-On1.3 Times Cut-Off
Transmission in Rejection Region0.01% abs. (OD = 4.0)0.01% abs., 0.0001% avg. (OD = 4.0-6.0)
Cut-off Slope3%, OD = 0.3 to OD = 44-5%, OD = 0.3 to OD = 4
ConstructionImmersed DielectricImmersed Dielectric
Surface Quality (Scratch-Dig)80/50 per Mil-0-13830A80/50 per Mil-0-13830A
Substrate MaterialSoda Lime or EquivalentSoda Lime or Equivalent

*For FEL0400, the Transmission at Peak from 450-2200 nm is 70%; for FEL0450, the Transmission at Peak from 400-2200 nm is 70%.

Optical Density Equation:
Optical Density Equation

Bandpas Filter Layers
Click to Enlarge
The number of layers shown in this schematic is not indicative of the number of layers in an actual bandpass filter. Also the drawing is not to scale.

Bandpass/Edgepass Filter Structure

A bandpass or edgepass filter is created by depositing layers of material on the surface of the substrate. Typically, there are several dielectric stacks separated by spacer layers. The dielectric stack is composed of a large number of alternating layers of low-index and high-index dielectric material. The thickness of each layer in the dielectric stack is λ/4, where λ is the central wavelength of the bandpass filter (i.e. the wavelength with the highest transmittance through the filter). The spacer layers are placed in between the dielectric stacks and have a thickness of (nλ)/2, where n is an integer. The spacer layers can be formed from colored glass, epoxy, dyes, metallic, or dielectric layers. A Fabry-Perot cavity is formed by each spacer layer sandwiched between dielectric stacks. The filter is mounted in an engraved metal ring for protection and ease of handling.

Filter Operation Overview

The constructive interference conditions of a Fabry-Perot cavity allow light at the central wavelength, and a small band of wavelengths to either side, to be transmitted efficiently, while destructive interference prevents the light outside the passband from being transmitted. However, the band of blocked wavelengths on either side of the central wavelength is small. In order increase the blocking range of the filter, materials with broad blocking ranges are used for or coated onto the spacer layers and the substrate. Although these materials effectively block out of band transmission of incident radiation they also decrease the transmission through the filter in the passband.

bandpass filter, forward versus backward transmission
FB800-10 and FB800-40 filters were used to make the measurement that resulted in the plot above.

Filter Orientation

An engraved arrow on the edge of the filter is used to indicate the recommended direction for the transmission of light through the filter. Although the filter will function with either side facing the source, it is better to place the coated side toward the source. This will minimize any thermal effects or possible thermal damage that blocking intense out-of-band radiation might cause due to the absorption of the out-of-band radiation by the substrate or colored glass filter layers. The plot to the right was made by illuminating the filter with a low intensity broadband light and measuring the transmission as a function of wavelength. The plot shows that the transmission direction through the filter has very little effect on the intensity and the spectrum of the light transmitted through the filter. The minimal variation between the forward and backward traces is most likely due to a small shift in the incident angle of the light on the filter introduced when the filter was removed, flipped over, and replaced in the jig.

The filter is intended to be used with collimated light normally incident on the surface of the filter. For uncollimated light or light striking the surface and an angle not normally incident to the surface the central wavelength (wavelength corresponding to peak transmission) will shift toward lower wavelengths and the shape of the transmission region (passband) will change. As a rule of thumb, when the angle of incidence goes from 0° to 45°, the central wavlength shifts down by about 10%. This feature can be useful in applications where it is desirable to fine tune the location of the cut-on, or cut-off wavelength.

Filter Temperature

The central wavelength of the bandpass filter can be tuned slightly (~1 nm over the operating range of the filter) by changing the temperature of the filter. This is primarily due to the slight thermal expansion or contraction of the layers.

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Posted Comments:
Poster: besembeson
Posted Date: 2014-08-07 03:53:02.0
Response from Bweh E at Thorlabs: These would not be a great choice for short pulse systems. The base material for these filters is Soda Lime which is an economy grade material. Because of the potential for high power with the short pulses the premium edge pass filters would be a better choice. These can be found at the following link: http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1860.
Poster: pallysally
Posted Date: 2014-08-01 00:00:43.8
can these filters be used for femtosecond laser?
Poster: besembeson
Posted Date: 2014-07-23 09:10:46.0
A response from Bweh at Thorlabs USA: Hello, we certainly can provide smaller sizes for this filter. I will follow up by email to get your special requirements.
Poster: ben
Posted Date: 2014-07-18 12:43:11.72
Does this filter come in smaller sizes?
Poster: besembeson
Posted Date: 2014-05-21 12:03:55.0
This is a response from Bweh Esembeson at Thorlabs: Thanks for your inquiry. This filter doesn't transmit in the 4-5 micron range. The blocking optical density will be at least 2.
Poster: hussain
Posted Date: 2014-05-20 04:47:27.983
Would you pls tell me the transmission of FEL1200 from 4-5µm.
Poster: jlow
Posted Date: 2014-01-29 03:58:49.0
Response from Jeremy at Thorlabs: The effective refractive index is generally used to estimate the central wavelength shift for angle tuning. It seems that you are looking to achieve a certain cut-off wavelength that we do not carry. We can do a transmission scan for you at different angles for a specific filter. I will get in contact with you to arrange this.
Poster: tuomas
Posted Date: 2014-01-08 07:14:44.71
What is the effective refractive index of your filters? I.e. the quantity N_e discussed in http://www.irf.se/~urban/avh/html/node17.html
Poster: guoqiang.xia
Posted Date: 2013-03-04 01:43:47.503
The is a follow up on the previous question. The following data are a short section of transmission data of FEL0800, there are negative values, please verify your measurements. Thanks! 706 1.97E-05 705 -1.06E-06 704 5.04E-06 703 -4.71E-07 702 8.78E-06 701 1.32E-06 700 -4.57E-06
Poster: guoqiang.xia
Posted Date: 2013-02-27 01:15:11.893
About transmition data on your website, why are there negative values? Especially in the rejected region, since we are very concerned with the performance in the rejected region, so please clarify that at the OD 6-8 region, your measurements are not noise plagued.
Poster: sharrell
Posted Date: 2012-06-20 10:17:00.0
Response from Sean at Thorlabs: Thank you for your feedback on our longpass filters page. I am sorry that the filter was not available for purchase on the page, we have corrected the error and it is now available for purchase. The plot on the page has also been updated.
Poster: m.c.ashby
Posted Date: 2012-06-20 08:00:13.0
is the FEL0600 filter available? It is not on the list of order numbers and data shown is for FLE0650.
Poster: bdada
Posted Date: 2012-01-10 12:22:00.0
Response from Buki at Thorlabs: As a guideline, the power density should no more than 1W/cm2 for CW and 0.15J/cm2 (10ns, 532nm, .508mm) for pulsed lasers. The filter will not be able to withstand 1kW/cm^2. Please contact TechSupport@thorlabs.com if you have further questions.
Poster: sven
Posted Date: 2012-01-09 15:14:42.0
Is there any LIDT data for these filters? In my special case: Are the FEL0450/FES0500 filters able to withstand ~1kW/cm² cw?
Poster: bdada
Posted Date: 2011-12-26 12:10:00.0
Response from Buki at Thorlabs: Thank you for your feedback. The direction of the incident light does matter. Please refer to the excerpt from the "Tutorial" tab on the website. We will look into how to make this information clearer in our packaging and on our website. Please contact TechSupport@thorlabs.com if you have any questions. "An engraved arrow on the edge of the filter is used to indicate the recommended direction for the transmission of light through the filter. Although the filter will function with either side facing the source, it is better to place the coated side toward the source. This will minimize any thermal effects or possible thermal damage that blocking intense out-of-band radiation might cause due to the absorption of the out-of-band radiation by the substrate or colored glass filter layers."
Poster:
Posted Date: 2011-12-22 17:52:19.0
Does the direction of the incident light matter, there seems to be an arrow on the outer edge of the filter, but nothing is said in the presentation or on the packaging.
Poster: jjurado
Posted Date: 2011-08-31 18:35:00.0
Response from Javier at Thorlabs to smuehlen: Dielectric coated filters such as our short and long pass filters do not affect the polarization state of the incident beam. However, at angles of incidence greater than 0°, the parallel (p) and perpendicular (s) polarization components of light are filtered differently. This effect, which includes changes in the transmission profile and a shortening in the cut-on wavelength, become more pronounced as the angle of incidence increases. I will contact you directly with more information.
Poster: smuehlen
Posted Date: 2011-08-30 11:23:15.0
Do the filters have any influence on the polarization of the transmitted beam?
Poster: bdada
Posted Date: 2011-04-15 16:55:00.0
Response from Buki at Thorlabs: As a guideline, the power density should no more than 1W/cm2 for CW and 0.15J/cm2 (10ns, 532nm, .508mm) for pulsed lasers. Note that the amount of energy in the transmitting region and the blocking region should be considered. For example, the amount of energy the FEL1000 filter is subjected to at 1200nm (transmitted) will be more than the amount of energy it is subjected to at 800nm (absorbed). Please contact TechSupport@thorlabs.com if you have further questions.
Poster: jmod1g09
Posted Date: 2011-04-15 16:15:20.0
Hello, What is the maximum out of band (rejected/reflected) power density permited before damage?
Poster: jjurado
Posted Date: 2011-04-14 13:56:00.0
Response from Javier at Thorlabs to David de Castro Alves: Thank you very much for submitting your request. If the purpose of your application is to block the transmission of light at the harmonic wavelength and pass light at the fundamental wavelength, then the FEL0700 longpass filter would work, with a transmission of ~81% at 1232 nm. Alternatively, you can use a shortpass dichroic mirror such as our DMSP1000, which has reflection band of 1020-1550 nm with (Ravg > 90%) and a transmission band of 520-985 nm (Tavg > 90%). Here is the link for this mirror: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=3313&pn=DMSP1000 I will contact you directly for further support.
Poster: dmvalves
Posted Date: 2011-04-14 16:20:36.0
Hi, I need to remove the following wavelength 1232nm from is second harmonic 616nm. In the filter datasheet there are no information about the 1232nm transmission. It is possible to tell me the transmission to the fundamental wavelength (1232nm)? Best regards, David de Castro Alves
Poster: jjurado
Posted Date: 2011-02-07 09:56:00.0
Response from Javier at Thorlabs to Pramod: Thank you very much for contacting us with your request. We are currently in the process of adding raw data for most of our optics products as a standard across our entire website. This includes all of our interference filters. In the meantime, please contact our Technical Support department at techsupport@thorlabs.com so that we can send you these files directly. We can also provide these filter unmounted.
Poster:
Posted Date: 2011-02-04 18:38:25.0
I will greatly appreciate transmission data for FEL1050, FEL1100, FEL1150, FEL1200, FEL1250, FEL1300, FEL1350, FEL1400, FEL1450, and FEL1500 in the range 900nm to 1800nm. I already have these filters, and would like to have another set without mounts. Pramod
Poster: pkkhulbe
Posted Date: 2011-02-04 18:37:33.0
I will greatly appreciate transmission data for FEL1050, FEL1100, FEL1150, FEL1200, FEL1250, FEL1300, FEL1350, FEL1400, FEL1450, and FEL1500 in the range 900nm to 1800nm. I already have these filters Pramod
Poster: Thorlabs
Posted Date: 2010-11-05 09:52:08.0
Response from Javier at Thorlabs to Tristan: I will send you this information shortly.
Poster: tristan.deborde
Posted Date: 2010-11-05 01:43:16.0
Can I please get transmission data on the FEL1000 for a wavelength range going from 400 to 2000 nm?
Poster: Thorlabs
Posted Date: 2010-10-27 16:12:16.0
Response from Javier at Thorlabs to Tristan: I will contact you directly with this information.
Poster: tristan.deborde
Posted Date: 2010-10-26 23:19:27.0
Do you have more Transmission data for the FES1000 and FEL1000. Im interested in about 450 nm up to posted graph for FES1000 and out to 2000 nm for FEL1000 if possible?
Poster: Thorlabs
Posted Date: 2010-10-15 18:13:40.0
Response from Javier at Thorlabs to Angela: I will contact you directly with a quotation for this filter.
Poster: angelakyea
Posted Date: 2010-10-15 10:41:50.0
I want to purchase two of the FEL0400 long pass filter, What is the cost of both the product price and the shipping price? And how is the payment done please?
Poster: Thorlabs
Posted Date: 2010-09-08 16:32:24.0
Response from Javier at Thorlabs to bmangum: I will send you an Excel file with typical data for the transmission and optical density of the FEL0450 filter.
Poster: bmangum
Posted Date: 2010-09-08 13:36:23.0
I have an FEL0450. Is there a way of getting the ascii data? Also it is more helpful to have a plot of the optical density vs wavelength compared to % transmission.
Poster: Thorlabs
Posted Date: 2010-07-09 17:46:27.0
Response from Javier at Thorlabs to wwu: thank you for your feedback. As a general guideline, the central wavelength of the filter will shift to a lower wavelength by about 10% as you rotate the filter form 0 to 45 degrees. For the FEL0800, this translates into a total shift of ~80 nm. Also, the tranmission percentage decreases and the profile of the passband changes slightly.
Poster: wwu
Posted Date: 2010-07-09 15:21:58.0
What is the expected wavelength shift in cut-off frequency when one rotates the filter? Single nm? or tens of nm? My interest is specfically in the FEL0800 filter.
Poster: Adam
Posted Date: 2010-05-14 08:21:35.0
A response from Adam at Thorlabs to to vkhopov: As you rotate the filter from normal incidence, the cut off frequency will shift to lower wavelengths and broaden out.
Poster: Adam
Posted Date: 2010-05-14 08:17:17.0
A response from Adam at Thorlabs to xshen: We are inspecting the FEL1100 today. We will measure the transmission at 2100nm and send you the data.
Poster: xshen
Posted Date: 2010-05-12 18:02:26.0
Hello, we just have some quesitons about the longpass 1100 nm filters. We found that there is a big dip (almost cutoff) at the wavelength around 2100 nm. Would you please send me the transmission data from 1100 - 2200 nm?
Poster: klee
Posted Date: 2009-11-30 17:00:45.0
A response from Ken at Thorlabs to physics_nt: The "V" is indeed an indicator for the beam direction. It points with the laser.
Poster: physics_nt
Posted Date: 2009-11-30 16:46:17.0
I notice a V on the side of these is that an indicator of laser propagation direction? Should it point against the laser or with the laser or is this just a part number?
Poster: Tyler
Posted Date: 2008-11-26 14:14:24.0
A response from Tyler at Thorlabs to dasfda: We are always working toward improving the quality and type of content available to our customers through the web, so thank you for your suggestion. Our web development team and our optics quality control department are working on a method of providing all of the lot specific transmission measurements made directly to the customer via the our website. Although this functionality is not currently ready to release yet, we can send you via email the transmission data and plots for any of the filters that you are interested in. To receive this information, just email our tech support department with a list of filters (include the lot number engraved on the filter mount if available).
Poster: dasfda
Posted Date: 2008-11-26 12:07:24.0
Please give the transmission data in text or CSV format as well as the graphs. One file with the whole lot in would be very useful. Please include the full wavelength range (including the bits excluded from the graphs where the transmission is ~0). Graphs in db would also be useful. 25mm mounts (not 1") would be lovely.
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Longpass Filters
Item # Cut-On Wavelength (nm) Transmission Dataa
FEL0400 400 info
FEL0450 450 info
FEL0500 500 info
FEL0550 550 info
FEL0600 600 info
FEL0650 650 info
FEL0700 700 info
FEL0750 750 info
FEL0800 800 info
FEL0850 850 info
FEL0900 900 info
FEL0950 950 info
Item # Cut-On Wavelength (nm) Transmission Dataa
FEL1000 1000 info
FEL1050 1050 info
FEL1100 1100 info
FEL1150 1150 info
FEL1200 1200 info
FEL1250 1250 info
FEL1300 1300 info
FEL1350 1350 info
FEL1400 1400 info
FEL1450 1450 info
FEL1500 1500 info
  • The shaded regions in these graphs denote the spectral ranges over which we recommend using these filters. Please keep in mind that the data given is typical, and performance may vary from lot to lot, particularly outside of the shaded regions.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FEL0400 Support Documentation
FEL0400 Longpass Filter, Cut-On Wavelength: 400 nm
$73.00
Today
FEL0450 Support Documentation
FEL0450 Longpass Filter, Cut-On Wavelength: 450 nm
$73.00
Today
FEL0500 Support Documentation
FEL0500 Longpass Filter, Cut-On Wavelength: 500 nm
$73.00
Today
FEL0550 Support Documentation
FEL0550 Longpass Filter, Cut-On Wavelength: 550 nm
$73.00
Today
FEL0600 Support Documentation
FEL0600 Longpass Filter, Cut-On Wavelength: 600 nm
$73.00
Today
FEL0650 Support Documentation
FEL0650 Longpass Filter, Cut-On Wavelength: 650 nm
$73.00
Today
FEL0700 Support Documentation
FEL0700 Longpass Filter, Cut-On Wavelength: 700 nm
$73.00
Today
FEL0750 Support Documentation
FEL0750 Longpass Filter, Cut-On Wavelength: 750 nm
$73.00
Today
FEL0800 Support Documentation
FEL0800 Longpass Filter, Cut-On Wavelength: 800 nm
$73.00
Today
FEL0850 Support Documentation
FEL0850 Longpass Filter, Cut-On Wavelength: 850 nm
$73.00
Today
FEL0900 Support Documentation
FEL0900 Longpass Filter, Cut-On Wavelength: 900 nm
$73.00
Today
FEL0950 Support Documentation
FEL0950 Longpass Filter, Cut-On Wavelength: 950 nm
$73.00
Today
FEL1000 Support Documentation
FEL1000 Longpass Filter, Cut-On Wavelength: 1000 nm
$73.00
Today
FEL1050 Support Documentation
FEL1050 Longpass Filter, Cut-On Wavelength: 1050 nm
$73.00
Today
FEL1100 Support Documentation
FEL1100 Longpass Filter, Cut-On Wavelength: 1100 nm
$73.00
Today
FEL1150 Support Documentation
FEL1150 Longpass Filter, Cut-On Wavelength: 1150 nm
$73.00
Today
FEL1200 Support Documentation
FEL1200 Longpass Filter, Cut-On Wavelength: 1200 nm
$73.00
Today
FEL1250 Support Documentation
FEL1250 Longpass Filter, Cut-On Wavelength: 1250 nm
$73.00
Today
FEL1300 Support Documentation
FEL1300 Longpass Filter, Cut-On Wavelength: 1300 nm
$73.00
Today
FEL1350 Support Documentation
FEL1350 Longpass Filter, Cut-On Wavelength: 1350 nm
$73.00
Today
FEL1400 Support Documentation
FEL1400 Longpass Filter, Cut-On Wavelength: 1400 nm
$73.00
Today
FEL1450 Support Documentation
FEL1450 Longpass Filter, Cut-On Wavelength: 1450 nm
$73.00
Today
FEL1500 Support Documentation
FEL1500 Longpass Filter, Cut-On Wavelength: 1500 nm
$73.00
Today
Shortpass Filters
Item # Cut-Off Wavelength (nm) Transmission Dataa
FES0450 450 info
FES0500 500 info
FES0550 550 info
FES0600 600 info
FES0650 650 info
FES0700 700 info
Item # Cut-Off Wavelength (nm) Transmission Dataa
FES0750 750 info
FES0800 800 info
FES0850 850 info
FES0900 900 info
FES0950 950 info
FES1000 1000 info
  • The shaded regions in these graphs denote the spectral ranges over which we recommend using these filters. Please keep in mind that the data given is typical, and performance may vary from lot to lot, particularly outside of the shaded regions.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FES0450 Support Documentation
FES0450 Shortpass Filter, Cut-Off Wavelength: 450 nm
$73.00
Today
FES0500 Support Documentation
FES0500 Shortpass Filter, Cut-Off Wavelength: 500 nm
$73.00
Today
FES0550 Support Documentation
FES0550 Shortpass Filter, Cut-Off Wavelength: 550 nm
$73.00
Today
FES0600 Support Documentation
FES0600 Shortpass Filter, Cut-Off Wavelength: 600 nm
$73.00
Today
FES0650 Support Documentation
FES0650 Shortpass Filter, Cut-Off Wavelength: 650 nm
$73.00
Today
FES0700 Support Documentation
FES0700 Shortpass Filter, Cut-Off Wavelength: 700 nm
$73.00
Today
FES0750 Support Documentation
FES0750 Shortpass Filter, Cut-Off Wavelength: 750 nm
$73.00
Today
FES0800 Support Documentation
FES0800 Shortpass Filter, Cut-Off Wavelength: 800 nm
$73.00
Today
FES0850 Support Documentation
FES0850 Shortpass Filter, Cut-Off Wavelength: 850 nm
$73.00
Today
FES0900 Support Documentation
FES0900 Shortpass Filter, Cut-Off Wavelength: 900 nm
$73.00
Today
FES0950 Support Documentation
FES0950 Shortpass Filter, Cut-Off Wavelength: 950 nm
$73.00
Today
FES1000 Support Documentation
FES1000 Shortpass Filter, Cut-Off Wavelength: 1000 nm
$73.00
Today
Storage Box for Mounted Filters
  • Designed to Hold Ø25 mm Mounted ND Filters
  • Protects Optics from Dust and Scratches
  • Foam Inserts Separate Optics

The KT01 is designed to hold ten Ø25 mm mounted filters.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
KT01 Support Documentation
KT01 Storage Box for Mounted Ø1" (25 mm) Round Optics (Max. Capacity: 10)
$86.70
Today
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