• A graph showing the transmission of a bandpass filter with a central wavelength at 940nm and a bandwidth of 50nm, plotted against wavelength in nanometers on the x-axis and transmission on the y-axis.
  • Black bandpass filter with technical specifications on a white background
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BP940-50 Bandpass Filter(CWL=940nm,FWHM=50nm)

BP940-50 Bandpass Filter(CWL=940nm,FWHM=50nm)

PartNumber:SO3010724

$55.00 USD
$55.00 USD
Sale Sold out
Shipping calculated at checkout.

Center Wavelength (CWL)
Optical Density // Peak Transmission (Tpk)
Dimension

⚠ Designed for incidence ().

In Stock.

Ships within 5 working days of order. Customs handling including. (DDP)

Net 30 payment terms for organizational purchase orders.

Email shop@syronoptics.com For Customization Options

  • Wavelength: 940nm center wavelength with 50nm FWHM for near-infrared applications
  • Spectral Features: Precision bandpass transmission optimized for NIR spectroscopy, sensing, and imaging
  • Optical Density: OD3 blocking for superior out-of-band rejection and signal clarity
  • Filter Dimension Availability: Multiple sizes available to fit your optical system requirements

Request Raw Data

You can request the raw transmission data from us.

Copy the link of the product page and send email to shop@syronoptics.com, you will get reply within 1 working days.

Shipment & Delivery

  • Stocked products ship within 5 business days after order confirmation.
  • Custom-made products typically ship within 4–8 weeks.
  • Delivery times may be affected by holidays, customs clearance, or other unforeseen events.
  • Tracking information becomes available 3–5 days after dispatch when the parcel is handed to the local courier.
  • Some deliveries may require customer pickup. Please ensure your contact information is correct and respond promptly to courier communications.
  • General international parcel shipping cost: USD 35 (for reference).

Return & Refund

1. Eligible Products

Stocked (catalog) products with a unit price under USD 500 are eligible for return within 14 days after delivery.

Custom-made or non-stock items are not eligible for no-reason returns.

2. No-Reason Return (Buyer’s Remorse)

If you wish to return an item for reasons other than product defect or seller error:

  • Please email shop@syronoptics.com to request a return authorization and return address.
  • Buyer is responsible for all return shipping costs.
  • Items must be unused, in original condition, and with original packaging.
  • Refund will be issued after inspection of the returned item.

3. Seller’s Fault (Defective / Wrong / Damaged Item)

If the return is due to seller error (defective product, wrong item shipped, or damage during shipping):

Please provide clear evidence (photos or videos) showing the issue.

We will evaluate the case and either:

  • Provide a replacement, or
    Issue a refund (with or without requiring the item to be returned).
  • Return shipping cost will be covered by the seller in confirmed seller-fault cases.

4. Important Notes

  • Returned items are subject to inspection before refund approval.
  • Shipping fees, customs duties, and taxes are non-refundable unless the return is due to seller fault.
  • Unauthorized returns will not be accepted.

Custom Sizing

Custom sizing is available from 3 × 3 mm (or Ø5 mm) up to 60 × 60 mm. For custom cut sizes, please contact shop@syronoptics.com for a quotation.

Pricing is not significantly lower for small-size orders in low quantities due to operational costs.

Payment Terms

Payments can be made online using Credit Card, Apple Pay, Google Pay, WeChat Pay, and Alipay.

If you prefer to pay by bank transfer, please contact shop@syronoptics.com to request an invoice with our banking details.

If you require deferred payment terms, you may request NET 7 or NET 30 at the time of placing your order.

All requests for deferred payment are subject to approval and will be confirmed by SyronOptics via email.

View full details
  • BP940-50 Bandpass Filter - Covert Surveillance & Night Vision

    BP940-50 Bandpass Filter - Covert Surveillance & Night Vision

    Covert Surveillance & Night Vision

    • Used in security cameras, wildlife trail cameras, and baby monitors where "invisible" illumination is required to avoid detection or disturbance. The filter ensures the sensor only sees the IR illumination and is not washed out by streetlights or daylight.

    Recommended Light Sources

    • 940nm IR LED: It provides completely "invisible" illumination by eliminating the faint red glow visible in standard 850nm LEDs, ensuring the camera remains undetected by intruders and does not disturb sleeping subjects or wildlife.
  • BP940-50 Bandpass Filter - In-Cabin Automotive Monitoring

    BP940-50 Bandpass Filter - In-Cabin Automotive Monitoring

    In-Cabin Automotive Monitoring

    • Driver Monitoring Systems (DMS): Monitors driver attention/drowsiness without distracting them with visible light.
    • Occupant Monitoring: Detection of passengers for airbag deployment or safety alerts.

    Recommended Light Sources

    • 940nm VCSEL or IR LED: It provides high-intensity, invisible illumination that allows the system to track eye gaze and head position through sunglasses and varying cabin lighting without distracting the driver or causing pupil constriction.

Fequently Asked Questions

Will this filter work at an angle?

This filter is optimized for near normal incidence. At larger angles, the center wavelength may shift, which can affect performance. If your system operates at an angle, we recommend validating with a sample.

Can I stack this filter with other filters?

Yes, filters can be stacked to achieve additional blocking or spectral shaping. However, stacking may introduce reflection losses and should be tested in your system.

Can I request a custom wavelength or size?

Yes, we support custom center wavelength (CWL), bandwidth (FWHM), dimensions, and mounting options. Contact us with your requirements for recommendations.

What is the difference between mounted and unmounted filters?

Unmounted filters are bare optics suitable if you already have a holder. Mounted filters come in an anodized aluminum ring (with or without threading) for easier system integration.

  • dia12.5mm(unmounted)

    Clear Aperture:

    >90%

    Mounting Thickness:

    n.a

    Internal/External Thread:

    n.a/n.a

  • dia12.5mm(mounted)

    Clear Aperture:

    dia9mm

    Mounting Thickness:

    3.5mm

    Internal/External Thread:

    n.a/n.a

  • dia25mm(mounted)

    Clear Aperture:

    dia21mm

    Mounting Thickness:

    3.5mm

    Internal/External Thread:

    n.a/n.a

  • dia25mm(unmounted)

    Clear Aperture:

    >90%

    Mounting Thickness:

    n.a

    Internal/External Thread:

    n.a/n.a

  • SM05(0.535″-40TPI)

    Clear Aperture:

    dia9mm

    Mounting Thickness:

    7.62mm

    Internal/External Thread:

    SM05/SM05

  • SM1(1.035″-40TPI)

    Clear Aperture:

    dia21mm

    Mounting Thickness:

    7.62mm

    Internal/External Thread:

    SM1/SM1

  • C-Mount(1″-32TPI)

    Clear Aperture:

    dia21mm

    Mounting Thickness:

    Internal/External Thread:

    C-Mount/C-Mount

  • M25.5x0.5mm(mounted)

    Clear Aperture:

    dia20.5mm

    Mounting Thickness:

    6.5mm

    Internal/External Thread:

    M25.5x0.5mm/M25.5x0.5mm

  • M27x0.5mm(mounted)

    Clear Aperture:

    dia22mm

    Mounting Thickness:

    6.5mm

    Internal/External Thread:

    M27x0.5mm/M27x0.5mm

  • M30.5x0.5mm(mounted)

    Clear Aperture:

    dia25.5mm

    Mounting Thickness:

    6.5mm

    Internal/External Thread:

    M30.5x0.5mm/M30.5x0.5mm

  • M34x0.5mm(mounted)

    Clear Aperture:

    dia29mm

    Mounting Thickness:

    6.5mm

    Internal/External Thread:

    M34x0.5mm/M34x0.5mm

  • M35.5x0.5mm(mounted)

    Clear Aperture:

    dia30.5mm

    Mounting Thickness:

    6.5mm

    Internal/External Thread:

    M35.5x0.5mm/M35.5x0.5mm

  • M37x0.5mm(mounted)

    Clear Aperture:

    dia32mm

    Mounting Thickness:

    6.5mm

    Internal/External Thread:

    M37x0.5mm/M37x0.5mm

  • M52x0.75mm(mounted)

    Clear Aperture:

    dia47mm

    Mounting Thickness:

    6.5mm

    Internal/External Thread:

    M52x0.75mm/M52x0.75mm

  • M55x0.75mm(mounted)

    Clear Aperture:

    dia50mm

    Mounting Thickness:

    6.5mm

    Internal/External Thread:

    M55x0.75mm/M55x0.75mm

  • dia27mm(unmounted)

    Clear Aperture:

    >90%

    Mounting Thickness:

    n.a

    Internal/External Thread:

    n.a/n.a

  • dia34mm(unmounted)

    Clear Aperture:

    >90%

    Mounting Thickness:

    n.a

    Internal/External Thread:

    n.a/n.a

Not sure if this filter fits your system?

We can help you choose the right filter based on your wavelength, light source, and setup.