• Graph showing the transmission rate on the y-axis against wavelength in nanometers on the x-axis for a bandpass filter with a central wavelength (CWL) of 350nm and a bandwidth (FWHM) of 50nm.
  • Black bandpass filter with technical specifications on a white background
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BP350-50 Bandpass Filter(CWL=350nm,FWHM=50nm)

BP350-50 Bandpass Filter(CWL=350nm,FWHM=50nm)

PartNumber:SO3010077

$55.00 USD
$55.00 USD
Sale Sold out
Shipping calculated at checkout.
Center Wavelength (CWL) // FWHM
Optical Density // Peak Transmission (Tpk)
Dimension

In Stock.

Ships within 5 working days of order.

Holiday notice: Orders placed Feb 10–25 may ship later than usual. Free shipping applies during this period.
  • Wavelength: 350nm center wavelength (CWL) for UV fluorescence imaging and DAPI excitation
  • Spectral Features: 50nm FWHM bandwidth with high transmission and controlled edge slopes
  • Optical Density: OD5 blocking for superior out-of-band rejection
  • Filter Dimension Availability: Multiple mounting diameters available to fit standard optical systems

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
  • BP350-50 Bandpass Filter - UV Imaging & Machine Vision

    BP350-50 Bandpass Filter - UV Imaging & Machine Vision

    UV Imaging & Machine Vision

    • Surface Inspection: UV light scatters differently than visible light. This filter allows cameras to detect surface scratches, dust, or defects on glass/plastic that are invisible to the naked eye.
    • Forensics: Detection of bodily fluids, fingerprints, or counterfeit currency/documents, which often fluoresce or appear differently under 350-365 nm light.

    Recommended Light Sources

    • UV LEDs (365 nm): 365 nm LEDs are inexpensive, widely available, and their peak output falls perfectly within the filter's high-transmission range. (Avoid 395 nm LEDs, as they fall outside the passband).
    • Mercury (Hg) Arc Lamps: These lamps have a strong spectral line at 365.4 nm (the "i-line"). This is the traditional source for high-power fluorescence microscopy.
    • Nd:YAG Lasers (355 nm): Frequency-tripled Nd:YAG lasers emit at 355 nm, which is nearly dead-center for this filter. Ideal for laser-induced fluorescence (LIF) or Raman spectroscopy setups.
    • Xenon Arc Lamps: Broadband sources that produce significant UV continuum. The filter would "slice" out just the 325-375 nm portion for the application.
  • BP350-50 Bandpass Filter - UV Curing Monitoring

    BP350-50 Bandpass Filter - UV Curing Monitoring

    UV Curing Monitoring

    • Monitoring the intensity of UV curing systems used in adhesives and coatings.

    Recommended Light Source

    • UV LEDs (Peak Wavelength: 365 nm): High-power Light Emitting Diodes that emit a narrow spectral band centered at 365 nm. This is the modern standard for spot-curing adhesives and medical device assembly.
    • Mercury (Hg) Arc Lamps (Medium Pressure): Traditional broad-spectrum industrial lamps often used for curing coatings on conveyor belts. They produce massive amounts of UV energy across many wavelengths, but the "i-line" at 365 nm is often the primary driver for initiating the chemical cure (photoinitiation).

Fequently Asked Questions

What are the Thickness of the Optical Filters?

For standard mounting (mounted,non-thread):

  • 3.5mm (by default)
  • 6mm (by request)

For unmounted Optics:

  • 0.5mm
  • 1.1mm
  • 2mm

(most of the unmounted optics are having thickness of 1.1mm ~ 2mm)

What is the difference between mountings?

Unmounted:

  • a bare glass optical filter

Mounted:

  • Smooth Mount for protection of the optics. No thread is there on the mount.

Metric Mount:

  • Start with M as prefix, usually seens as M25.5x0.5mm. Mostly used as camera filters

Imperial Mount:

  • Start with SM as prefix, usually seen SM1, SM05 etc... Mostly used in Optical system. (You will have a SM external thread to connecting to other objects)

C-Mount:

  • Very frequently used mounting. C-Mount is 1‘’-32TPI. And it is not the same thing as SM1, or M25.5x0.5mm.

  • dia12.5mm(mounted)

    Clear Aperture:

    dia9mm

    Mounting Thickness:

    3.5mm

    Internal/External Thread:

    n.a/n.a

  • dia12.5mm(unmounted)

    Clear Aperture:

    >90%

    Mounting Thickness:

    n.a

    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

Need any help?