• Spectral transmission graph with a peak at around 500 nm on a white background
  • Green bandpass filter with black rim on a white background
1 2

BP500-40 Bandpass Filter(CWL=500nm,FWHM=40nm)

BP500-40 Bandpass Filter(CWL=500nm,FWHM=40nm)

PartNumber:SO3010210

$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.
  • Wavelength: Center wavelength at 500nm for precise spectral targeting in the cyan-green region
  • Spectral Features: Full Width Half Maximum (FWHM) of 40nm providing optimal bandwidth for GFP emission filtering and machine vision applications
  • Optical Density: OD5 blocking for exceptional out-of-band rejection and superior signal isolation
  • Filter Dimension Availability: Multiple sizes available to fit standard optical systems and custom configurations

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
  • BP500-40 Bandpass Filter - Fluorescence Microscopy (Biomedical)

    BP500-40 Bandpass Filter - Fluorescence Microscopy (Biomedical)

    Fluorescence Microscopy (Biomedical)

    This is the most likely high-value application for an OD5 filter of this type.

    • YFP Excitation: The filter covers the 480–520 nm range, which is the perfect excitation band for Yellow Fluorescent Protein (YFP) (Excitation max ~514 nm) and related fluorophores like SYBR Green (Excitation ~497 nm).
    • CFP Emission: It can serve as an emission filter for Cyan Fluorescent Protein (CFP) (Emission max ~475–505 nm), effectively capturing the fluorescence while blocking the excitation source (if the excitation is <460 nm).
    • FITC/GFP (Widefield): While standard GFP filters are often narrower (e.g., 470/40), this filter captures the peak emission of GFP (509 nm) and FITC (519 nm).

    Recommended Light Source

    • YFP Excitation

    Cyan/Green LEDs or Argon Lasers: Since the filter passes 480–520 nm, you need a source rich in this "cyan" region to efficiently excite Yellow Fluorescent Protein (YFP).

    • CFP Emission

    Deep Blue or Violet LEDs (<460 nm): Here, the filter collects the signal (480–520 nm). You need a light source that is spectrally distant enough to be blocked by the filter's OD5 blocking range (specifically below 460 nm).

    • FITC/GFP (Widefield)

    Standard Blue LEDs (470 nm): While this filter is wider than standard GFP emission filters, it captures the peak emission of GFP (509 nm).

  • BP500-40 Bandpass Filter - Astronomy (Visual & EAA)

    BP500-40 Bandpass Filter - Astronomy (Visual & EAA)

    Astronomy (Visual & EAA)

    • OIII & H-Beta: The 480–520 nm range perfectly centers on the H-Beta line (486.1 nm) and the OIII lines (495.9 nm & 500.7 nm).
    • Use Case: This acts as a "Broadband Nebula Filter" (UHC type), isolating nebulae from light pollution (sodium/mercury streetlights) with high efficiency.

    Recommended Light Source

    • Emission Nebulae (H-Beta & OIII)

    This filter acts as a UHC (Ultra-High Contrast) filter. It is designed to capture the specific glow of ionized gas clouds while blocking the rest of the spectrum.

    1. Doubly Ionized Oxygen (OIII)
    2. Hydrogen-Beta (H-β)

    "Broadband" Nebula Sources

    Because the BP500-40 has a 40nm bandwidth (wide for a nebula filter), it captures both OIII and H-Beta simultaneously. This makes it ideal for complex nebulae that emit light in multiple chemicals.

    1. Orion Nebula (M42)
    2. Lagoon Nebula (M8)

Fequently Asked Questions

Different Types of Filter 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.

What are the Thickness of the Optical Filters?

For Unmounted Optics:

  • 0.5mm
  • 1.1mm
  • 2.0mm

*Most of our optics are coming with 1.1mm and 2.0mm

With Standard Mounting (Mounted, No Thread):

  • 3.5mm (Default)
  • 6mm (Upon Request)

Thread Mounted:

  • 6mm - 8mm

  • 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

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