• Graph showing the transmission percentage on the y-axis against wavelength in nanometers on the x-axis, indicating the filter's cut-on and blocking capabilities.
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LP690 Longpass Filter (T>90%@700-1100nm, OD2@350-680nm)

LP690 Longpass Filter (T>90%@700-1100nm, OD2@350-680nm)

$50.00 USD
$50.00 USD
Sale Sold out
Shipping calculated at checkout.
Cut-on Wavelength
Transmission // Blocking
Dimension

In Stock.

Ships within 5 working days of order.
  • Wavelength: LP690 longpass filter optimized for far-red to NIR applications from 700-1100nm
  • Spectral Features: Sharp cut-on at 690nm with >90% transmission above 700nm for superior signal clarity
  • Optical Density: OD2 blocking from 350-680nm ensures effective rejection of shorter wavelengths
  • Filter Dimension Availability: Multiple sizes available – contact us for custom dimensions and mounting options

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.

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.

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.

lp360-d12.5

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  • LP690 Longpass Filter - Far-Red/NIR Fluorescence Imaging

    LP690 Longpass Filter - Far-Red/NIR Fluorescence Imaging

    Far-Red/NIR Fluorescence Imaging

    This is the most common scientific application for an LP690 filter. It is used as an Emission Filter to block excitation light and pass the fluorescence signal from far-red fluorophores.

    • Function: The filter blocks the visible excitation light (OD2 @ 350-680nm) while transmitting the longer-wavelength fluorescence emitted by the sample (T>90% @ 700-1100nm).
    • Target Fluorophores: Dyes and proteins that fluoresce in the Near-Infrared (NIR) window, such as E2-Crimson, Cy5.5, Alexa Fluor 680, or 700, and IR-Dye 700.

    Recommended Light Sources (Excitation)

    • LEDs: High-power LEDs with peak wavelengths in the Orange to Deep Red range (e.g., 590nm, 630nm, or 660nm). The filter effectively blocks this source light from reaching the sensor.
    • Lasers: 633nm HeNe lasers or 635-660nm diode lasers.
  • LP690 Longpass Filter - Machine Vision & Surveillance (NIR Imaging)

    LP690 Longpass Filter - Machine Vision & Surveillance (NIR Imaging)

    Machine Vision & Surveillance (NIR Imaging)

    In industrial or security settings, this filter is used to remove visible light noise and strictly image in the Near-Infrared spectrum.

    • Function: It blocks visible ambient light (sunlight glare, overhead room lighting) which can cause variable contrast, and only accepts controlled NIR illumination.
    • Use Cases: Optical Character Recognition (OCR) on colored packaging, inspection of produce (bruise detection often requires NIR), and night-vision surveillance.

    Recommended Light Sources (Illumination)

    • NIR LEDs: The light source must emit in the filter's passband. Recommended peaks are 730nm, 850nm, or 940nm.
    • Broadband IR Illuminators: Tungsten or Halogen lamps can be used if they are filtered or if the heat/broad spectrum is acceptable.

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