• Graph showing the transmission percentage of a longpass filter against wavelength, with a cut-on wavelength of 445nm and a blocking range marked as OD6@200-435nm.
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LP440 Longpass Filter (T>95%@445-1200nm, OD6@200-435nm)

LP440 Longpass Filter (T>95%@445-1200nm, OD6@200-435nm)

$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. Customs handling including. (DDP)
  • Wavelength: LP440 longpass filter optimized for blue to NIR applications from 445-1200nm
  • Spectral Features: Sharp cut-on at 440nm with >95% transmission above 445nm for superior signal clarity
  • Optical Density: OD6 blocking from 200-435nm ensures exceptional rejection of UV and violet 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.

View full details
  • LP440 Longpass Filter - Forensic Science (Crime Scene Investigation)

    LP440 Longpass Filter - Forensic Science (Crime Scene Investigation)

    Forensic Science (Crime Scene Investigation)

    Investigators use special UV or deep blue flashlights to search for hidden evidence like fingerprints, bodily fluids, or forged documents. These hidden traces will glow a faint color when hit by the light. This filter acts as a high-tech "barrier" on the investigator's camera lens or goggles. It completely blocks the harsh, overpowering glare of the flashlight itself, letting only the faint, glowing colors of the evidence pass through so it can be seen and photographed clearly.

    Recommended light source:

    • 365nm UV LED Flashlight: This is a standard tool that makes many hidden substances (like certain fluids or fibers) glow naturally. The advantage is that the filter provides an absolute brick wall (OD6 rating) against the intense UV light, preventing the camera from being blinded and making the faint glow stand out sharply against a dark background.
    • 415nm Forensic Blue Light: This is used to illuminate special fluorescent powders when dusting for fingerprints. The advantage here is perfect timing: the filter chops off this harsh blue light entirely, allowing only the bright green or orange glow of the fingerprint powder to pass through to the camera.
  • LP440 Longpass Filter - Medical Dermatology (Skin Examination)

    LP440 Longpass Filter - Medical Dermatology (Skin Examination)

    Medical Dermatology (Skin Examination)

    Skin doctors use special UV lights to look beneath the surface of the skin for hidden sun damage, bacterial infections, or pigment issues. Different skin conditions or bacteria will glow in specific colors when the UV light hits them. By placing this filter over a diagnostic camera, it completely blocks the invisible UV rays bouncing off the patient's skin. This ensures the camera captures only the clear, visible glowing colors (like the coral-red glow of certain bacteria) that the doctor needs to make an accurate diagnosis.

    Recommended light source:

    • 365nm "Wood's Lamp" (Medical UV Light): This is the most common medical tool for making skin conditions glow. The major advantage of using this light with your filter is safety and clarity; the filter perfectly traps the harmful UV rays so they don't hit the camera sensor, leaving a pure, high-contrast image of the skin's reaction.
    • High-Power LED Deep Blue (400-420nm) Ring Light: Used for close-up medical photography. The advantage of this light source is that it delivers a massive amount of energy to make the skin glow brightly, while the filter easily handles and eliminates all the distracting blue glare that would otherwise ruin the photograph.

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