How to choose OD for qPCR detection
Use stronger blocking when neighboring dye channels are close or detector gain is high. For routine qPCR, confirm both in-band transmission and out-of-band rejection before changing a standard filter set.
qPCR Optical Filters: Excitation, Emission & Dichroic
Compare excitation filters, emission filters, and dichroic mirrors for common qPCR fluorescence channels. Use the tables to match dye channel, wavelength, FWHM, blocking level, and mechanical size before requesting a quote.
How to Choose
Start with the dye channel and instrument optical path. Match excitation and emission wavelength first, then confirm FWHM, OD blocking, dichroic transition, angle of incidence, and filter dimensions. For multi-channel qPCR systems, keep enough spectral separation between neighboring dyes to reduce crosstalk.
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Fluorescent PCR Filters
OPTOStokes PCR filters are designed for real-time fluorescence quantitative PCR instruments including Bio-Rad CFX, Applied Biosystems QuantStudio, and Roche LightCycler. These filters provide high transmittance at target wavelengths with deep out-of-band blocking for accurate fluorescence detection in multi-channel PCR systems. Use the fluorophore-to-filter mapping table below to quickly identify the right filters for FAM, HEX, CY5, ROX, and more.
PCR Fluorophore Channel Matrix
Start with the dye channel, then confirm the excitation, emission, and dichroic components as one optical path. The matrix below is the latest reviewed PCR application profile.
| Dye / Channel | Excitation Filter Model | Emission Filter Model | Longpass Dichroic | Shortpass Dichroic |
|---|---|---|---|---|
| Atto 425 | STO-430-24 | STO-480-30 | STO-DM450LP | Not specified |
| FAM/SYBR Green | STO-470-30 | STO-520-20 | STO-DM505LP | STO-DM500SP |
| HEX/VIC/JOE | STO-530-20 | STO-565-22 | STO-DM550LP | STO-DM550SP |
| CY3/TAMRA | STO-543-20 | STO-585-20 | STO-DM565LP | STO-DM565SP |
| ROX/Texas Red | STO-570-20 | STO-612-20 | STO-DM590LP | STO-DM600SP |
| Atto 633 | STO-620-20 | STO-655-20 | STO-DM635LP | Not specified |
| CY5/Qusar 670 | STO-630-20 | STO-675-20 | STO-DM650LP | STO-DM650SP |
| CY5.5/Qusar 705 | STO-675-20 | STO-725-30 | STO-DM700LP | STO-DM690SP |
| CY7 | STO-725-30 | STO-800-30 | STO-DM770LP | Not specified |
PCR Bandpass Filter Models
Sixteen canonical bandpass models are shown once each. Excitation and emission roles are application profiles; shared mechanical formats are listed once in the engineering reference table below.
| Model | Dye / Role | CWL (nm) | FWHM (nm) | Transmittance (T) | Blocking | Formats |
|---|---|---|---|---|---|---|
| STO-430-24 | Excitation — Atto 425 | 430 ± 3 | 24 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-470-30 | Excitation — FAM/SYBR Green | 470 ± 3 | 30 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-480-30 | Emission — Atto 425 | 480 ± 3 | 30 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-520-20 | Emission — FAM/SYBR Green | 520 ± 3 | 20 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-530-20 | Excitation — HEX/VIC/JOE | 530 ± 3 | 20 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-543-20 | Excitation — CY3/TAMRA | 543 ± 3 | 20 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-565-22 | Emission — HEX/VIC/JOE | 565 ± 3 | 22 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-570-20 | Excitation — ROX/Texas Red | 570 ± 3 | 20 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-585-20 | Emission — CY3/TAMRA | 585 ± 3 | 20 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-612-20 | Emission — ROX/Texas Red | 612 ± 3 | 20 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-620-20 | Excitation — Atto 633 | 620 ± 3 | 20 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-630-20 | Excitation — CY5/Qusar 670 | 630 ± 3 | 20 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-655-20 | Emission — Atto 633 | 655 ± 3 | 20 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-675-20 | Excitation — CY5.5/Qusar 705; Emission — CY5/Qusar 670 | 675 ± 3 | 20 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-725-30 | Excitation — CY7; Emission — CY5.5/Qusar 705 | 725 ± 3 | 30 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) | |
| STO-800-30 | Emission — CY7 | 800 ± 3 | 30 ± 3 | T>91% | ODavg > 6 at 350-800 nm (out-of-band; passband excluded where applicable); OD > 3 at 800-1050 nm (out-of-band; passband excluded where applicable) |
Standard Mechanical Formats
These reviewed mechanical formats apply to the PCR bandpass models shown above. Search size, shape, mounting, clear aperture, or substrate here without repeating the same details in every product row.
| Format Family | Standard Format | Shape | Mounting | Clear Aperture | Retainer Tolerance | Size Tolerance | Substrate | Applies To |
|---|---|---|---|---|---|---|---|---|
| 1 format variants · Round · unmounted · 1.0 mm substrate | Ø25 × 1.0 mm, unmounted | Round | unmounted | Ø24.5 mm | Not applicable | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Square · unmounted · 1.0 mm substrate | 12 × 12 × 1.0 mm, unmounted | Square | unmounted | 11.5mm × 11.5 mm | Not applicable | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Round · unmounted · 1.0 mm substrate | Ø6 × 1.0 mm, unmounted | Round | unmounted | Ø5.5 mm | Not applicable | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Round · unmounted · 1.0 mm substrate | Ø10 × 1.0 mm, unmounted | Round | unmounted | Ø9.5 mm | Not applicable | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Round · unmounted · 1.0 mm substrate | Ø12.7 × 1.0 mm, unmounted | Round | unmounted | Ø12.0 mm | Not applicable | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Square · unmounted · 1.0 mm substrate | 10 × 10 × 1.0 mm, unmounted | Square | unmounted | 9.5mm × 9.5 mm | Not applicable | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Round · unmounted · 1.0 mm substrate | Ø25.4 × 1.0 mm, unmounted | Round | unmounted | Ø25.0 mm | Not applicable | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Round · unmounted · 1.0 mm substrate | Ø12 × 1.0 mm, unmounted | Round | unmounted | Ø11.5 mm | Not applicable | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Square · unmounted · 1.0 mm substrate | 6 × 6 × 1.0 mm, unmounted | Square | unmounted | 5.5mm × 5.5 mm | Not applicable | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Round · mounted · 1.0 mm substrate | Ø12 × 6.0 mm, mounted | Round | mounted | Ø8.0 mm | +0.0/-0.1 mm | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Round · mounted · 1.0 mm substrate | Ø25 × 3.5 mm, mounted | Round | mounted | Ø22.0 mm | +0.0/-0.1 mm | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
| 1 format variants · Round · unmounted · 1.0 mm substrate | Ø8 × 1.0 mm, unmounted | Round | unmounted | Ø7.5 mm | Not applicable | Not specified | 1.0 mm (±0.1 mm) | 16 PCR bandpass models |
PCR Dichroic Mirror Models
The latest PCR dichroic set contains fifteen LP/SP models. Each model keeps its dimensional variants under one product identity; shared LP and SP mechanical formats are listed once below.
| Model | Type | Dye Channel | AOI | Transmission Range (nm) | Reflection Range (nm) | Transmittance | Reflectivity | Formats |
|---|---|---|---|---|---|---|---|---|
| STO-DM500SP | SP | FAM/SYBR Green | 45° | 440-485 | 515-700 | Tave≥95.1% | T≥95.1% | |
| STO-DM450LP | LP | Atto 425 | 45° | 465-680 | 380-445 | Tave≥95.1% | T≥95.1% | |
| STO-DM550SP | SP | HEX/VIC/JOE | 45° | 480-530 | 565-700 | Tave≥95.1% | T≥95.1% | |
| STO-DM565SP | SP | CY3/TAMRA | 45° | 480-550 | 580-700 | Tave≥95.1% | T≥95.1% | |
| STO-DM600SP | SP | ROX/Texas Red | 45° | 480-580 | 620-700 | Tave≥95.1% | T≥95.1% | |
| STO-DM650SP | SP | CY5/Qusar 670 | 45° | 480-635 | 670-800 | Tave≥95.1% | T≥95.1% | |
| STO-DM690SP | SP | CY5.5/Qusar 705 | 45° | 480-675 | 715-800 | Tave≥95.1% | T≥95.1% | |
| STO-DM505LP | LP | FAM/SYBR Green | 45° | 515-700 | 450-490 | Tave≥95.1% | T≥95.1% | |
| STO-DM550LP | LP | HEX/VIC/JOE | 45° | 560-700 | 450-538 | Tave≥95.1% | T≥95.1% | |
| STO-DM565LP | LP | CY3/TAMRA | 45° | 575-700 | 450-555 | Tave≥95.1% | T≥95.1% | |
| STO-DM590LP | LP | ROX/Texas Red | 45° | 605-700 | 450-580 | Tave≥95.1% | T≥95.1% | |
| STO-DM635LP | LP | Atto 633 | 45° | 650-700 | 450-630 | Tave≥95.1% | T≥95.1% | |
| STO-DM650LP | LP | CY5/Qusar 670 | 45° | 670-700 | 450-645 | Tave≥95.1% | T≥95.1% | |
| STO-DM700LP | LP | CY5.5/Qusar 705 | 45° | 715-800 | 450-685 | Tave≥95.1% | T≥95.1% | |
| STO-DM770LP | LP | CY7 | 45° | 780-900 | 600-755 | Tave≥95.1% | T≥95.1% |
Dichroic Mechanical Formats
LP and SP formats remain separate where the reviewed substrate thickness differs. The reference table preserves size tolerance and substrate information for engineering review.
| Format Family | Standard Format | Shape | Mounting | Clear Aperture | Retainer Tolerance | Size Tolerance | Substrate | Applies To |
|---|---|---|---|---|---|---|---|---|
| 1 format variants · Rectangular · unmounted · 1.0 mm substrate | 10mm × 15mm, unmounted | Rectangular | unmounted | Not specified | Not specified | +0.0/-0.1 mm | 1.0 mm (±0.1 mm) | 9 PCR dichroic models |
| 1 format variants · Rectangular · unmounted · 1.0 mm substrate | 6mm × 9mm, unmounted | Rectangular | unmounted | Not specified | Not specified | +0.0/-0.1 mm | 1.0 mm (±0.1 mm) | 9 PCR dichroic models |
| 1 format variants · Rectangular · unmounted · 1.0 mm substrate | 8mm × 12mm, unmounted | Rectangular | unmounted | Not specified | Not specified | +0.0/-0.1 mm | 1.0 mm (±0.1 mm) | 9 PCR dichroic models |
| 1 format variants · Rectangular · unmounted · 1.0 mm substrate | 17.5mm × 12.5mm, unmounted | Rectangular | unmounted | Not specified | Not specified | +0.0/-0.1 mm | 1.0 mm (±0.1 mm) | 9 PCR dichroic models |
| 1 format variants · Rectangular · unmounted · 1.1 mm substrate | 10mm × 15mm, unmounted | Rectangular | unmounted | Not specified | Not specified | +0.0/-0.1 mm | 1.1 mm (±0.1 mm) | 6 PCR dichroic models |
| 1 format variants · Rectangular · unmounted · 1.1 mm substrate | 17.5mm × 12.5mm, unmounted | Rectangular | unmounted | Not specified | Not specified | +0.0/-0.1 mm | 1.1 mm (±0.1 mm) | 6 PCR dichroic models |
| 1 format variants · Rectangular · unmounted · 1.1 mm substrate | 6mm × 9mm, unmounted | Rectangular | unmounted | Not specified | Not specified | +0.0/-0.1 mm | 1.1 mm (±0.1 mm) | 6 PCR dichroic models |
| 1 format variants · Rectangular · unmounted · 1.1 mm substrate | 8mm × 12mm, unmounted | Rectangular | unmounted | Not specified | Not specified | +0.0/-0.1 mm | 1.1 mm (±0.1 mm) | 6 PCR dichroic models |
Source revision: 20260827-02. Internal inventory fields and material codes are excluded from the public catalog. Confirm final coating curves and mechanical drawings for production use.
Related Engineering Notes
Matching filters to instrument geometry
PCR instruments may use compact optical paths, fixed holders, and non-standard angles. Check clear aperture, thickness, and AOI before assuming a wavelength match is enough.
When custom PCR filters make sense
Custom CWL or FWHM is useful when an assay uses uncommon dyes, multiplex channels, or a legacy instrument with limited space.
FAQ
Which PCR dyes are commonly matched on this page?
The page supports common qPCR channels such as FAM, SYBR Green, HEX, VIC, JOE, ROX, CY5, CY5.5, and CY7.
Do I need excitation, emission, and dichroic filters together?
Most fluorescence instruments use a matched optical set. The excitation filter selects the light source band, the dichroic directs the beam, and the emission filter passes the fluorescence signal to the detector.
Can these PCR filters be customized for OEM instruments?
Yes. Wavelength, bandwidth, OD blocking, size, thickness, and channel combinations can be adjusted for OEM optical layouts.
Quality & Compliance
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For OEM programs, laboratory instruments, and industrial systems, OPTOStokes keeps quality, material compliance, and engineering support visible from the start of supplier evaluation.
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Process control, inspection records, and repeatable coating workflows for production optical components.
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Wavelength, FWHM, substrate, AOI, size, and mounting requirements can be reviewed with engineering.
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Share target wavelength, blocking level, transmittance, and drawing requirements for a focused quote.
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