Optolong IR Pass 685nm Filter - 1.25" Mounted
Optolong
Optolong IR Pass 685nm Filter - 1.25" Mounted is a narrowband filter in 1.25" for mono emission-line imaging.
imaging-filter budget
Best Current Offer
Starizona
In stock
Specifications
Filter
- Filter type
- Infrared pass filter
- Filter size
- 1.25" / Mounted
Spectral
- Passbands
- IR pass 685 nm
- Band count
- 1 band
Specifications
- Thickness
- 1.85 mm
- Substrate / coating
- B270 optical glass
Use
- Camera use
- Color or mono astronomy cameras, depending on target and workflow
Astrophotography Fit
Best for isolating emission lines with a mono camera and filter wheel.
Optolong IR Pass 685nm Filter - 1.25" Mounted is a budget-friendly narrowband filter (1.25").
Best for isolating emission lines with a mono camera and filter wheel.
Choose filter size around the sensor diagonal, telescope speed, and filter-wheel or drawer geometry. Flats are still required; a filter can improve contrast, but it will not rescue tilt, bad focus, or poor calibration.
Best paired with
- Monochrome camera, matching filter wheel, and autofocus offsets
- Ha/OIII/SII emission nebula projects
- Long integrations with darks, flats, and careful star handling
Not recommended for
- Unmodified color cameras as the primary workflow
- Targets dominated by broadband continuum signal
- Users who want natural star color with minimal processing
Where To Buy
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| Retailer | Price | Availability | View Offer |
|---|---|---|---|
| Starizona Starizona | $89.00 | In stock Updated 5/13/2026 | View Offer - $89.00 |