OGMA UV/IR Cut Filter 36mm Unmounted with Blackened Edge for Astronomy
The ideal luminance (UV/IR) filter for 36mm filter wheels.
This filter is unmounted; it doesn't have a metal ring.
The blackened edge of this filter helps reduce reflections and stray light, improving contrast and preventing unwanted artifacts in imaging applications.
Specifications
| Diameter | 3mm |
| Edge treatment | Blackened |
| Physical thickness | 1.85mm |
| UV cut off | < 400nm |
| IR cut off | > 700nm |
| Transmission of visible light | > 95% |
| Transmission off band | < 0.1% |
| Surface quality | 60/40 (MIL-O-13830) |
| Surface polished | 1/4 wavefront |
| Surface parallelism | < 30 seconds |
Transmission
Even though each manufactured batch differs slightly, this is a typical transmission curve of our OGMA UV IR Cut filter.
As you can see, the following emission lines that are important for astrophotography are passing at > 95%.
- Hydrogen Alpha (H-Alpha): 656nm
- Sulphur II (SII): 672nm
- Nitrogen II (NII): 654nm and 658nm
Warranty
OGMA warrants your product to be free from defects in materials and workmanship for one year. OGMA will repair or replace a product or part which, upon inspection by OGMA, is found to be defective during one year following the date that you receive the equipment.
For specific details, read OGMA's limited warranty.