The new Optolong L-Ultimate is a dual-band astrophotography filter designed to drastically reduce the effect of light pollution. Its two ultra-narrow 3nm pass bands isolate the nebulae emissions in H-Alpha (red) and OIII (green-blue), maximizing signal and making the sky background dark. The L-Ultimate filter has been optimized for excellent halo performance.
| Passing band | Dual-band H-alpha and O-III 3nm |
|---|---|
| Glass thickness | 1.85 mm |
| Optical flatness | 1/4 λ (wavefront) |
| Bandpass transmission | ~90% |
| Coating | Fully multi-coated |
| Surface quality | 60/40 |
| Parallelism | 30″ |
| Glass type | Monolithic optical substrate (non glued) |
| SKU | OPT-9998 (1.25″), OPT-9999 (2″) |
$489.00 – $599.00
$489.00 – $599.00
The new Optolong L-Ultimate is a dual-band astrophotography filter designed to drastically reduce the effect of light pollution. Its two ultra-narrow 3nm pass bands isolate the nebulae emissions in H-Alpha (red) and OIII (green-blue), maximizing signal and making the sky background dark. The L-Ultimate filter has been optimized for excellent halo performance.
| Passing band | Dual-band H-alpha and O-III 3nm |
|---|---|
| Glass thickness | 1.85 mm |
| Optical flatness | 1/4 λ (wavefront) |
| Bandpass transmission | ~90% |
| Coating | Fully multi-coated |
| Surface quality | 60/40 |
| Parallelism | 30″ |
| Glass type | Monolithic optical substrate (non glued) |
| SKU | OPT-9998 (1.25″), OPT-9999 (2″) |
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