The Baader OIII Visual filter is a 10nm visual narrowband filter designed to accentuate the contrast of emission and planetary nebulae. The high transmission at the Oxygen-III line (502nm) results in a bright, contrasty image in telescopes with an aperture of 6" and larger.
The optical surface is fine-optically polished so that there is no loss of sharpness at high magnifications, even when the filter is positioned far in front of the focal point. They can even be put in front of a binoviewer without introducing astigmatism.
Available in either 1.25" or 2" mounted. The filter cell is threaded on both ends so that multiple filters can be stacked. All Baader filters (excluding 100 x 100mm) come in stackable labelled filter boxes which can be attached to each other to form a sturdy filter library.
Specifications
| Transmission range | OIII |
|---|---|
| Central wavelength | 502 nm |
| Half-bandwidth | 10 nm |
| AR-coating | Dielectric coating, planeoptically polished |
| Filter thickness | 2 mm (without cell), 6 mm with cell |
| Filter size | 2" mounted |
| SKU | BA2458396 |
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
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