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SKU : CF-OIII3-50
Product Details
Please Note:The interference coatings that optical filters are made with are angle-sensitive and shift to the blue with fast focal ratios. This is not a problem for filters 5nm or wider, but the 3nm filters shift enough to compromise transmission at the wavelength line of interest. Chroma has made a set of Ha, OIII and SII 3nm that are optimized for F/3 beams by moving the center wavelength slightly into the red so they will shift slightly to the blue when used in an F/3 beam, thus maximizing transmission at the nominal wavelength. For beams faster than F/3, we recommend using 5nm-wide or wider bands.
The Chroma 50mm OIII 3nm Narrowband FilterĀ is essential for imaging objects, like nebulae, that are rich in ionized oxygen atoms. These line emission filters work extremely well in heavy light polluted areas and allow you image on nights when the moon is up.
Chroma manufactures the highest quality astronomy filters with durable, sputtered hard coating using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.
Highly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity.
specifications
| Bandpass | 3nm |
| Filter Shape | Round |
| Filter Thickness | 1mm |
| Filter Type | OIII |
| Free Shipping | Yes |
| Size | 50mm |
included items
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United StatesI have a full set of Chroma filters and they have worked well, with minimal reflections or star halos. The 3nm band width of the Ha and O3 really cuts down on the city light pollution sky background gradients.
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