The non plus ultra for visual deep-sky observers, especially under extremely light-polluted skies. See planetary nebulae and supernova remnants come alive with the enhanced contrast from these filters.
Among the narrowest transmission band O-III filters on the market, ideally suited for both visual use and for many imaging applications thanks to its unsurpassed contrast. No image degradation is perceptible even at the highest magnifications. Features the same ultra-hard, extremely durable vacuum-deposited dielectric coatings employed on the UHC-S filter.
The Baader O-III Filter effectively blocks the entire visual spectrum with the exception of the two closely paired emission lines from doubly ionized oxygen, eliminating the annoying colored halos surrounding stars that often appear through O-III filters manufactured by means of less sophisticated coating technology. We also offer an additional version of this filter with extended infra-red blockage for many of today's IR sensitive CCD chips - the Narrow Band Oxygen III Filter for CCD Imaging - 2" (BP03285)
Transmission
Curve - PDF document
Extended Transmission
Curve
| BPO3125 | $80.00 | Call |
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| BPO32 | $120.00 | in stock |  |
A new generation of light pollution rejection/nebula filter. Our unique “golden mean” design transmits sufficient light for even small aperture telescopes while preserving the high contrast of traditional UHC (Ultra High Contrast”) filters.
Transmission
Curve - PDF document
Extended Transmission
Curve
| BPUHCS125 | $77.00 | in stock | |
| BPUHCS2 | $113.00 | in stock | |
These color filters provide the highest levels of image brightness and freedom from scattered light, combined with uncompromising image sharpness and high magnifications required to observe delicate planetary details.
All surfaces are polished to exacting tolerances of flatness and parallelism to far surpass the performance of "flame-polished" substrates employed in typical economy filters. All surfaces feature 7-layer multi-coatings that reduce reflective losses to a mere 0.25%.
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Transmission Curve - PDF document
Extended Transmission
Curve
| BPCF125 | $132.00 | in stock | |
The ultimate contrast filter for all refractive optical systems. Eliminates color error of inexpensive achromatic doublet objectives to provide the highest level of definition while correcting color balance. Surface details on the Moon and planets stand out boldly.
You haven't really seen Jupiter's Great Red Spot though your achromatic refractor until you've used this filter.
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Transmission Curve - PDF
document
Extended
Transmission Curve
| BPCB125 | $60.00 | in stock | |
| BPCB2 | $92.00 | in stock | |
The REFRACTOR-FILTER for all visual observing and especially for CCD imaging.
Dramatically reduces the bluish and reddish "secondary spectrum" of achromatic refractors while minimally altering the color fidelity of the image. Blocks near-infrared wavelengths from 700 to 1150nm for dramatically sharper stellar images in all refractors.
Ideal in combination with other filters, notably the O-III if used for CCD-work.
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Transmission Curve - PDF
document
| BPFK125 | $63.00 | in stock | |
| BPFK2 | $95.00 | in stock | |
This filter was designed to transmit the maximum amount of incoming light, while suppressing skyglow due to artificial lighting and background glow when the Moon is up. The filter material is a special Neodymium glass that effectively filters out selective wavelengths of low-pressure sodium and other manmade sources.
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Transmission Curve - PDF
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Extended
Transmission Curve
| BPMS125 | $50.00 | in stock | |
| BPMS2 | $81.00 | Call |
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This 2" filter is threaded for 48mm metric threads. Use this filter with the AstroSolar Density 3.8 Film for safe solar observation. Do not attempt to use this filter without a white-light filter in front of your main telescope optics. Serious damage to your eyes could result.
| BPND18 | $49.00 | in stock | |
Unsurpassed contrast of photospheric details is achieved by an extremely narrow half bandwidth of only 8nm. Functions like a monochrometer, suppressing the effects of atmospheric turbulence to provide images that appear markedly more stable.
Focus "Sweet Spot Generator" - completely eliminates the usual focusing guesswork - the image snaps to a razor sharp focus at the exact focal position. Image the sun the way professionals do!
IMPORTANT: The Solar Continuum Filter MUST be used in conjunction with a white-light solar filter in front of the lens. We suggest Astro-Solar Filter material, also from Baader Planetarium. Do not attempt to use this filter without a white-light filter in front of your main telescope optics. Serious damage to your eyes could result.
Transmission
Curve - PDF document
Extended Transmission
Curve
| BPSC125 | $80.00 | in stock | |
| BPSC2 | $122.00 | in stock | |
This is a 2" filter, threaded for 48mm metric threads. With a bandwidth of 45 nanometers, this filter is ideal for isolating H-II regions for excellent contrast in RGB CCD images. The wider bandwidth allows for more light through, while still enhancing the contrast of nebular features. Perfect for minimizing unwanted glow from light polluted skies in the red channel. The 2" filter size allows unvignetted imaging with large format CCD Cameras.
Extended Transmission Curve
| BPHA2 | $160.00 | in stock | |
Narrow Band Oxygen III Filter for CCD Imaging - 8.5 nm - 2" (BPO3285)
This filter is the perfect companion to the 2" H-alpha pass filter shown above. It is an outstanding filter for CCD imagers because of its full 2" size, its narrow bandpass of 8.5 nm (full width at half maximum transmission), and its extended infra-red blockage well past 1000 nm. Although this would still make a great visual OIII filter, it is primarily directed at the CCD imager who needs the infra-red blockage. Visual observers should consider the standard Narrowband O-III Filter which offers a slightly higher maximum transmission rate.
| BPO3285 | $199.00 | in stock | |
This filter finds application in planetary imaging. The passband begins in the deep red region at 670nm and extends well into the infrared. This long wave light can be used in IR LRGB imaging to produce a sharper luminance image for the best planetary contrast. Often the atmospheric seeing is much steadier at these IR wavelengths. Images taken with IR as luminance channel have produced some of the finest Mars pictures during the last opposition. Contrast on Jupiter and other planets is also visibly enhanced
Both surfaces are optically polished to produce diffraction limited images and professionally coated to very tight tolerances.
| BPIRP125 | $63.00 | in stock | |
| BPIRP2 | $99.00 | in stock | |
This filter is a must for all digital imaging with CCD cameras, digital cameras and webcams. Corresponds to the L ("Luminance") filter in an RGB filter set. Provides pinpoint stellar images.
Reflects deleterious infrared rays without heating, while providing 98% transmission over the entire visual spectrum. The plane-parallel polished substrate allows this filter to be employed at large distances from the focal plane, notably in binocular viewers and for eyepiece projection.
Exciting possibilities in combination with other filters! For example, when combined with the Solar Continuum Filter, the entire accessible electromagnetic spectrum is blocked with the exception of a narrow region around 540nm.
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Transmission Curve - PDF document
| BPUVIR125 | $60.00 | in stock | |
| BPUVIR2 | $92.00 | in stock | |