Antlia ALP-T Dual Narrowband OIII (5nm) & H-a (5nm) Filter for f/3.6 & Slower Telesc...
Ships by Next Business Day
Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.
US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.
International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.
The Antlia ALP-T dual band 5nm filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD) 4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.
The filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from the background light pollution.
As Antlia ALP-T dual band 5nm filter looks golden yellow to the naked eye, we also call it the Golden filter.
Application and Performance:
- Engineered specifically for use with DSLR, CMOS, and CCD color cameras and for telescopes f/3.6 and larger (slower)
- Suppression of optical density (OD) 4.5 on unwanted visual wavelengths adds signal-to-noise
- Extremely steep bandpass edges minimize internal reflections
- Ideal flat-top and moderate bandpass reducing spectrum down shifts
- Ion Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter
- Good performance at focal ratios slower than F3.6 with contrast increasing as focal ratio increases
- Designed to suppress artificial lighting from Bortle scale 1 to Bortle scale 8
- Near IR (NIR) is blocked up to 1100nm
Technical Data:
Hydrogen-alpha
- FWHM: 5nm
- CWL (Central Wavelength): 656.3nm
- Peak Transmission: 90%
- Blocking: ≥OD4.5 @ 300-1100nm
- Filter Thickness: 2mm+/-0.05mm
Oxygen III
- FWHM: 5nm
- CWL (Central Wavelength): 500.7nm
- Peak Transmission: 82%
- Blocking: ≥OD4.5 @ 300-1100nm
- Filter Thickness: 2mm+/-0.05mm
Filter Ring:
- 2’’ Mounted (M48*0.75 thread)
- Ultra-thin filter cell to minimize vignetting by maximizing possible clear aperture
- Black Anodized Finish
- Laser Engraving, No Fading
Not Recommended:
- Solar Observing and imaging
- Night visual observation
- DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
The Antlia ALP-T dual band 5nm filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD) 4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.
The filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from the background light pollution.
As Antlia ALP-T dual band 5nm filter looks golden yellow to the naked eye, we also call it the Golden filter.
Application and Performance:
- Engineered specifically for use with DSLR, CMOS, and CCD color cameras and for telescopes f/3.6 and larger (slower)
- Suppression of optical density (OD) 4.5 on unwanted visual wavelengths adds signal-to-noise
- Extremely steep bandpass edges minimize internal reflections
- Ideal flat-top and moderate bandpass reducing spectrum down shifts
- Ion Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter
- Good performance at focal ratios slower than F3.6 with contrast increasing as focal ratio increases
- Designed to suppress artificial lighting from Bortle scale 1 to Bortle scale 8
- Near IR (NIR) is blocked up to 1100nm
Technical Data:
Hydrogen-alpha
- FWHM: 5nm
- CWL (Central Wavelength): 656.3nm
- Peak Transmission: 90%
- Blocking: ≥OD4.5 @ 300-1100nm
- Filter Thickness: 2mm+/-0.05mm
Oxygen III
- FWHM: 5nm
- CWL (Central Wavelength): 500.7nm
- Peak Transmission: 82%
- Blocking: ≥OD4.5 @ 300-1100nm
- Filter Thickness: 2mm+/-0.05mm
Filter Ring:
- 2’’ Mounted (M48*0.75 thread)
- Ultra-thin filter cell to minimize vignetting by maximizing possible clear aperture
- Black Anodized Finish
- Laser Engraving, No Fading
Not Recommended:
- Solar Observing and imaging
- Night visual observation
- DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
Antlia ALP-T Dual Narrowband OIII (5nm) & H-a (5nm) Filter for f/3.6 & Slower Telescopes - 2" Mounted