The ALP-T dual-band 5nm high-speed filters are further optimized to work with high-speed imaging systems by slightly changing the passband and center wavelength. Using these high-speed filters between the f/2.2 and f/3.6 optics shows much stronger and more contrasty nebula images compared to the standard version.
For optical f-ratios slower than f/3.6, the standard 5nm dual-band ALP-T filter is strongly recommended. In the meantime, if you're looking for the best possible performance with any lens faster than f/2.2, the high-speed version is the best option.
But note that the blue shift data from the computer simulation indicates that the narrowband filter shifts its bandwidth to shorter wavelengths with optics faster than f/2, transmission at wavelength emission wave can decrease perhaps between 15% and 20%. Although the Antlia ALP-T high speed filter has similar transmission rate reduction in H-a and OIII when the filter is used in fast optics, based on user data of the current standard version, it is evident that the filter still has the high emission increase performance. contrast of nebula and halo minimized.
The price of the high speed version is the same as standard filters and double the benefits for users of high speed optics. It is worth mentioning that Antlia inspected and measured the products piece by piece with one of the Agilent Carys professional spectrophotometers, the resolution/slit width is up to 0.2nm, which allows us to offer you highly reliable and consistent products.
Antlia 5nm dual band filters
The Antlia ALP-T Series Dual Band 5nm Filter is a dual line pass filter that was designed for use primarily with single shot color cameras (OSCs) such as DSLRs and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save image capture time. Advanced multiple coatings on the ALP-T ultra dual band filter effectively isolate red Ha light and blue-green OIII lines from emission nebulae, with near-total suppression of optical density (OD4.5) at wavelengths of unwanted wave of light pollution. the light of the moon and the brightness of the air. The result is that the 5nm dual-band ALP-T filter creates a higher signal-to-noise ratio and better contrast in your images.
The filter allows the two main bands of emission nebulae to be captured at the same time, while suppressing unwanted light pollution. It allows you to capture cleaner data and reduces post-processing efforts to isolate faint details from background light pollution.
Antlia High Speed Narrowband Filters Features at a Glance:
♦ High light transmission and lower bandwidth to maximize contrast.
♦ Steep spectral profile minimizes halos around bright stars
♦ Unique substrate to eliminate internal reflections
♦ Usable in areas with light pollution and dark places
♦ Extends exposure time in moonlight conditions
♦ Antlia Narrow Band Pro Filters can be used very well between F/3.6 and F/2.2 focal ratio.
♦ All Antlia narrowband filters are blackened at the edges to prevent internal reflections from stray light.
♦ Superior optical reliability reduces image post-processing effort
||f/2.2 to f/3.6
||Schott optical substrate
||Low-profile metal cell with M48x0.75 filter thread
||657.8 nm (88%), 502.2 nm (82%)
||≥OD4.5 @ 300-1050 nm
||up to 1050 nm
||S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)
||Lambda/4 or better