The Antlia LRGB series filters are specially designed for deep space photography with monochrome cameras. The PRO version has improved halo suppression around bright stars. The strict manufacturing process and the quality control guarantees a tight tolerance of the filter thickness (± 0.05mm) which makes these filters parfocal. This allows the filter change without the need to refocus.
Each filter is fully multi-coated to minimise internal reflections, halos around stars and to assure a high transmission which is above 95%. To even further enhance the contrast, reduce the glare and internal reflections, Antlia applies edge-blackening coating on each filter.
Each filter cuts off the ultraviolet and infrared light so there is no need to use the L filter in combination with the colour filters.
The width of bandpass of the 3 RGB filters is balanced with the spectral response of the most common CCD and CMOS cameras. This expedient allows to balance the exposure of each channel with the ratio of 1:1:1. That means the exposure time in red is equal to the exposure time in green and in blue. During the post-processing, it will be easier to obtain images with a natural colour balance thus without colour dominances. The fourth L filter assures a transmission above 95% across the visible spectrum (420nm to 700nm) cutting out ultraviolet and infrared light.
The design of these filters is optimised to cut out the typical yellow emission of the sodium and mercury lamps around 589nm.
Specifications
| Glass thickness | 2.0 mm ±0.05 for 1.25″, 2″, 31mm, 36mm; 3.0 mm ±0.05 mm for 50mm |
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| Optical flatness | 1/4 λ (wavefront) |
| Bandpass transmission | >95% |
| Off-band transmission | OD3 @ 300-1050 nm |
| Coating | Double-sided multilayer nano-coating |
| Surface quality | 60/40 (in accordance with US military watch MIL-O-13830) |
| Parallelism | <30″ |
| Glass type | Monolithic optical substrate (non glued) |
| Filter size | Mounted 1.25″, 2″, Unmounted 31 mm, 36 mm, 50 mm round, 50 x 50 mm square |
Gallery
| Size | 1.25", 2", 31mm, 36mm, 50mm Round, 50 x 50mm Square |
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Prompt Shipping and Professional Packing
Our long-standing partnership with UPS FedEx DHL and other international carriers gives us the ability to provide an array of shipping services. Our warehouse staff is extremely skilled and will package your items according to our precise and precise specifications. Prior to shipping your items will be thoroughly inspected and secured. We deliver to hundreds of thousands of customers every day in different countries. The fact that we're dedicated to becoming the largest online retailer in the World is obvious. Both Europe as well as the USA have distribution and warehouse centers.
Note: Orders that contain more than one item are assigned a processing period depending on the item.
We will inspect each and every one of the items ordered before shipping. Today, the majority orders will be sent within 48 hours. The delivery time is estimated to be between 3 and seven days.
Returns
The stock market is always changing. It is not managed entirely by us since we're involved with several parties such as the factory and the storage. Stock levels can fluctuate at any given time. Be aware that your order may be unable to fill after you place the order.
Our policy lasts for 30 days. Unfortunately, if 30 days have passed since you purchased your item, we cannot offer you a return or exchange.
You can only return a product when it's unopened and is in the same state as when you received it. It must also be returned in the original packaging.
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