Product Details
- Brand: Optolong
- Material: Optical Glass
- Photo Filter Thread Size: 48 Millimeters
- Coating Description: Multi Coating
- Photo Filter Effect Type: Enhancing
- Water Resistance Level: Not Water Resistant
- Product Dimensions: 2"L x 2"W
- Photo Filter Size: 48 Millimeters
- Product Dimensions: 2.91 x 2.91 x 0.87 inches
- Item Weight: 1.41 ounces
- Item model number: 045
- Date First Available: September 17, 2022
- Manufacturer: OPTOLONG
- Difference: It is different from the series of dual-narrowband -eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and Olll emission lines. You will get a darker I sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimized in terms of halo performance, so that there is no obvious halo when shooting on a bright star object.
- Advantage: 1.The advantage of L-Ultimate is that it only passes through the emission lines OllI (500.7nm) and Ha(656.3nm), in which case all other light pollution emission lines are eliminated so that only the emission and reflection signals of the nebula are captured during imaging. Therefore, the sky background of the image is darker, and the contrast between the nebulae and the signal-to-noise ratio are improved to the greatest extent. In heavy light pollution areas, the product can also selectively filter light pollution and clutter signals through the emission lines of nebulae, and finally avoid the impact of light pollution on astrophotography.
Introduction： It's about a 3nn dual band designed to drastically reduce the
effect of light pollution, the 3nm isolates the nebulae's emissions into
H-Alpha (red) and Olll (green-blue). It blocks light pollution, maximizes the
signal from nebulae, and darkens the sky background. It also blocks artificial
light from mercury vapor lamps, high and low pressure sodium vapor lights, and
unwanted natural light caused by the emission of neutral oxygen in our
atmosphere. Maximizes the transmission of the main emission lines of the
nebula in OllI (496nm and 500nm) and H-alpha (656nm). Used with DSL,
color/MONO CMOS and CCD, however, this filter is not suitable for fast ratio
systems.
