PRO PERFORMANCE FOR HIGH DEFINITION IMAGES
Digital High Light Transmission (HLT) Filter Series is designed especially for discerning user who demands the best available quality optical filter to protect their valuable lens and at the same time offering high quality images.
Resolution of digital images depends on the quality of lenses used on DSLR body. It is therefore essential that the quality of the filter used in front of the lens must be of the highest possible quality in order to maintain the best quality that the DSLR lenshad to offer.
Critical aspects that would affect image resolution are identified and placed in high emphasis in the production of this filter.
Resolution of digital images depends on the quality of lenses used on DSLR body. It is therefore essential that the quality of the filter used in front of the lens must be of the highest possible quality in order to maintain the best quality that the DSLR lenshad to offer.
Critical aspects that would affect image resolution are identified and placed in high emphasis in the production of this filter.
OPTICAL CHARACTERISTICS
HIGH GRADE OPTICAL GLASS
The core component in the composition of a quality filter is the type of glass used. Filters within the HLT series incorporate optical grade glass which undergo ground and polishing process to ensure the highest level of picture sharpness that the lens are capable of capturing.
BROADBAND ANTI REFLECTION MULTI COATING
HLT optical glass are treated with broadband anti reflection coating which enable over 99% of available ambience light to pass through a broader visible spectrum from 450nm-650nm*.
*Standard multi-coating allows a narrower spectrum of light to pass through from 500-600nm
*Standard multi-coating allows a narrower spectrum of light to pass through from 500-600nm
Graphic 1.1: Transmission Light Graph with over
99% oflight entrance compared to non-coated glass
6 layers of anti-reflection coating on both sides effectively block out stray light from entering the camera sensor so that the highest clarity of digital images can be taken.
Graphic 1.2: Anti-reflection light ray path versus non coated light ray path
WATER REPELLENT COATING*
Graphic 1.1: Transmission Light Graph with over
99% oflight entrance compared to non-coated glass
Graphic 1.3: 6 layers of broadband anti reflection
coating with
addition
layer of water repellent coating
layer of water repellent coating
Additional layer of water repellent coating applied on top of the anti-reflection coating prevent permanent settlement of dust, dirt and water on glass surface.
This additional layer of coating repels oil and water by consolidating liquids into large droplets for fast removal.
*Only available for HLT Pro UV Lens Protector
This additional layer of coating repels oil and water by consolidating liquids into large droplets for fast removal.
*Only available for HLT Pro UV Lens Protector
GLASS MANUFACTURING PROCESS
Optical glass are grounded and polished to achieve an ultra thin
thickness of 1.4mm.
Internal reflections are further minimized by apply black ink coating
surrounding the glass edges.
thickness of 1.4mm.
Internal reflections are further minimized by apply black ink coating
surrounding the glass edges.
Pic 1: Optical glass ground and polished to 1.4mm
Black ink coating process applied on glass edges
Black ink coating process applied on glass edges
FILTER FRAME CHARACTERISTICS
ULTRA THIN FRAME
Precise CNC is used to machine the ultra thin frame to achieve a ultra thin
height of 3mm. This enables the filter to be lighter and also suitable for
usage on wide angle lens without vignette (darken of 4 corners).
height of 3mm. This enables the filter to be lighter and also suitable for
usage on wide angle lens without vignette (darken of 4 corners).
ANTI REFLECTION FINISHING
CNC machined ultra thin filter rings are treated with anti-reflection black anodizing process to prevent unwanted external light reflection from entering the camera sensor.
CAPS & FILTER INSTALLATION
Despite its ultra thin frame, front threads are incorporated at the front frame to enable proper installation of lens protection cap or other special application filters
HLT PRO UV LENS PROTECTOR
Provides complete protection for your valuable lens without compromising picture quality. Optical glass are treated with 6 layers of anti reflection broadband and 1 layer of water repellent coating. Recommended as a permanent leave on filters at all times.
HLT PRO UV (O) CUTOFF
Reduce blue cast caused by UV ray below 380nm to achieve high clarity clarity. UV glass are further coated with 6 layers of broadband anti reflection coating that increases light transmission to over 99% while suppressing any possible reflection to below 1%. Recommended to leave on lens once fitted for UV and lens protection.
HLT PRO CIRCULAR PL
Effectively remove unwanted reflection from non metallic surface such as glass and water. CP glass are coated with broadband anti reflection coating to further increase light transmission while removing reflection. Also commonly used to increase colour saturation and contrast when taking pictures under bright sunny conditions.
Available Diameter
6 Layers Anti Reflection Coating
Water Repellent Coating
Front Threads
Maximum Height
(exclude external threads)
Black Coating on Glass Edges
Compatibility with Wide Angle Lens
HLT UV LENS PROTECTOR
52mm to 77mm
Yes
Yes
Yes
3 mm
Yes
Yes
HLT UV (O) CUTOFF
52mm to 77mm
Yes
-
Yes
3 mm
Yes
Yes
HLT CIRCULAR PL
52mm to 77mm
Yes
-
Yes
3.5 mm
Yes
Yes