KRL08S
USER MANUAL
KRAKEN KRL08S is a middle range magnification underwater close-up lens which design for SLR photography. It comes with a
+6 Diopter (Underwater) in optical power and allow the close-up shooting with a comfortable working distance 80mm – 160mm
(From the front lens surface).
The maximum magnification is x1.5 (Area Ratio x2.25) when using KRL08S with 105mm macro lens for a full frame SLR system.
The lens is designed by 4 high quality optical glasses. The achromatic doublet inside the system suppress the chromatic
aberration and the multi-elements structure intensely control the spherical aberration at very low level.
All glass lenses have been coated with Broadband Anti-Reflection (BBAR) Coating. Each lens surface is guaranteed to provide
less than 0.5% reflectivity over the visible spectrum (420nm – 680nm).
All lens edges and spacers of KRL08S had been treated by matte black finish. To avoid internal reflection and ghost image.
The M67 X P0.75 thread mount allows the lens mounting directly on the camera waterproof housing with the same female thread
mount. User can also attach the lens with suitable step-up or step-down ring.
It is recommended to use natural light, external strobe or video light with the KRL08S. The camera built-in flash may be blocked
by the lens and causes partial underexposed image.
Install the KRL08S as following steps:
1. Align the lens with the 67mm lens ring on the waterproof housing.
2. Turn the lens in clockwise direction until you feel it is tighten on the housing.
When using an external strobe, avoid the flash beam pointing directly to the lens. It helps to prevent the unwanted ghost image.
Do not impact the lens with large shock and vibrations or try to disassemble it, these will lead to damage or even flood the lens.
Do not place the lens inside an extreme environment for example inside a high temperature car compartment, boiling water or
under direct sunlight. It may damage the sealing parts and eventually flooding.
Do not clean the lens with organic solvent or other chemicals. It may damage and degrade the coating on the lens.
Never look at the sun though the lens.
Attach the lens with appropriate force, improper installation may damage the thread on both the lens and the waterproof housing.
To prevent corrosion, it is recommended to apply small amount silicone grease on the thread area.
Be careful while attaching the lens to the housing. Dust, dirt or any other particles caught on the lens may lead to its damage.
NOTE:
The optical performance of KRL08S is solely designed for underwater photography. Using on land will give unwanted aberration
and shorten the shooting distance.
Vignetting may occur on some camera and waterproof housing. Use the zoom function on the camera and zoom in until the dark
corner disappear.
The thread mount on the lens is possible to remove and would not cause any damage to the lens. But only replace the thread
mount when the thread is worn or bruised.
KRL08S
Underwater Achromatic Close-up Lens
4 elements; 3 groups
Sensor Size: 36mm X 24mm (135mm Full Frame)
Camera Lens : 60mm - 105mm
+6 (166.67mm)
80mm - 160mm (From the Front Lens Surface)
x1.5 (Area Ratio x2.25) with 105mm F2.8 Macro Lens
Optical Glass / Multi-Layer BBAR Coating
Aluminum with Type II Anodizing
M67 X P0.75
Ø 71.9x54mm
396.5g
215g
60m (197ft)
Model
Lens Specifications
Product Description
Lens Construction
Compatible Camera (Up to)
Diopter (Underwater Focal length)
Working Distance
Max. Magnification
Glass / Coating
Lens Barrel
Mounting
Dimension
Weight (Air)
Weight (Underwater)
Depth Rate