INON
UWL-100 M67 wide-angle converter
![uwl100](pics/wcon_inon/uwl100.jpg) |
Depth rating 60 m (lens has sealed internal air-spaces).
Achromatic afocal wide-angle converter with anti-reflection coatings
front and back.
Magnification factor: ×0.57077
Max.
coverage: 100° UW, 158° in air (when camera lens 35mm
equiv: focal length is 31.5 mm). Actual coverage depends on camera and
housing - see tables below.
Vignetting
is likely occur when camera 35 mm equivalent focal length is less than
31.5 mm. Zoom in to eliminate this effect. |
Construction: 5 elements, 4 groups,
optical glass.
Dimensions: 100 mm dia., 58.5 mm long.
Weight: 625 g in air, 370 g UW.
Test Pictures: f/8 (35 mm equiv. f = 35 mm - Taken using
Olympus C-5050)
Test Pictures: f/3.1 (35 mm equiv. f = 35 mm - Taken using
Olympus μ410)
![uwl100dp](pics/wcon_inon/uwl100dp.jpg) |
Dome
Port for UWL-100
Depth rating 60 m.
Fits onto
UWL-100 and forms sealed air cavity in front of lens.
Increases max.
coverage to 131° underwater (when camera lens 35 mm equiv.
focal length is 31.5 mm). Actual coverage depends on camera and housing
- see tables below.
Materials: Optical glass dome with
internal multiple anti-reflection coating. Anodised Al body.
Dimensions /mm: major diameter:
129.6. length: 48.9 dome unit only, 85.5 with UWL-100.
Weight: 498 g dome unit only (air).
587 g with UWL-100 underwater. |
Test Pictures: f/8 (35 mm equiv. f = 35 mm - Taken using
Olympus C-5050)
INON UWL-100
M67 Coverage
![](../objects/diag.gif)
Angle of coverage
refers to format diagonal with main camera lens focused at infinity.
![](../objects/cov.gif)
Coverage underwater
with dome lens is less than coverage in air because water filling the
space between the housing port and the UWL-100 rear element increases
the effective focal length of the camera lens.
Camera
lens |
Coverage
with UWL-100 |
35 mm
equiv. focal length (f35) |
Coverage |
UW (α') |
Air |
UW
with dome |
31.5 mm |
68.9° |
100.5° |
158.4° |
131.6° |
37.0 mm |
60.6° |
91.4° |
144.9° |
127.9° |
37.8 mm |
59.5° |
90.1° |
141.1° |
125.0° |
38.4 mm |
58.8° |
89.3° |
139.1° |
123.4° |
42.9 mm |
53.5° |
82.9° |
123.7° |
111.3° |
calculations based on m=0.57077 when UWL-100 rear element is immersed
in water.
Coverage UW (without dome lens):
α' = 2 Arctan[ 43.266615 / (2 m f
35) ]
where f
35 = 35 mm equiv. focal length in mm, and
m (magnification) = 0.57077.
Vignetting vs
focal length
Note: picture cutoff region is normally dark but has been masked in
grey to make it visible.
Pictures taken using Canon S100 in ikelite housing. Aperture
= f/8. Focal lengths given are 35 mm equivalent. The dome port was not
fitted.
Note that chromatic aberration is worse with the S100 than it is with
the C-5050 and μ410 cameras. This is because the S100
5× zoom lens forces the housing manufacturer to
place the port about 25 mm away from the lens entrance pupil at the
wide setting. Best results will be obtained when using a fixed focal
length main lens, or limited-range zoom, with the port close to the
front of the lens.
![](../../general/objects/sq_k.gif)
DWK
![](../../general/objects/dot_info.gif)
Radial corraction data for the UWL-100 (with and without dome adapter) are given in the
M67 adapter comparison article.
Pictures by David Knight & Steve Knight.
© David W Knight 2004, 2012, 2018.