Inon UFL-165 AD fisheye wide-conversion lens -
Test pictures
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 Max. coverage: 165.5° (underwater use only).
Magnification: ×0.405.
  4 elements, 4 groups. Optical plastic dome with hard coating. Optical glass internals with anti-reflection coatings.
 Depth rating: 60m
Dimensions /mm: 114 diam., 86.5 front to back.
Weight: 440g. (85g underwater).
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Lens designed for use with camera lens focal length f = 35 mm (35 mm equiv.)
Corner detail images have been resized to 2582 × 1937 (5 Mp) before cropping
Tested using
Canon S100 camera in Recsea housing with Recsea AD port adapter.
Vignette normally appears dark, but has been masked in grey to make it visible.
Pano Tools radial corection coefficients (Inon UFL-165 AD + Canon S100 camera)
| f |
a |
b |
c |
d(red) |
d(green) |
d(blue) |
Δd(red) |
Δd(blue) |
| 24 |
0.3 |
-0.74 |
0 |
1.4415 |
1.44 |
1.4395 |
0.0015 |
-0.0005 |
| 28 |
0.13 |
-0.39 |
0 |
1.2615 |
1.26 |
1.2595 |
0.0015 |
-0.0005 |
| 35 |
0.06 |
-0.22 |
0 |
1.1615 |
1.16 |
1.1595 |
0.0015 |
-0.0005 |
| 50 |
0.02 |
-0.1 |
0 |
1.0815 |
1.08 |
1.0795 |
0.0015 |
-0.0005 |
Star performance
Although this lens was designed for cameras having a minimum 35 mm
equivalent focal length of 35 mm, it is relatively unaffected by the
large distance from back element to camera entrance pupil which is
imposed by cameras (such as the S100) having a wide-range zoom. Hence,
although it becomes necessary to zoom-in to f=35 mm to eliminate
vignetting, the results can nevertheless be used at high magnification
without the need for additional correction. This is an excellent lens.
David Knight
Pictures by Steve Knight
© David W Knight & Stephen D Knight 2012, 2018
