The Kiyohara Kogaku (KOPTIC) VK70R is a 70mm f/5 soft lens.
The optical design is 2 elements in 1 group. Overall, the lens is an homage to a Vest Pocket Kodak's lens (with the hood removed to make it faster and softer).
There is no distance scale on the focus ring, only a few unnumbered marks. The lens focuses beyond the infinity at the hard stop.
The 12-blade aperture is located in front of the optical group. The clickless aperture ring is located at the front end.
When a filter is mounted (to the 49mm thread), the aperture ring becomes inaccessible. Another oddity is that the aperture ring rotates beyond the marked f/5–f/11 range.
My copy has a Nikon F mount, but other mounts were available.
See also related notes:
- Kenko Soft 45/4.5: 45mm soft focus lens (2025-09-03)
- Kiyohara Soft VK70R 70/5: Samples [1] - FF - f/5 (2025-08-03)
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