The Riconar 55/2.2 lens has a simplified manual focusing mechanism by moving only the front element instead of the entire lens unit.
The Leica M-Sony FE/E close focus (helicoid) adapter can be used to reduce the focusing distance (see 1 or 2). In the case of the Riconar 55/2.2, however, this adapter (together with the Pentax K-Leica M adapter) allows you to compare both ways of focusing: by moving the front element or by moving the entire lens unit. In the second case, the lens is set to focus at infinity and the close focus adapter is used to focus at closer distances.
This has an unusual effect. Since the position of the optical elements is different when focusing closer than infinity, this results in different image quality and different background blur.
Due to the soft focus, it is difficult to focus with the lens (compared to focusing with the adapter). The focusing distance may be slightly different.
All images were taken with the Sony a7c (FF, 24MP) at f/2.2:
1.
(lens focusing)
(adapter focusing)
2.
(lens focusing)
(adapter focusing)
3.
(lens focusing)
(adapter focusing)
4.
(lens focusing)
(adapter focusing)
5.
(lens focusing)
(adapter focusing)
6.
(lens focusing)
(adapter focusing)
7.
(lens focusing)
(adapter focusing)
The difference is most noticeable at close focusing. Then, lens focusing gives more aberrations (and soft focus), but softer background blur. Focusing with the adapter reduces the visible aberrations, but the background blur looks more like "soap bubbles" (triplet like).
It's like having two different lenses in one.
See also related notes:
Image albums:
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