The User's Review: Comparison of the Two AF Lenses with the On-Lens Auto-Focus System by Chinon

In this post, I put the 'very impossible' and the 'even very impossible' (M. Butkus) side by side, and make it possible to show them for you.

On the ring plates around the front elements, these two lenses are marked as 'Auto Chinon Multi-Coated  1:1.7 50mm Japan 58Ø' and 'Auto Chinon Zoom MC 35-70mm 1:3.3-4.5 Japan', respectively. These marks are confusing because 'Auto' also marked on some of Chinon manual focus lenses. I believe, Chinon's 'Auto' on the these lenses means auto-aperture while the 'AF' signs on the AF system case of the auto-focus lenses indicate auto-focus.

Feature	AF Prime Lens	AF Zoom Lens
Contact pin	No	3 in one line
Focus length (mm)	50	35 – 70
Filter size (mm)	58	52/55*
Lens cap (mm)	58/60	55/62
Switch	1 for both power & beeping	1 for power & 1 for beeping
Aperture ring	Partial covered by AF case	Exposed
Aperture size marks	2 sets on the ring	1 set on the ring
	1.7, 2, 2.8, 4, 5.6, 8, 11, 16, 22	3.3, 4, 5.6, 8, 11, 16, 22
Lighted aperture	Yes	No
Aperture blades	6	6
Focus distance marks	1 (3.5) – ∞ m (ft)	0.5 (2) – ∞ m (ft)
Battery power	3 AAA	3 AAA
Weight (g)	435	660

*The focus ring accepts a 55 mm filter. However, it will block the zoom to be set to 

  35 mm after the filter is installed.