Harold Gough wrote:I have just examined my Olympus m4/3 and OM cameras and lenses. In both cases the red dot on the camera body is at about 10 o'clock on the camera flange. Also, the red dot on a lens/adapter/tube is at 12 o'clock when locked on. This also applies to my M42 to OM adapter (the one without the rear correction lens).
OK, that's what I'd expect.
But here's my question again, in more visual terms.
On the left is my just-delivered M42 to four-thirds adapter. On the right is a Olympus bellows lens. Green marks the location of the stop pin. Red points to the red dot. Blue points to the new mark I had to make on the four-thirds adapter, to play the role of matching against the red dots on the front of the bellows. Orange marks the location of what looks like a locking slot in the new adapter, completely missing on the bellows lens.
The question I have is whether the four-thirds adapter accurately represents the configuration of a four-thirds lens, or whether there's something odd about this adapter.
Adding some information, I checked the configuration of the new four-thirds adapter against my older no-name no-spec adapter. They match, except for what seems to be some difference in manufacturing tolerances that lets the new adapter mount without difficulty while the older adapter is fiddly to get inserted. The older adapter seems to be a completely independent design, so I'm thinking that the adapters are both four-thirds and that indeed the four-thirds mount differs from the OM mount in the relationship between the red dots and the tabs & stop pin.
I don't know anything about the micro-four-thirds mount.