Lens code for new APO 50 f/2??? Confusion???

[k-hawinkler]

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In a way to me it seems to be a mute point whether framelines are displayed in the M-240's rangefinder window when a non-rangefinder coupled adapter is attached. As it's non-coupled the parallax adjustment isn't operative. Furthermore for large lenses attached, that window's view is substantially blocked. So, in this case the rangefinder window cannot be used for either framing or focusing. In this situation the M-240's rangefinder window might as well not display framelines at all.

 

So, just for fun, I checked out which frame lines my M9 displays when various adapters are being attached.

 

To get a base understanding:

Lever in the outward position displays framelines for 35 and 135 mm focal lengths.

Lever in the vertical position displays framelines for 50 and 75 mm focal lengths.

Lever in the inward position displays framelines for 28 and 90 mm focal lengths.

 

When no lens or adapter is attached the lever is in the outward position.

Furthermore the coupling pin at the top is positioned as outward as possible, corresponding to close focus.

As one pushes that pin in, frame lines move from lower right to upper left.

Pushed all the way in seems to correspond to infinity focus.

 

Now, let's see what happens when I attach 5 different adapters to the M9:

 

• NOVOFLEX LEM/LER adapter attached, lever in vertical position.

• NOVOFLEX LEM/NIK-NT adapter attached, lever in vertical position.

 

• Fotodiox LR-LM adapter attached, lever in outward position.

 

• No Name Nikon-LM Japan adapter attached, lever in vertical position.

• No Name Nikon(G)-LM adapter attached, lever in outward position.

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[01af]

In a way to me it seems to be a mute point whether framelines are displayed in the M-240's rangefinder window when a non-rangefinder-coupled adapter is attached.

It will become important as soon as you want to provide a 3rd-party R adapter with the 6-bit pattern 110111 on the bayonet flange, in order to get access to the M's lens menu for the R lenses (which cannot be called manually). Then it better selects the same pair of framelines as the original Leica R Adapter does.

[k-hawinkler]

I don't see the connection to frame lines.

[Photon42]

101001 - the code provided in La Vida Leica - lens codes seems wrong.

[Gobert]

22 minutes ago, Photon42 said:

101001 - the code provided in La Vida Leica - lens codes seems wrong.

Interesting answer to a post of 9 years old.