Notch that triggers framelines?

[Ron (Netherlands)]

Can someone tell where the notch is on the M-adapter that triggers the viewfinders framelines, or are they triggered by a different mechanism?

thanks

 

[EmilGil]

I'd say it is the leftmost of the four flanges on your image. Compare with this P.net thread.

 

[Ron (Netherlands)]

I'd say it is the leftmost of the four flanges on your image. Compare with this P.net thread.

Thanks for the fast and clear answer

 

[peterm1]

As I have always understood it, its the position of the curved notch at the top of your photo. (Same as for a lens) They have a slightly different position for each frameline. I may be wrong but am sure that if I am I will be corrected quickly.

EDIT OK I stand corrected

 

[pvdhaar]

Here you go, the adapters for 35/135 and 28/90 respectively. You can see how little they differ in the frameline selector notch. The 50/75 is somewhere in between..

 

[Ron (Netherlands)]

Here you go, the adapters for 35/135 and 28/90 respectively. You can see how little they differ in the frameline selector notch. The 50/75 is somewhere in between..

Thanks pvdhaar. Could you send me a larger picture over by email: cameraobscura@xs4all.nl

thanks again