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"....Will a 120mm image have the same angle of view on all three systems?..."
Yes - exactly ! Focal length is focal lenght.
Maybe to clear this you should get an app for iPhone which explains this quite good: It´s called angle of view. Highly recommended !
Regards
Stefan
"...Yes focal lenght is focal lenght but the angel is these 3 images will NOT be identical.....
because a marked 120mm lens normally is allowed to differ +- 10% by Iso in focal length !!! Zeiss for example limits their lenses to 5 % but this means unless you got "matched" equal focal length exemplars you might even end up with different image sizes using 3 of the same lenses on the same body !!!
Regards
Stefan
Hi Erik
Try it and measure it. You will be astonished......
I had to learn it the hard way, as we once had a customer who bought 2 of our 40mm lenses to use them on a book reproduction system. It didn´t work, because the cameras were mounted exactly on same mirrored positions and the lenses were NOT identical and more than a little.
The reply of Zeiss is what I told you in the last post.
For all complex lenses which are calibrated at mounting this is the same.
The one exception that I know of are the newer Canon lenses like the 17mm and 24mm TS-E which use pressed aspherics.
Greetings from Germany
Stefan
Hi,
OK, I am astonished and stand corrected!
Best regards
Erik