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what does "front to flange" mean, lengthwise?


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#1 Haris Mlivic

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Posted 04 June 2015 - 03:44 PM

I've seen in several times when referring to the length of a lens. What distance is that exactly?

 

Example from the a Schneider Xenon 18mm Lens:
Full Length: 133 mm

Front to Flange: 122mm

Does anybody know?

 


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#2 Brian Drysdale

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Posted 05 June 2015 - 03:08 AM

What I take is that the full length is the overall length of the lens from end to end (I assume when focused at infinity), while front to flange is  from the front to the flange on the lens mount i.e. how far the lens will stick out from the camera.


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#3 James Martin

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Posted 05 June 2015 - 10:28 AM

That is my understanding also.


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#4 Haris Mlivic

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Posted 28 June 2015 - 10:52 AM

Ok cool, that's probably it, thanks guys!


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