What makes a lens long?

Started Feb 17, 2014 | Discussions thread
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laban77 Junior Member • Posts: 34
What makes a lens long?

I'm quite new to the world of exchangeable lenses, having had only compact cameras until now. I got myself a gm1 and then started to ask myself questions about the size of lenses...

What makes a lens long?

It's not the speed. I have see fast and relatively compact lenses. It's not the focal length. There are lenses out there with both very wide and narrow angles. So what is it?

Now that I think of it I haven't seen any flat (pancake) narrow angle lenses. Would that be impossible? Or perhaps just very expensive?

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