Aug 28, 2026 · 25 min · 13 segments
Send us Fan Mail 🎙️ Your 50mm lens isn't really a 50mm lens — and once you know why, you'll never buy a lens with the wrong expectations again. In…
I know, it's hardly the most exciting three syllables in photography, is it? But it is important.
If you own a camera, and I'm guessing that you do, and if you don't, you might be thinking about it, so it's equally important.
It might sound like the kind of thing that only engineers and camera geeks care about, like me.
You'll buy lenses more confidently, and you'll stop being surprised by how your photos turn out.
Sounds good, doesn't it? But you really do need to understand this, so let's get into it.
Now, remember that film camera I talked about in the beginning? You don't expect this to be relevant, but it really is, which is still a surprise to me.
And don't worry, if you've never shot a single frame of film in your life, that's fine.
I know, it's hardly the most exciting three syllables in photography, is it? But it is important.
If you own a camera, and I'm guessing that you do, and if you don't, you might be thinking about it, so it's equally important.
It might sound like the kind of thing that only engineers and camera geeks care about, like me.
You'll buy lenses more confidently, and you'll stop being surprised by how your photos turn out.
Sounds good, doesn't it? But you really do need to understand this, so let's get into it.
Now, remember that film camera I talked about in the beginning? You don't expect this to be relevant, but it really is, which is still a surprise to me.
And don't worry, if you've never shot a single frame of film in your life, that's fine.
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