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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 29 Jan 2013 (Tuesday) 05:19
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Why are 24mm and 28mm primes made? Why not just 24 or 28?

 
photosurgeon
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Jan 29, 2013 05:19 |  #1
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Why are 24mm and 28mm primes made? Why not just 24 or 28?

Just a simple question and hoping for a few concise responses.

Can 4mm really make a difference on the wide end?
It just seems like a tough choice when choosing between two of these close focalled lenses.

Appreciate your thoughts.


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Jan 29, 2013 05:57 |  #2

I think (pure speculation) it has something to do with speed (aperture) and cost...

Back in the FD days the inexpensive wide was a 28 f2.8 and the 24 was available at f2 for a bit more money if I recall...

Of course not knowing for sure, I could have said something entirely off subject and not necessarily been more wron...




  
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Kolor-Pikker
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Jan 29, 2013 07:00 |  #3

Lenses have whatever focal length that is appropriate for the optical formula used, long ago one saw "normal" primes range 50 to 58mm, though Zeiss is currently working on a 55mm f/1.4 prime.

Similarly, you have lenses that range from 24-28mm because there are some trade-offs that make or the other better, 28mm's are historically cheaper.

To be honest, no one really knows the precise focal length of lenses or even the aperture, a 50mm f/1.4 might be 51mm t/1.6. A t-stop (transmission stop) is the measurement of how much light actually goes through a lens, versus how much is supposed to... f is just a ratio of the focal length and aperture, but it doesn't take into account the transmissive properties of glass.


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kent ­ andersen
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Jan 29, 2013 07:16 |  #4

the main reason is, becouse Canon still manage to sell both.

becouse 24mm fit some, 28 fit others need. It mybe is close to nothing for most people, for others it is the difference that they need for their purpose.

On a ff, those 4mm do make a difference.


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nomkcalb
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Jan 29, 2013 12:46 |  #5

There's a pretty big difference between the two. If you click on this link (external link) and scroll down a little there's a comparison between the two focal lengths.




  
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noisejammer
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Jan 29, 2013 14:57 |  #6

If you play in Zeiss-land, you get to choose between 25/2 and 28... which really starts to sound redundant and yet, these lenses are different. (I'll ignore the ZF 25/2.8 which is really a 26 mm lens...)

I learned SLR photography with a 28 mm lens, then found a special on a 24 mm Zuiko with which I trudged over many, many mountains. Zoom forward 30 years and my 28 mm was my natural choice when I purchased a 5D2...

Then one day I had an urge to try the new uber wunderbar Zeiss 25 mm, and did. Now my camera bag is too damn heavy to lift.


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Wilt
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Jan 29, 2013 19:24 |  #7

74 degree diagonal AOV is very, very different than 84 degree diagonal AOV.

when I was in Europe with 28mm, I was very unhappy; when I went back to Europe with 24mm, I was content.

In shooting photos with groups of poeple, with 24mm on FF camera I can easily induce perspective distortion, making the closer people loom larger (and more corpulent) in the photo than folks farther away...the fat lady appears even fatter! I can't easily induce perspective distortion with 28mm on the same camera.


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photosurgeon
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Jan 29, 2013 19:28 |  #8
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Thanks for all your time and thoughts. They are much appreciated.

I have also done some research to find that 24mm is probably more expensive to manufacture, hence there being a 28mm alternative.

My Camera will soon be a Canon 5d mk2, so it is a full frame contemplation.
Will let you know how I get on when I have it all setup.

I am picking up a Tamron 28-75 2.8 this Sunday for just £125!


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Jan 29, 2013 20:19 |  #9

kent andersen wrote in post #15547278 (external link)
the main reason is, becouse Canon still manage to sell both.

becouse 24mm fit some, 28 fit others need.

This is it in a nutshell. Canon sells both and so it continues to make them. People want one or the other (or both) because, while it may not sound like much, 4mm at the wide end of the scale makes a fairly substantial difference.


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les24preludes
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Jan 30, 2013 10:18 |  #10

On a cropped body the equivalents of 38mm and 45mm look fairly different.




  
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Tom ­ Reichner
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Jan 30, 2013 10:29 |  #11

Wilt wrote in post #15549947 (external link)
74 degree diagonal AOV is very, very different than 84 degree diagonal AOV.

when I was in Europe with 28mm, I was very unhappy; when I went back to Europe with 24mm, I was content.

Exactly this. 4mm does make a heck of a difference when you start to get to the wider angles.

When I shoot my 24-105 at 24mm on my full frame, the vignetting is terrible - I mean absolutely atrocious. When I zoom in to 28mm, the vignettng is completely gone . . . but I've also chopped off quite a bit of the scene I wanted to capture. Big, big difference.


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CanonCameraFan
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Jan 30, 2013 14:43 |  #12

Another thought is that it has to do with the history of Lens manufacturing. As time goes on (many decades) and technology in manufacturing improves, wider lenses get produced. But industry standards do get created, even if "de facto" in nature. Hence, keeping the expected 35, 28, 24, 20...by many suppliers.


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eelnoraa
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Feb 01, 2013 03:07 |  #13

I bet people who own 24mm, won't have 28mm, or vice versa.

But have that said, instead of asking why Canon make them, a better question is why people buy them. Canon is out there to make money. For enough profit, they will make 25mm too.


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noisejammer
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Feb 01, 2013 12:10 |  #14

eelnoraa wrote in post #15559000 (external link)
I bet people who own 24mm, won't have 28mm, or vice versa.

But have that said, instead of asking why Canon make them, a better question is why people buy them. Canon is out there to make money. For enough profit, they will make 25mm too.

Um... no
I have a 24/2.8, 25/2, 28/2.8 and 28/2. Ok, so these are spread over Zuiko OM and Zeiss but they all fit my cameras. My favourite is the ZE 28/2.


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Feb 01, 2013 18:01 |  #15

4mm on the wide end is a huge difference. It feels almost the same as a 50 vs an 85mm lens.

24mm on full frame is special, because the focal distance equals the height of the sensor.

And IMHO 28mm is the cheaper 24mm. 28mm is easier to build as a retrofocus lens and is much too close to 35mm to be redundant.

If I were to shoot a set of primes, I'd go with a 50, then a 35 and then I'd go with a 21 or 24 depending if it's a rangefinder or SLR. 28mm is a very generic wide angle. There's not enough wide distortion to make an image exciting, but it's still wide enough to make composition more challenging.

On the other hand if I wanted less drama in my shots and cover most of it with just two lenses, a 50 and a 28mm combo is totally bombproof for travel and many people shoot just with those two lenses.


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Why are 24mm and 28mm primes made? Why not just 24 or 28?
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