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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 11 Sep 2018 (Tuesday) 06:38
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Normal lens on crop sensor cameras

 
mcoren
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Sep 11, 2018 12:39 |  #16

What is "normal" depends on your need. ;-)a

To paraphrase what John from PA said, divide the focal length you are using on a full frame body by 1.6 to get the focal length that will give the same FOV on a crop camera.

Conversely, multiply the focal length you are using on a crop body by 1.6 to get the focal length that would provide the same FOV on a full frame body.

Example: 50mm is usually "normal" for a full frame sensor. Put it on a crop body, and it will give the same FOV as 80mm on a full frame body, which is a short telephoto. 50 x 1.6 = 80.

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Tommydigi
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Sep 11, 2018 12:51 |  #17

I too was a fan of the 28 1.8, I dumped it when I got the 24LII which is my favorite lens to use on crop. I'm also a fan of 50 on full frame. I think of either as great practical options and I tend to use these 2 most often so I would look at any of these: 24 pancake or 24 2.8 IS, 28 1.8, 35 2.0.


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davesrose
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Post edited 6 months ago by davesrose. (3 edits in all)
     
Sep 11, 2018 13:21 |  #18

soeren wrote in post #18705656 (external link)
Yes but that was actually later than the fixed lens 35mm cameras and the reason for 50mm was not it being considered the normal lens but because it was an easy and cheap design (2in)

It was Oskar Barnack of Leica that popularized 50mm as "normal" focal length (Leica 1A from 1925 had 50mm lens). At the time, my Canon 50mm FD f1.4 wasn't cheap. My point was that wide angle lenses didn't get as wide as they do now, so that the 28-35mm range was considered wide angle on film SLRs.


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Bassat
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Sep 11, 2018 18:22 |  #19

Small, light, fast, sharp? EF 28mm f/1.8 USM, and EF 35mm f/2 IS USM. My 'normal' lens on my 80D is the 18-135 USM. Not fast, but fantastic.




  
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duckster
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Sep 11, 2018 21:57 |  #20

I have borrowed a 17-55mm f2.8 a couple of times. Makes a pretty good basic lens if you also need a faster lens




  
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RodS57
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Sep 12, 2018 10:43 |  #21

Funny, much reading in years gone by lead me to believe that the 'normal' lens approximated the magnification of the human eye with 50mm being a convenient close enough lens. If this accurate then FOV does not play a part in the definition and a 50mm will be normal. With a normal lens you do not get the stretching effect of wide angle nor the compression effect of telephoto.

Now I could be wrong too. :-)

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Wilt
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Sep 12, 2018 10:54 as a reply to  @ RodS57's post |  #22

the magnification of the human eye is rather meaningless in the context of the viewfinders, since viewfinders come in various magnifications depending upon camera model... the magnifications range from 0. 7x to about life-size, all within 50mm normal mounted.
Furthermore, in history lenses for the 135 format have ranged from about 40-58 mm, all considered 'normal'


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Sep 12, 2018 18:15 |  #23

I once conducted a test of what is seen with the naked eye, compared to a FF or APS-C frame's content when printed to 8" height (x12" width). I also viewed the same image on a 24" monitor.

It seems that with about 60mm on FF or 38mm on APS-C, what is framed by the camera and later printed to 8" tall print (viewed at arm's distance) or viewed on a 24" monitor while working in Lightroom's Develop module will appear very close to the apparent size seen by your naked eyes for a single frame.

The post, with FF
https://photography-on-the.net …showthread.php?​p=18339747

The post showing photo results with APS-C body...
https://photography-on-the.net …showthread.php?​p=18342810


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Sep 13, 2018 01:28 |  #24

I would say 28~50mm on a Full Frame is normal for me.
For crop, that would be like 18~35mm.

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Sep 15, 2018 12:46 |  #25

If you take normal as the diagonal of the format, and use that focal length of lens, you then need to make an uncropped print, and view from the same distance as the diagonal of the print. If you do that what you see in the print would seamlessly match reality with the print placed in the same place as the camera.

The reason that Wilt's test resulted in the need for a longer focal length was his print viewing distance. An 8×12 print would need to be viewed from 14.42" for the focal length to match the diagonal. View it from a bit further away, i.E. "arms length" and you will need to add a little more magnification to match the view.

Oskar Barnack happened to have a 2" Taylor Hobson lens to hand in his lab, and the rest is history.

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Normal lens on crop sensor cameras
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