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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 23 Jun 2008 (Monday) 17:53
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What is all these numbers?

 
izzy35
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Jun 23, 2008 17:53 |  #1

While looking at lenses i ALWAYS find myself with a migraine!!! What are ALL THE NUMBERS attached to the len names??? Seriously, what do they ALL mean?? I went to B&H and asked 1 question, and totally got ridiculously confused!!! I asked about the Canon 28-135 as an all around lens and the guy spitted out 1000 numbers and facts about what makes the 17-85 better and multiplying times 1.6, and f-this f-that..TOTALLY wanted to puke when i left there...

So a bit of help learning the basics would be nice...:D


Canon Xti | Canon EFS 18-55 (Kit Lens) | Canon 70-200 f/4L IS

  
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TaDa
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Jun 23, 2008 18:07 |  #2

They mean the minimum aperture of the lens. Probably one of the most important things to consider when buying a lens.

I'd strongly recommend you picking up the book "Understanding Exposure" by Bryan Peterson


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Quad
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Jun 23, 2008 18:10 |  #3

The number expressed in mm as in 38-145 mm is the focal length range (wide tele settings). The second set of number the 3.5-5.6 following are the largest aperture at the respective focal length. ie at 38 it's largest aperture is f.3.5 they go to smaller aperture's as well but that is the most light you can let in. These are fractional numbers so 1/3.5 is a larger number and aperture than 1/5.6, we just say it is a 3.5 lens so a fast lens (lots of light let in) is f1.4 a slow lens is f 5.6.




  
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breadandbutter
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Jun 23, 2008 18:14 |  #4

I guess the best place to start would be lenses 101.

http://www.usa.canon.c​om …ml/EFLenses101/​index.html (external link)


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x.pozhr
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Jun 23, 2008 18:18 as a reply to  @ TaDa's post |  #5

Yes, this can be very confusing. I think you need to read and discover what all these numbers mean. Perhaps, start here:

http://digital-photography-school.com/blog/ (external link)

or here:

http://www.the-digital-picture.com/Canon-Lenses/ (external link)

Remember, there are countless sites on the internet you can go and educate yourself. That's what I did when I started out; heck, I am still doing it. The best way to learn is self-education.

Have fun.


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LoremIpsum
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Jun 23, 2008 18:50 |  #6

Canon make point and shoot you know. Why bother your self with these numbers. :)


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ddphotography
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Jun 23, 2008 18:52 |  #7

great thread




  
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dcsmith40D
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Jun 23, 2008 18:55 |  #8

I can remember when I first got my camera and was looking for a lens to buy. I noticed the smaller the f number the bigger the $ number. So I deduced that small f numbers must be good (why I didn't know). I also noticed if the lens description included an L it had a bigger $ value. I have done a lot of reading since then. I couldn't tell you yet why the L is a big deal. However, I bought into it. Oh yeah, I learned to like "IS" in the description too.


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Mum2J&M
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Jun 23, 2008 19:00 |  #9

https://photography-on-the.net/forum/showthre​ad.php?t=414088


Cleo
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What is all these numbers?
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