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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 26 Sep 2011 (Monday) 01:36
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How far is infinity?

 
texshooter
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Sep 26, 2011 01:36 |  #1

I auto focused on city skyscrapers from 7 miles away on a hill. I was expecting the lens to rotate to its maximum. 7 miles seems like infinity to me. But the focus distance as shown in the little window on the lens did not go to the very end; I could twist it a smidgen more after the camera finished focusing. I tried focusing on the clouds, which are surely infinitely away, and still the same thing, just a little closer to the maximum swing. So how far is infinity on the lens if even clouds are not? Also, you'll notice on the Canon 24-70mm lens focus window that the infinity symbol is coupled with an L shaped white marker. What does this mean? When manually focusing in the past, i had always rotated the focus ring all the way to the end, but now i know better. To getter best focus when shooting mountains etc, I need to align the focus ring on the tip of the L mark in the focus window instead of rotating it until it stops. Can someone explain what is going on here?




  
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TwoWheelMotion
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Sep 26, 2011 01:45 |  #2

This was taken out of the 24-70 manual, and should explain it for you.


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rvdw98
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Sep 26, 2011 07:16 |  #3

By definition, nothing is as far as infinity. :)


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rick_reno
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Sep 26, 2011 09:13 |  #4

I don't know, but I do know Buzz Lightyear could go to it and beyond.




  
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Raylon
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Sep 26, 2011 09:22 |  #5

I believe most lenses allow you to focus past infinity, that is the little extra you are noticing at the end.


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Sep 26, 2011 09:59 |  #6

rick_reno wrote in post #13164691 (external link)
I don't know, but I do know Buzz Lightyear could go to it and beyond.

:lol::lol:bw!


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magwai
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Sep 26, 2011 10:00 |  #7

I thought the same for the moon, but even that wasn't at max focus




  
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Higgs ­ Boson
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Sep 26, 2011 10:06 |  #8

Infinity is the back of your picture.


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RafaPolit
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Sep 26, 2011 10:38 |  #9

rick_reno wrote in post #13164691 (external link)
I don't know, but I do know Buzz Lightyear could go to it and beyond.

bw! Book Worthy indeed! :)


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jwp721
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Sep 26, 2011 11:35 |  #10

Higgs Boson wrote in post #13164932 (external link)
Infinity is the back of your picture.

No it is just a little past that, and past that, and past, that...... ;)

My first slr camera over 25 years ago also had the infinity compensation mark on the lenses. So this is really nothing new...




  
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texshooter
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Sep 26, 2011 21:37 as a reply to  @ jwp721's post |  #11

So if there is compensation for infinity, does that mean all focus distance marks also have compensation? Temperature should affect the whole lens, not just the infinity mark, but there is no mention of that in the manual.




  
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phreeky
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Sep 26, 2011 21:58 |  #12

texshooter wrote in post #13168107 (external link)
So if there is compensation for infinity, does that mean all focus distance marks also have compensation? Temperature should affect the whole lens, not just the infinity mark, but there is no mention of that in the manual.

You only need compensation at the ends of the focal range. i.e. if there was no ability to go "beyond infinity", then under certain circumstances it might actually be impossible to focus at infinity.

The other focusing distances don't matter because the markings are just estimates anyway. Don't rely on them too much.




  
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Frugal
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Sep 27, 2011 00:11 as a reply to  @ phreeky's post |  #13

if there was no ability to go "beyond infinity", then under certain circumstances it might actually be impossible to focus at infinity.

Exactly


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steve40
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Sep 27, 2011 00:20 |  #14

Infinity, is infinitely very infinite. In other words, it is beyond a very long distance. :)


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nikmar08
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Sep 27, 2011 00:34 |  #15

The distance scale should be only used as an indicator; the reliable method of focussing is to use the hyperfocal distance mechanism with live-view zoomed 10x times e.g. in MF.


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How far is infinity?
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