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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 30 Sep 2008 (Tuesday) 12:12
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Canon Extension Tube 25 II

 
yankees3791
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Sep 30, 2008 12:12 |  #1

I am wondering what my magnification would be on these three lenses when I add this tube.. 28-105mm f/3.5-4.5, 50mm f/1.8, and 70-200mm f/4L


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iacas
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Sep 30, 2008 12:34 |  #2

yankees3791 wrote in post #6410186 (external link)
I am wondering what my magnification would be on these three lenses when I add this tube.. 28-105mm f/3.5-4.5, 50mm f/1.8, and 70-200mm f/4L

None. Extension tubes don't contain optics - they simply let you focus closer.


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DreDaze
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Sep 30, 2008 12:43 |  #3

iacas wrote in post #6410293 (external link)
None. Extension tubes don't contain optics - they simply let you focus closer.


which will allow more magnification....not sure what just one tube would do...but i think a whole set of kenkos on the 50 gives something like 1.6-1 magnification...i'll search for the formula link

found this one:http://eosdoc.com/jlca​lc/ (external link)

i think there's a simpler one though
https://photography-on-the.net …php?p=5032640&p​ostcount=6
this post explains it as simply extension tube focal length.lens focal length=your magnification

probably not dead on like the other one but a good idea
so you're 50 with the tube would have about a magnification of 1.2 or .5


i think at least...the beauty of these forums is the person that knows for sure is always there to correct


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Willie
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Sep 30, 2008 12:54 |  #4

28-105
0.75 - 0.73 at wide end
0.44 - 0.27 at tele

50
0.68 - 0.53

70-200 (f2.8, not sure if the same for f4)
0.41 - 0.38 at wide
0.30 - 0.14 at tele




  
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Lester ­ Wareham
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Sep 30, 2008 12:58 |  #5

Canon provide a list of magnification and working distance with the tubes for various lenses, a lot of that is reproduced here http://www.bobatkins.c​om …graphy/eosfaq/c​loseup.htm (external link)


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yankees3791
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Sep 30, 2008 13:04 |  #6

thanks for all the responses...i just think that I wouldn't use a macro lens enough to justify the cost so if I buy this it is a lot cheaper and will work for what I do..If I like it enough I might buy a macro lens...thanks again!


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DreDaze
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Sep 30, 2008 13:08 |  #7

i would look into getting the kenko's instead...you can get a full set for about the same price...would give you more magnification on your 70-200, along with working distance(compared to the 50)...and since there's no glass you're not really missing out on anything from canon...unless somehow their air is better...


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Lester ­ Wareham
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Sep 30, 2008 16:05 |  #8

The Kenkos are not as solidly constructed although they look almost identical to the Canon ones, I also had a lot of problems with them coming unlocked accidentally.

To be fair many others are happy with the Kenko.


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Canon Extension Tube 25 II
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