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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 05 Mar 2012 (Monday) 11:15
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Extension tube+100mm Macro?

 
Etherealdc
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Mar 05, 2012 11:15 |  #1

I have absolutely no experience with extension tubes. The way I understand it, they add magnification to a lens by making them longer? Anyway, I have an EF 100mm 2.8L Macro IS USM; love it, great quality, but... I want to get closer/larger with it... it's cool for an eye to fill up the picture--but it's a LOT cooler to have an iris filling the picture ;) So, I found these Kenko extensions (external link) on Amazon... wondering, first of all, will they work with my EF lenses? And second, are these quality extensions? Does anyone have any examples of what they'll actually do with a macro?

Thanks, and I apologize if these are very stupid questions :)


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bpark42
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Mar 05, 2012 11:40 |  #2

The Kenko tube set is good quality and they should work fine with your 100L.

There is a fairly simple formula for calculating the effect on max magnification. It essentially looks like X/focal length where X is the total extension. So assuming the 100L is actually 100mm at max magnification (may not be a valid assumption, but I'll leave it to you to check on this), if you added (e.g.) the 20mm tube, you would have a max magification of 1.2:1. If you added all three tubes you would have 1.68:1.

A couple things to keep in mind:

1.) The tubes cause additional light loss, making natural light shooting even more difficult.
2.) Your focus range is significantly reduced once you add tubes. You will not be able to focus anywhere near infinity with the tubes in place.




  
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mattmorgan44
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Mar 05, 2012 11:44 |  #3

I bought the keno extension tubes to go with the exact same lens, the 100mm L Macro. The extension tubes will fit all EF and EF-S lenses. As there is no glass at all in these tubes there is not much reason to choose the more expensive Canon equivalent.

The only small issue I have is it isn't perfect fitting. It is very good, just not perfect. Mine rotates ever so slightly left and right between the camera and lens but it is a very very smal amountl.

My cousin just bought a no name brand 3 x extension tube kit off eBay and they feel excellent and fit better than mine and they were $8 for the set of three!!! They have absolutely no rotation and feel solid as a rock. What you are paying for with Kenko/Canon are the electrical contacts that allow your body to communicate with the lens (for auto focus, and for aperture adjustment 'on the fly'). If you will always be using manual, I would definitely buy the $8 set off eBay.

Hope this helps

Edit: bPark42, why would there be any light loss? I don't see any vignettimg in my pictures even with all three tubes attached. The min/max focus distances indeed become very very small.


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paddler4
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Mar 05, 2012 11:48 |  #4

they work fine with Canon lenses. I'll post two examples.

100mm + 36mm extension:

IMAGE: http://dkoretz.smugmug.com/Bugs/butterflies-damselflies/i-DscQRD3/0/L/MG7252-L.jpg

60mm + 68mm extension:

IMAGE: http://dkoretz.smugmug.com/Bugs/Bugs/MG2234/720619865_AtrbV-L.jpg

Check out my photos at http://dkoretz.smugmug​.com (external link)

  
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mattmorgan44
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Mar 05, 2012 11:49 |  #5

#2 Yuk yuk yuk lol.

Nice photo #1 :)


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Etherealdc
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Mar 05, 2012 12:16 as a reply to  @ mattmorgan44's post |  #6

Those are some excellent photos! Thanks for sharing! Does anyone besides matt have anything to say about the cheap-o extension sets? I'm also looking at these Zeikos (external link); I mean, between these and the Kenko, am I paying for build quality? Fit? The reviews on Amazon are so schizophrenic that I can't make heads or tails of them.


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Tommydigi
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Mar 05, 2012 12:18 |  #7

I use the Kenkos and they do work well with the 100mm macro. Its amazing how much closer you can get.

This is a tiny rollie pollie bug.

IMAGE: http://farm7.staticflickr.com/6010/5968347030_2d72db5bd7_b.jpg
IMAGE LINK: http://www.flickr.com …/49877689@N04/5​968347030/  (external link)
Rollie Pollie (external link) by Tommy DiGiovanni (external link), on Flickr

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DreDaze
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Mar 05, 2012 12:20 |  #8

the kenko mounts are metal...usually the cheaper brands are plastic...you want to make sure you get one with the contacts it makes stopping down the lens way less of a pain

this shows how much closer you can get with tubes, and other methods:
https://photography-on-the.net/forum/showthre​ad.php?t=578274


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bpark42
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Mar 05, 2012 12:28 |  #9

mattmorgan44 wrote in post #14028087 (external link)
Edit: bPark42, why would there be any light loss? I don't see any vignettimg in my pictures even with all three tubes attached. The min/max focus distances indeed become very very small.

Less light strikes the sensor as the lens is moved farther away. The effect is as if the aperture has become smaller. In other words, for a "real" f-stop of f2.8 there may be an effective f-stop of f5.6 (or whatever, depending on the actual amount of extension.)

Note that this happens even without tubes. As you take a lens like the 100L from infinity to 1:1, the effective aperture is reduced (I am too lazy to do the math, but I believe you lose close to two stops.) I think Nikon cameras actually calculate and display the effective f-stop though Canon cams do not.




  
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pulsar123
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Mar 05, 2012 14:05 |  #10

You may want to consider twice cheaper (70$ for all-metal) extension tubes with AF/aperture control from ebay. I just ordered them myself, should get them soon.

http://www.ebay.ca …ories&hash=item​3a6ffc15ee (external link)

With my non-macro 135L, adding the three tubes will increase the magnification by 3.7x.


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Etherealdc
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Mar 05, 2012 17:36 as a reply to  @ pulsar123's post |  #11

Those look pretty dang solid, pulsar; please let us know what you think once you get them and have been able to play around :)


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PUREBRAD
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Mar 05, 2012 19:01 as a reply to  @ Etherealdc's post |  #12

Can anyone comment on how an extension tube affects depth of field. I just bought the 100L to shoot some jewelry for a customer (I've never done any macro work before) and I am struggling photographing rings. The depth of field required to get both the face of the ring and the inside of the rear shank in acceptable focus requires me to stop the lens all the way down to f/32, and to shoot from farther away than I would like. Would using an extension tube(s) have a similar effect as say, shooting further from the subject? Shooting at f/32 will get the job done as far as getting the entire ring in focus, but overall the images is soft and every little piece of dirt on my sensor comes into focus.


50D / 28-1.8 / 100-2.8L / 200-2.8L / YN565Ex

  
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PUREBRAD
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Mar 05, 2012 19:08 as a reply to  @ PUREBRAD's post |  #13

Even at f/13, you can see how the rear shank is completely blown out.


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bps
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Mar 05, 2012 19:48 |  #14

Seeing this thread makes me want to buy some extension tubes!

Bryan


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red ­ snapper
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Mar 05, 2012 21:03 |  #15

Etherealdc wrote in post #14028273 (external link)
Those are some excellent photos! Thanks for sharing! Does anyone besides matt have anything to say about the cheap-o extension sets? I'm also looking at these Zeikos (external link); I mean, between these and the Kenko, am I paying for build quality? Fit? The reviews on Amazon are so schizophrenic that I can't make heads or tails of them.

Just had these delivered last week. Plastic mounts have already showed a few cracks, fixed with a bit of glue. Spend the extra and get metal mounts. Other than that they are great, full electronic connection and a lot of fun.

IMAGE: http://farm8.staticflickr.com/7040/6794554750_84511d95c6_m.jpg
Day 59 - 28_02_2012 Lens Cap (external link) by red snapper 205 (external link), on Flickr

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flickr (external link), 500px (external link)

  
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Extension tube+100mm Macro?
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