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Old 18th of March 2006 (Sat)   #1
yb98
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Default Canon EF 50mm f/1.8 II + Kenko Tubes

I received yesterday the kenko tubes and made today some tests with the 50 mm 1.8 to have an idea about the magnification factor and the minimal focus distance that these tubes can gives. Here are the results.

50mm Alone
Minimal Focus Distance : 36 cm


50mm with 12 mm Tube
Minimal Focus Distance : 14 cm


50mm with 20 mm Tube
Minimal Focus Distance : 10,5 cm


50mm with 12+20 mm Tubes
Minimal Focus Distance : 7.5 cm


50mm with 36 mm Tube
Minimal Focus Distance : 7 cm


50mm with 12+36 mm Tubes
Minimal Focus Distance : 5.5 cm


50mm with 20+36 mm Tubes
Minimal Focus Distance : 5 cm


50mm with 12+20+36 mm Tubes
Minimal Focus Distance : 4 cm

Last edited by yb98 : 15th of August 2011 (Mon) at 21:03.
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Old 18th of March 2006 (Sat)   #2
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

This is a very useful series of shots Yacine, and is great for giving people an idea of what is possible.
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Old 18th of March 2006 (Sat)   #3
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Very usefull post!
Thanks.

Are you sure that the focus distance for the 50mm f/1.8 is 36cm?
Mine says 45cm.
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Old 18th of March 2006 (Sat)   #4
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Quote:
Originally Posted by gugu
Very usefull post!
Thanks.

Are you sure that the focus distance for the 50mm f/1.8 is 36cm?
Mine says 45cm.
Maybe this is referring to the MK1 version.
On my Mk1 45cm is the first mark, but the focus mechanism allows focussing slightly closer than that.
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Old 18th of March 2006 (Sat)   #5
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Quote:
Originally Posted by gugu
Very usefull post!
Thanks.

Are you sure that the focus distance for the 50mm f/1.8 is 36cm?
Mine says 45cm.
I have a doubt now... may be It was 46 instead of 36 then, I will check again
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Old 18th of March 2006 (Sat)   #6
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Well I checked again and I confirm, it's 36 cm.
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Old 18th of March 2006 (Sat)   #7
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Did you measure?
If you did, where did you measure from?
The front element of the lens?
Maybe 45cm that is writen on the lens is the distance from the sensor.
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Old 18th of March 2006 (Sat)   #8
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

I measure from the front of the lens.
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Old 18th of March 2006 (Sat)   #9
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

very useful post ...
geez ... i'm gonna think twice whether should i get an extension tube for insect shots ...
the distance's too close, will scare the insect away
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Old 18th of March 2006 (Sat)   #10
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Quote:
Originally Posted by yb98
I measure from the front of the lens.
Distance on the scale usually measures from the film plane. So 36 cm from the front of the lens would be about right.
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Old 18th of March 2006 (Sat)   #11
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Quote:
Originally Posted by Jon
Distance on the scale usually measures from the film plane. So 36 cm from the front of the lens would be about right.
And for anyone reading this thread, the "film plane" is indicated on the camera body by the marking just to the left of the viewfinder and to the right of the mode dial (looks like the greek letter phi).
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Old 18th of March 2006 (Sat)   #12
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Very impressive. Thanks for sharing.
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Old 18th of March 2006 (Sat)   #13
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Quote:
Originally Posted by Bob_A
And for anyone reading this thread, the "film plane" is indicated on the camera body by the marking just to the left of the viewfinder and to the right of the mode dial (looks like the greek letter phi).
As discussed at length, and with varying degrees of seriousness, here.
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Old 18th of March 2006 (Sat)   #14
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Quote:
Originally Posted by Jayson_Ang
very useful post ...
geez ... i'm gonna think twice whether should i get an extension tube for insect shots ...
the distance's too close, will scare the insect away
That's where long focal length Macro lenses come into their own. You can get better magnification with a Sigma 150mm macro at a distance of 20cm than Yb98 got at 5cm. Costs much more than a few tubes of course!
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Old 18th of March 2006 (Sat)   #15
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Default Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics)

Thanks for the post - very interesting! You don't have a 70-200 you can do this with do you?

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