Canon EF 50mm f/1.8 II + Kenko Tubes

yb98 · 18th of March 2006 (Sat)

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

rudgej · 18th of March 2006 (Sat)

This is a very useful series of shots Yacine, and is great for giving people an idea of what is possible.

gugu · 18th of March 2006 (Sat)

Very usefull post!
Thanks.

Are you sure that the focus distance for the 50mm f/1.8 is 36cm?
Mine says 45cm.

RichardtheSane · 18th of March 2006 (Sat)

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.

yb98 · 18th of March 2006 (Sat)

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

yb98 · 18th of March 2006 (Sat)

Well I checked again and I confirm, it's 36 cm.

gugu · 18th of March 2006 (Sat)

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.

yb98 · 18th of March 2006 (Sat)

I measure from the front of the lens.

Jayson_Ang · 18th of March 2006 (Sat)

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

Jon · 18th of March 2006 (Sat)

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.

Bob_A · 18th of March 2006 (Sat)

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).

Lotto · 18th of March 2006 (Sat)

Very impressive. Thanks for sharing.

Jon · 18th of March 2006 (Sat)

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.

Mike Bell · 18th of March 2006 (Sat)

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!

ejwebb · 18th of March 2006 (Sat)

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

ej

18th of March 2006 (Sat)	#1
yb98 Goldmember Join Date: Feb 2003 Location: Paris Posts: 2,388 IMAGE EDITING OK	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 __________________ New Version DPP++ 11.1 Released DPP++ Video Channel Best DPP Threads Last edited by yb98 : 15th of August 2011 (Mon) at 21:03.

18th of March 2006 (Sat)	#2
rudgej Couch-potato photographer Join Date: Jul 2005 Posts: 5,613 IMAGE EDITING OK	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. __________________

18th of March 2006 (Sat)	#3
gugu Member Join Date: Jan 2006 Posts: 162 IMAGE EDITING OK	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. __________________ Canon 350D + OPTEKA BGRXT grip Canon EF-S 18-55mm f/3.5-5.6 Kit Lens Canon EF 28-135mm f/3.5-5.6 IS USM Canon EF 70-300mm f/4-5.6 IS USM Canon EF 50mm f/1.8 MK II Canon 580EX Lowepro Orion Trekker II

18th of March 2006 (Sat)	#6
yb98 Goldmember Join Date: Feb 2003 Location: Paris Posts: 2,388 IMAGE EDITING OK	Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics) Well I checked again and I confirm, it's 36 cm. __________________ New Version DPP++ 11.1 Released DPP++ Video Channel Best DPP Threads

18th of March 2006 (Sat)	#7
gugu Member Join Date: Jan 2006 Posts: 162 IMAGE EDITING OK	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. __________________ Canon 350D + OPTEKA BGRXT grip Canon EF-S 18-55mm f/3.5-5.6 Kit Lens Canon EF 28-135mm f/3.5-5.6 IS USM Canon EF 70-300mm f/4-5.6 IS USM Canon EF 50mm f/1.8 MK II Canon 580EX Lowepro Orion Trekker II

18th of March 2006 (Sat)	#9
Jayson_Ang Member Join Date: Dec 2005 Posts: 192	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 __________________ Canon EOS 350D :: EF-S 18-55mm :: EF 75-300mm

18th of March 2006 (Sat)	#12
Lotto Goldmember Join Date: Mar 2005 Location: Southern California Posts: 2,425 IMAGE EDITING OK	Re: Kenko Tubes + 50 mm 1.8 Tests (8 pics) Very impressive. Thanks for sharing. __________________ 5D, 24-70L, 70-200L IS, 50 f1.4, 100 Macro, 580 & 430EX

18th of March 2006 (Sat)	#15
ejwebb Senior Member Join Date: Sep 2003 Location: Kentucky Posts: 1,238	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? ej __________________ Current gear: Canon 20D, 70-300 IS, 85 1.8, 550EX; Tamron 17-50; Vivitar 283's; Bogen tripod w/ ballhead; Kenko tubes. Olympus PEN E-PL2, 14-42, VF-2; Panasonic 20 on the way!

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