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Canon EF 50mm f/1.8 II + Kenko Tubes

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Thread started 18 Mar 2006 (Saturday) 03:20   
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yb98
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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

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50mm with 12 mm Tube
Minimal Focus Distance : 14 cm
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50mm with 20 mm Tube
Minimal Focus Distance : 10,5 cm
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50mm with 12+20 mm Tubes
Minimal Focus Distance : 7.5 cm
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50mm with 36 mm Tube
Minimal Focus Distance : 7 cm
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50mm with 12+36 mm Tubes
Minimal Focus Distance : 5.5 cm
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50mm with 20+36 mm Tubes
Minimal Focus Distance : 5 cm
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50mm with 12+20+36 mm Tubes
Minimal Focus Distance : 4 cm
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Post #1, Mar 18, 2006 03:20:32


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

Post #2, Mar 18, 2006 03:23:07



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gugu
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Very usefull post!
Thanks.

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

Post #3, Mar 18, 2006 03:43:29


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Canon EF 50mm f/1.8 MK II
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RichardtheSane
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gugu wrote:
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.

Post #4, Mar 18, 2006 03:45:13 as a reply to gugu's post 1 minute earlier.


If in doubt, I shut up...

Gear: 40D, 12-24mm AT-X Pro, 17-85mm, Sigma 150mm Macro Sigma 100-300 F4, 550EX, other stuff that probably helps me on my way.

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yb98
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gugu wrote:
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

Post #5, Mar 18, 2006 04:10:14 as a reply to gugu's post 26 minutes earlier.


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yb98
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Well I checked again and I confirm, it's 36 cm.

Post #6, Mar 18, 2006 04:14:23 as a reply to yb98's post 4 minutes earlier.


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gugu
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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.

Post #7, Mar 18, 2006 04:24:30


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yb98
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I measure from the front of the lens.

Post #8, Mar 18, 2006 04:25:33 as a reply to gugu's post 1 minute earlier.


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Jayson_Ang
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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

Post #9, Mar 18, 2006 10:48:29


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Jon
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yb98 wrote:
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.

Post #10, Mar 18, 2006 15:32:47 as a reply to yb98's post 11 hours earlier.


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Bob_A
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Jon wrote:
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).

Post #11, Mar 18, 2006 15:50:39 as a reply to Jon's post 17 minutes earlier.


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Lotto
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Very impressive. Thanks for sharing.

Post #12, Mar 18, 2006 16:15:52


5D, 24-70L, 70-200L IS, 50 f1.4, 100 Macro, 580 & 430EX

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Jon
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Bob_A wrote:
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.

Post #13, Mar 18, 2006 16:16:11 as a reply to Bob_A's post 25 minutes earlier.


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Mike ­ Bell
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Jayson_Ang wrote:
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!

Post #14, Mar 18, 2006 16:30:45 as a reply to Jayson_Ang's post 5 hours earlier.


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

ej

Post #15, Mar 18, 2006 16:35:09


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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