July 22, 2014, 01:30:47 PM

Author Topic: Advice: extension tubes Macro  (Read 6871 times)

2n10

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Re: Advice: extension tubes Macro
« Reply #15 on: August 12, 2013, 04:45:35 PM »
I don't have an opinion on what you should get,  but I'm curious,  why do you need/ wan't to get so close?

I guess the ext tubes make in general more sense on those lenses where mfd is less close than my macro lens
I just find the mfd of 1ft (0.3m) not close enough for archeologic artifacts


I'm a bit confused by the mfd for this lens with the extension tubes.

From the manual, mfd with no extension tubes is 300mm (magnification 1.00).

With a 12mm tube, it's 302mm (magnification 1.17).
With a 25mm tube, it's 307mm (magnification 1.37).

So they don't reduce the mfd at all, just increase the magnification.  Is this the normal way macro lenses work?  It's been too long since I used extension tubes on mine.


The minimal working distance will slowly decrease, but after around 1:1 magnification, the minimal focus distance will increase again due to the increased distance of the extension tubes. Think about the single thin lens formula (see e.g., http://photonius.wikispaces.com/Close-up+%26+Macro), as the object gets closer and closer to the camera (lens), the lens moves further and further from the sensor (i.e. projected image). At 1:1 a 50mm lens is 100mm from the sensor and 100mm from the object. Increasing magnification further, the situation now simply reverses, i.e. the lens moves further and further away from the senor, while the object creeps closer to the lens. Once the object is 50mm from the lens (the focal length), the image (sensor) has to be at infinity from the lens.


 do we ever get to divide by pi?


ROFLMAO.
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Re: Advice: extension tubes Macro
« Reply #15 on: August 12, 2013, 04:45:35 PM »

danski0224

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Re: Advice: extension tubes Macro
« Reply #16 on: August 12, 2013, 05:11:55 PM »
Just a reminder that the Canon teleconverters will not work with the macro lenses.

The 100mm macro may not work with a Canon teleconverter, but the 180mm macro does.
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drjlo

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Re: Advice: extension tubes Macro
« Reply #17 on: August 12, 2013, 05:42:51 PM »
"Vivitar" (same as "Pro Optic") extension tube set (13, 21, and 31 mm set) is built like a tank and has worked perfectly,all for $62.90.  No need to pay premium for Canon air IME.

http://www.adorama.com/VVEXTC.html

AudioGlenn

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Re: Advice: extension tubes Macro
« Reply #18 on: August 12, 2013, 06:04:12 PM »
I use the Kenko tubes.  (~$150 from eBay I believe).  They work great.
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Re: Advice: extension tubes Macro
« Reply #19 on: August 12, 2013, 09:37:10 PM »
"Vivitar" (same as "Pro Optic") extension tube set (13, 21, and 31 mm set) is built like a tank and has worked perfectly,all for $62.90.  No need to pay premium for Canon air IME.

http://www.adorama.com/VVEXTC.html

Same cheap plastic ones as I have.  They work fine for occasional use, but for someone using them as part of his job like the OP is, I'd go for metal.  They do have a weakness, the mounts spring open with a larger lens on them, and that makes the top and bottom go out of focus, since the lens basically tilts.

rpt

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Re: Advice: extension tubes Macro
« Reply #20 on: August 12, 2013, 09:52:35 PM »
Just a reminder that the Canon teleconverters will not work with the macro lenses.

The 100mm macro may not work with a Canon teleconverter, but the 180mm macro does.
If you add a 12mm macro extension tube it will work.

monkeyhand

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Re: Advice: extension tubes Macro
« Reply #21 on: August 15, 2013, 09:45:47 PM »
I bought an old pair of used Canon ones for pretty cheap.  If you go with the older set they only work with EF lenses and not EF-S lenses but I saved about 70 bucks.
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Re: Advice: extension tubes Macro
« Reply #21 on: August 15, 2013, 09:45:47 PM »

danski0224

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Re: Advice: extension tubes Macro
« Reply #22 on: September 01, 2013, 06:23:05 PM »
If you add a 12mm macro extension tube it will work.

I tried a Kenko 12mm tube and a Canon 1.4xIII converter on a 5DIII.

The AF seems to work if the focus point is more than about 18" away.

If I attempt AF within the yellow Macro range indicated on the lens, the AF is jittery and won't lock on. Manual AF works as well as my eyes do :)

Is this typical for extension tube use?

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makuroske

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Re: Advice: extension tubes Macro
« Reply #23 on: September 01, 2013, 08:49:04 PM »
I purchased the kenko extension tube set last year and have been really happy with them despite:

more ISO noise
more light required to get proper exposure
more sensor dust
losing infinity focus

You might also want to look into a macro focusing slider.

Here are a few pics i took with the kenko tubes and the 5D II + canon 100mm 2.8 USM macro lens.

1. Japanese Hawk Moth Caterpillar (スズメガ)
2. Japanese Giant Killer Hornet (オオスズメバチ)

rpt

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Re: Advice: extension tubes Macro
« Reply #24 on: September 02, 2013, 01:22:36 AM »
I purchased the kenko extension tube set last year and have been really happy with them despite:

more ISO noise
ETTR or manual exposure.

Quote
more light required to get proper exposure
Yup! Light 101 - the intensity of light is inversely proportional to the square of the distance... So expect that to happen.

Quote
more sensor dust
Don't know about that...

Quote
losing infinity focus
Yup! So only works for macro work...

Quote
You might also want to look into a macro focusing slider.
+10000! You may want one that moves along two axis. If you ask neuro he'd say get the RRS one...

Quote
Here are a few pics i took with the kenko tubes and the 5D II + canon 100mm 2.8 USM macro lens.

1. Japanese Hawk Moth Caterpillar (スズメガ)
2. Japanese Giant Killer Hornet (オオスズメバチ)
Lovely!

Eldar

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Re: Advice: extension tubes Macro
« Reply #25 on: September 02, 2013, 06:13:35 AM »
I got the Canon versions for the same reason as Neuro, for use with my 600mm, but from what I hear and read, the Kenko will work just as well. Giving the short DOF, I strongly recommend a macro focusing slider and the best I have found is the Really Right Stuff. It is very high quality, very smooth. For really close ups I use the Novoflex bellow. But then your mobility become quite snailish.
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danski0224

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Re: Advice: extension tubes Macro
« Reply #26 on: September 02, 2013, 08:03:49 AM »
I got the Canon versions for the same reason as Neuro, for use with my 600mm, but from what I hear and read, the Kenko will work just as well. Giving the short DOF, I strongly recommend a macro focusing slider and the best I have found is the Really Right Stuff. It is very high quality, very smooth. For really close ups I use the Novoflex bellow. But then your mobility become quite snailish.

Any thoughts on the Novoflex slider?
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Camerajah

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Re: Advice: extension tubes Macro
« Reply #27 on: September 02, 2013, 09:13:19 AM »
One should get a set of close up lens as well extension tube,close up lens normally come in sets of 3
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Re: Advice: extension tubes Macro
« Reply #27 on: September 02, 2013, 09:13:19 AM »

Eldar

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Re: Advice: extension tubes Macro
« Reply #28 on: September 03, 2013, 04:06:09 AM »
I got the Canon versions for the same reason as Neuro, for use with my 600mm, but from what I hear and read, the Kenko will work just as well. Giving the short DOF, I strongly recommend a macro focusing slider and the best I have found is the Really Right Stuff. It is very high quality, very smooth. For really close ups I use the Novoflex bellow. But then your mobility become quite snailish.

Any thoughts on the Novoflex slider?

Novoflex in general delivers very high quality products. I have not used their slider, but I am sure it´s a very good alternative. It also has some expansion options which could be of interest if this is your main area of photography. To me macro is a fun add-on in the absence of birds and wildlife.

I have been very happy with the RRS heads I have for my tripods and monopod and the solid and simplistic design of their slider appealed to me. The micro focus control you get with the lead screw (1.25mm pr. 360 degree turn) works very well. It is also $200 cheaper than the Novoflex.
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alexturton

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Re: Advice: extension tubes Macro
« Reply #29 on: September 03, 2013, 08:02:38 AM »
get the kenko tubes. They are relative cheap and give a wide range of extension stacking options
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Re: Advice: extension tubes Macro
« Reply #29 on: September 03, 2013, 08:02:38 AM »