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Canon EF 12mm and 25mm Extension Tubes

Canon EF 12mm and 25mm Extension Tubes

 

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Canon Extension Tubes

Canon EF 12mm and 25mm Extension Tubes

 

Canon EF 12mm and 25mm Extension Tubes

Sample Images

A selection of photos taken with the Canon EF 12mm and 25mm Extension Tubes.

Clicking on the thumbnail images will open a larger image in a pop-up window.

Canon EF 100mm f/2.8L IS Macro lens with 25mm extension tube - Click for larger image
Camera: 40D
Lens: Canon EF 100mm f/2.8L IS Macro
ISO: 100
Aperture: f/8.0
Shutter speed: 1/125
Focal length: 100mm
EC +/-: 0
Monopod/Tripod: Gitzo GT2541EX
Flash: Canon 550EX + ST-E2
Extender: 25mm extension tube
Location: Thailand
File Size: 216 KB
Canon EF 100mm f/2.8L IS Macro lens with 25mm extension tube - Click for larger image
Camera: 40D
Lens: Canon EF 100mm f/2.8L IS Macro
ISO: 100
Aperture: f/8.0
Shutter speed: 1/125
Focal length: 100mm
EC +/-: 0
Monopod/Tripod: Gitzo GT2541EX
Flash: Canon 550EX + ST-E2
Extender: 25mm extension tube
Location: Thailand
File Size: 213 KB
Thai stamp 100% crop - Click for larger image
Camera: 40D
Lens: Canon EF 85mm f/1.8
ISO: 200
Aperture: f/6.3
Shutter speed: 1/200
Focal length: 85mm
EC +/-: 0
Monopod/Tripod: Gitzo GT2541EX
Flash: Canon 550EX + ST-E2
Extender: 25mm extension tube
Location: Thailand
File Size: 248 KB
Thai stamp 100% crop - Click for larger image
Camera: 40D
Lens: Canon EF 85mm f/1.8
ISO: 200
Aperture: f/6.3
Shutter speed: 1/200
Focal length: 85mm
EC +/-: 0
Monopod/Tripod: Gitzo GT2541EX
Flash: Canon 550EX + ST-E2
Extender: 25mm extension tube
Location: Thailand
File Size: 317 KB
Thai spider - Click for larger image
Camera: 40D
Lens: Canon EF 100mm f/2.8L IS Macro
ISO: 100
Aperture: f/8.0
Shutter speed: 1/160
Focal length: 100mm
EC +/-: 0
Monopod/Tripod: Gitzo GT2541EX
Flash: Canon 550EX + ST-E2
Extender: 25mm extension tube
Location: Thailand
File Size: 155 KB
Thai spider - Click for larger image
Camera: 40D
Lens: Canon EF 100mm f/2.8L IS Macro
ISO: 100
Aperture: f/8.0
Shutter speed: 1/100
Focal length: 100mm
EC +/-: 0
Monopod/Tripod: Gitzo GT2541EX
Flash: Canon 550EX + ST-E2
Extender: 25mm extension tube
Location: Thailand
File Size: 172 KB

No link available on Amazon UK for Canon 25mm extension tube

No link available on Amazon US for Canon 12mm extension tube

 

Chiang Rai rice fields and mountains

 

 

Thailand, my adopted home, is a great vacation destination for many activities, particularly photography. It's easy to get around and hotels are cheap. Using Agoda to book a hotel on-line will give you a great selection of hotels and the best deals. I always use Agoda to book my own hotels.

 

Extension Tubes

Extension tubes contain no optical elements. They are simply hollow tubes that allow lenses to be mounted further away from the focal plane of a camera while preserving all the electrical contacts so that the lens functions as if it were attached directly to the camera body.

Thus, they are very different to extenders/teleconverters that do contain optical elements.

What's the point? All lenses have a minimum focusing distance. The addition of an extension tube in between the body and lens reduces the minimum focusing distance. The lens can therefore get nearer to the subject, and the result is a magnifying effect. Using an extension tube is a cheap way of turning a regular lens into a macro lens.

Of course, nothing comes free. The addition of an extension tube also decreases the maximum focusing distance. Most lenses can focus to infinity but with an extension tube they can't, so they lose normal functionality. There is also a loss of light, and vignetting can occur.

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Kenko Tubes

Extension tubes have no optical qualities, just electrical contacts. There is no reason why products from different manufacturers shouldn't be exactly the same.

If I had seen a set of Kenko tubes, I would probably have bought them. There are three tubes in the Kenko set (12mm, 20mm, 36mm) and they are cheaper than Canon. All I could find were original Canon items so that is what I bought.

I read one report about lenses attached to Kenko tubes falling off, but I guess that isn't normal.

The original Canon tubes didn't support EF-S. The only difference with the version II tubes is that they support Canon EF-S Lenses. In addition to the red EF mount dot, there is also a white EF-S dot.

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Magnification and Compatibility

How much additional magnification will an extension tube give you?

While Googling this I came across some quite complex formulae. The formula I like (because I can understand it) is:

Additional Magnification = (Extension Tube Length) ÷ (Lens Focal Length)

When using a 25mm extension tube with my Canon EF 100mm f/2.8L IS Macro lens, the extra magnification would be:

25mm ÷ 100mm = 0.25 (or about ¼ more magnification)

What about compatibility?

Extension tubes reduce the minimum (and maximum) focusing distance of a lens. With short lenses that have a fairly short minimum focusing distance in the first place, the addition of an extension tube can actually bring the minimum focusing distance to behind the front element - thus making it impossible to focus.

I haven't tried it myself, but from what I've read it is not advisable to use extension tubes with lenses shorter than about 50mm.

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Canon Specifications

I've only included the lenses that I use. Information for the 100mm f/2.8L IS Macro lens wasn't available because it was only announced fairly recently. Extension tubes can't be used with the EF-S 10-22mm Ultra Wide Angle lens.

  • EF85mm f/1.8 USM + EF12mm II Extension Tube

    Magnification

    0.27x - 0.15x

    Focusing Distance Ranges

    498mm - 723mm

    Working Distance

    345mm - 595mm

  • EF300mm f/4L IS USM + EF12mm II Extension Tube

    Magnification

    0.30x - 0.04x

    Focusing Distance Ranges

    1338mm - 7795mm

    Working Distance

    1061mm - 7518mm

  • EF400mm f/5.6L IS USM + EF12mm II Extension Tube

    Magnification

    0.16x - 0.03x

    Focusing Distance Ranges

    2893mm - 13449mm

    Working Distance

    2580mm - 13136mm

  • EF17-40mm f/4L USM + EF12mm II Extension Tube

    Magnification

    Focusing Distance Ranges

    Working Distance

    WIDE

    0.83x - 0.70x

    TELE

    0.59x - 0.32x

    WIDE

    155mm - 159mm

    TELE

    206mm - 271mm

    WIDE

    2mm - 5mm

    TELE

    53mm - 118mm

  • EF70-200mm f/4L IS USM + EF12mm II Extension Tube

    Magnification

    Focusing Distance Ranges

    Working Distance

    WIDE

    0.23x - 0.17x

    TELE

    0.28x - 0.06x

    WIDE

    554mm - 627mm

    TELE

    1008mm - 3467mm

    WIDE

    318mm - 401mm

    TELE

    782mm - 3840mm

  • EF85mm f/1.8 USM + EF25mm II Extension Tube

    Magnification

    0.44x - 0.32x

    Focusing Distance Ranges

    386mm - 428mm

    Working Distance

    218mm - 285mm

  • EF300mm f/4L IS USM + EF25mm II Extension Tube

    Magnification

    0.37x - 0.09x

    Focusing Distance Ranges

    1216mm - 3946mm

    Working Distance

    924mm - 3654mm

  • EF400mm f/5.6L IS USM + EF25mm II Extension Tube

    Magnification

    0.21x - 0.07x

    Focusing Distance Ranges

    2460mm - 6610mm

    Working Distance

    2132mm - 6282mm

  • EF17-40mm f/4L USM + EF25mm II Extension Tube

    Magnification

    Focusing Distance Ranges

    Working Distance

    WIDE

    Not available

    TELE

    1.02x - 0.70x

    WIDE

    -

    TELE

    196mm - 218mm

    WIDE

    -

    TELE

    28mm - 50mm

  • EF70-200mm f/4L IS USM + EF25mm II Extension Tube

    Magnification

    Focusing Distance Ranges

    Working Distance

    WIDE

    0.42x - 0.38x

    TELE

    0.37x - 0.14x

    WIDE

    407mm - 410mm

    TELE

    879mm - 1790mm

    WIDE

    166mm - 169mm

    TELE

    638mm - 1549mm

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Set Up and Focusing

Close-up shots, as with long telephoto shots, are subjected to vibration. I used a tripod, mirror lockup, and the two second timer so that I didn't move the camera while operating the shutter.

I focused the lens manually using live view with the 10x magnification option. Autofocus seems to work pretty accurately but Canon advise manually focusing for macro shots.

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Post-Processing

Most original images were shot in the RAW format and converted with Adobe Camera Raw. Noise was reduced using Imagenomic Noiseware Professional. Small amounts of image enhancement were applied using Adobe Photoshop CS2 (curves, levels, saturation) before sharpening using the Smart Sharpen filter (Amount: 30% - 120%, Radius: 0.2px - 0.3px, Remove: Lens Blur).

JPG images were saved with a 'High' quality setting of '8' on a scale of 0-12.

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Details

Weight: EF 12mm - 2.3oz/66g; EF 25mm - 3.4oz/95g
Soft pouch: Included
Date Purchased: March 2010
Supplier: Parisilk, Singapore
Price: EF 12mm - SGD$75; EF 25mm - SGD$154

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Visit Thailand

Thailand is an incredibly photogenic country, both for its landscapes and its people. Regardless of whether you enjoy large Asian cities, beaches and islands, or rice fields and mountains, Thailand has something for you and it is a dream destination for photographers.

One of the great things about visiting Thailand is that hotels are plentiful and a lot cheaper than in most other countries. I always use Agoda to book hotels in Thailand. The company was established in Thailand and has great local knowledge, as well as a huge inventory of hotels.

If you click on one of the destinations opposite you will get a list of hotel deals from Agoda. It's generally a good idea to book on-line because you will get a good room rate and you won't suffer the disappointment of arriving at a hotel to find that it is full.

I book hotels regularly in Thailand and I have always found Agoda to be the best on-line travel agent. At times I have spent a lot of time researching hotel prices and although other deals sometimes look better at first I always end up returning to Agoda.

If you don't wish to pay for your hotel at the time of booking, Booking.com normally allows you to pay when you check in at the hotel. Some people prefer this method, but I have always found Booking.com to be more expensive than Agoda.

If you want to compare prices between different on-line travel agents (OTAs) for a specific hotel, you can use a company such as HotelsCombined. However, you will normally find that Agoda is the cheapest and therefore you can save yourself time and money by just booking through Agoda in the first place.

Images of Thailand

Images of Thailand

 

 

Cities

Beaches

Mountains & Hilltribes

Islands

Interesting

 

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