Extension Tubes for Fullframe E-mount cameras

Introduction

Kenko and Fotodiox Pro extension tubes emount e-mount macro makro zwischenring extension ring full frame fullframe fe
Kenko and Fotodiox Pro extension tubes

I do own a macro lens (Sigma 150mm 2.8) that I use for most of my product shots on this blog, but I rarely take it out for shooting as it is quite bulky and heavy. Nevertheless I like to take a close up shot from time to time so I decided to try out the Kenko and Fotodiox Pro extension tubes, to turn my Loxia 85mm 2.4 into a macro lens.

Sample Images

extension tube kenko fotodiox pro ring zwischenring loxia zeiss carl 85mm 2.4 10 16 26
Sony A7rII | Zeiss Loxia 85mm 2.4 | f/2.4 | 16mm Kenko Extension tube
extension tube kenko fotodiox pro ring zwischenring loxia zeiss carl 85mm 2.4 10 16 26
Sony A7rII | Zeiss Loxia 85mm 2.4 | f/4.0 | 10+16mm Kenko Extension tube
extension tube kenko fotodiox pro ring zwischenring loxia zeiss carl 85mm 2.4 10 16 26
Sony A7rII | Zeiss Loxia 85mm 2.4 | f/2.4 | 16mm Kenko Extension tube

Specifications

Kenko

    • Weight: 42+64 g
    • Length: 10+16 mm
    • Material: metal

Price: 120$/170€ on Amazon.com/Amazon.de (affiliate links)

Fotodiox Pro

    • Weight: 25+29 g
    • Length: 10+16 mm
    • Material: aluminium

Price: 45$/45€ on Amazon.com/Amazon.de (affiliate links)

Handling / Build Quality

The Kenko extension tubes feature some felt inside to increase resistance against internal reflections, the Fotodiox tubes are only painted black:


Before: Kenko / After: Fotodiox Pro

The Fotodiox tubes feel very light by comparison, but still rigid enough and actually they have a tigher fit than the Kenko tubes. If you use both Kenko tubes at the same time there is significant radial play in the whole package which did really annoy me. The Fotodiox tubes don’t share this issue.

The release buttons are also quite different, as can be seen in this picture:

Kenko and Fotodiox Pro extension tubes emount e-mount macro makro zwischenring extension ring full frame fullframe fe
Left: Kenko, Right: Fotodiox Pro

From the outer appearance I prefer the Kenko tubes. The paint job on the Fotodiox tubes is rather sloppy: the writings are not aligned to each other and some of the red paint got spilled as it seems.

How close can you get?

Extension tubes have a higher impact on lenses with shorter focal lengths but the minimum focus distance might be reduced so much on ultrawide lenses, that the lens will shade your subject.
I prepared this table to give you an impression what to expect:

  no tube10mm tube16mm tube10+16mm tubes
MFDmax. magnificationmax. magnificationmax. magnificationmax. magnification
Zeiss Loxia 21mm 2.825 cm1:7.81:1.71:1.1lens obstructs image
Voigtlander VM 35mm 1.750 cm1:10.51:2.51:1.81:1.2
Voigtlander VM 50mm 1.570 cm1:10.81:3.51:2.41:1.7
Zeiss Loxia 85mm 2.480 cm1:81:3.71:2.91:2.1
Voigtlander SL 180mm 4.0 APO-Lanthar120 cm1:41:3.31:2.91:2.5

Quality of the anti reflection measures

As already written above only the Kenko tubes feature some felt on the inside to counter reflections, but does it really make a difference? This depends on the lens in use and where point light sources are situated in the frame.

In this scene the differences are negligible:


Before: Kenko / After: Fotodiox Pro

But with the point light source just barely outside the frame the problems with the Fotodiox Pro tube start to appear:


Before: Kenko / After: Fotodiox Pro

This is the same shot without any extension tubes for your reference:

Kenko and Fotodiox Pro extension tubes emount e-mount macro makro zwischenring extension ring full frame fullframe fe
Sony A7s | Zeiss Loxia 85mm 2.4 | 2.4 | MFD

So the felt really can make a difference. To my knowledge the Kenko tubes are the only ones that feature it from factory.

Alternatives

There are many cheaper extension tubes available, but I already lost some of my money by trying to get to work cheap extension tubes with my Nikon DSLRs, so I leapfrogged that step in E-mount land.

As far as I know I tried the two most sophisticated (or expensive) E-mount extension tubes (Sidenote: from the moment I bought the Fotodiox tubes until now the price dropped by almost 50%!) and even they have some issues, for serious work I can only recommend not wasting any time and money with the cheaper tubes.

Conclusion

I am not really happy with either of the tubes I tested. Thing is, I actually need them, so I tried to pick the lesser of two evils. Glare and flare because of internal reflections really put me off and I am not exactly in the mood of trying to flock the tubes myself (if you are check out this article), so the Fotodiox tubes weren’t an option anymore after the comparison.
The radial play in the Kenko tubes is absoluetely ridiculous considering the high price tag and some lenses sit rather tight while others don’t.
I nevertheless picked the Kenko tubes for myself, as they offered better image quality in the end, but there is certainly room for improvement.

Sample Images

extension tube kenko fotodiox pro ring zwischenring loxia zeiss carl 85mm 2.4 10 16 26
Sony A7rII | Zeiss Loxia 85mm 2.4 | f/5.6 | 16mm Kenko Extension tube
extension tube kenko fotodiox pro ring zwischenring loxia zeiss carl 85mm 2.4 10 16 26
Sony A7rII | Zeiss Loxia 85mm 2.4 | f/2.4 | 16mm Kenko Extension tube
extension tube kenko fotodiox pro ring zwischenring loxia zeiss carl 85mm 2.4 10 16 26
Sony A7rII | Zeiss Loxia 85mm 2.4 | f/8.0 | 16mm Kenko Extension tube

Further Reading

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My name is Bastian and for many years I have been mostly shooting Nikon DSLRs. As of today I have made my transition from Nikon to Sony and I am mainly using small but capable manual lenses. My passion is landscape photography but I also like to delve into other subjects from time to time.

6 thoughts on “Extension Tubes for Fullframe E-mount cameras”

  1. In the US, Vello tubes seem to be the best seller. I haven’t compared them to anything else, but they seem to work OK.

  2. Have you experienced any loss of sharpness when using extension tubes with the 85mm Loxia? I am trying to scan 35mm film negatives with my Sony A7 so I need something that gives me 1:1 magnification. I have tried using my Zeiss Contax 28mm F2.8 in conjunction with cheap 10mm and 16mm extension tube which gives me around 1:1 magnification. However, even when stopped down to F11 only the very center is sharp. The outer 3/4 of the frame looks horrible. Would a Zeiss Contax 100mm F3.5 lens work better for my purpose if I added enough extension tubes to get close to 1:1 or should I just buy a 1:1 macro lens? Thank you!

    1. The 21mm and 85mm Loxia lenses have very sophisticated and modern state of the art lens designs and retain great optical quality even at the minimum focus distance (and beyond) despite not having floating elements. This suprised me quite a bit to be honest.
      For your purpose I would recommend getting a dedicated macro lens though, best in the range of 90/100mm, as they usually show least distortion.

  3. My thoughts are the same as yours. I needed E-mount tubes for native E-mount lenses, so I bought a Kenko set, based on internet opinions that they were the best choice. And I think that they are best when comparing the alternatives, but “best” in terms of build quality isn’t what comes to mind when using them.

    Mine also have an unacceptable amount of play, and the release button feels less than firmly attached. They are nowhere near the quality of my older OEM Canon tube set. I’ll make a point of using the latter if I’m attaching a Canon-mount lens to the A7RII via Metabones adapter. However, I do like the fact that the two sets contain different tube sizes; if I need a shorter tube than 12mm with a wide focal length Canon-mount lens, I can still use the 10mm Kenko tube on the opposite side of the Metabones adapter, for example.

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