Kenko Tubes

I received my kenko tubes today and I cannot seem to get them to work with any EF lens. I have no idea if I am doing something wrong or I got defective tubes. Any suggestions in case of user error? Thanks!

Which Kenko tubes did you get? What do you mean by "cannot seem to get them to work"? Do they mount on camera? Do the lenses mount on the tubes? Is it just that you can't focus on something? Is autofocus not working?

troypiggo wrote in post #6242604
Which Kenko tubes did you get? What do you mean by "cannot seem to get them to work"? Do they mount on camera? Do the lenses mount on the tubes? Is it just that you can't focus on something? Is autofocus not working?

I can mount them just fine but the auto focus nor manual focus will work. I cannot make anything out in though them, it is just fuzzy.

I purchased the Kenko 3 ring set for Canon EOS.

i find that sometimes the camera needs to be turned off before the tubes & lens are attached, in order to electronically recognise the lens (for the aperture to work)

when you say everything is fuzzy... you might be too far away from the subject. tubes mean you need to get VERY close... almost touching with the longer tubes. and dont bother with AF... use MF or zoom ring to focus, or move the camera slightly unil the point of focus is correct thru the VF. if your camera has live view, this is where it comes in handy.

i basically only use my tubes with my 50mm f/1.8... zoom is basically useless at those tiny distances

you will prolly need to drop your aperture a little as well if you are used to shooting wide open, otherwise the focal plane will be far too thin

The behaviour of tubes will vary depending on the length and number of them you use, and also what lens you're using on them.

You realise that you lose infinity focus? Basically what they do is just put more distance between the lens and sensor/film, allowing the lens to focus closer than the bare lens. It is possible that if you're using too many tubes, the focal point is just millimetres in front of the lens.

Try just one of the short tubes with your lens and see how that goes.

Do the tubes have electrical contacts on them? Like the ones on your lenses? If so, you'd assume AF should work. I don't understand how MF "can't work", that's in your hands

Okay I feel stupid I was not close enough. Okay I am off to find a pile of sand to stick my head in. Thanks for helping the dummy!!

dont be silly - we all have to learn! glad it was such a simple fix, post some of your macro shots here to show us

No worries. The only stupid question is an unasked one.

Glad it's sorted.

No worries. The same thing happened to me the first time I used tubes. It took me a minute or two to figure out that I just wasn't close enough.

reneethomas wrote in post #6242674
Okay I feel stupid I was not close enough. Okay I am off to find a pile of sand to stick my head in. Thanks for helping the dummy!!

I still have my box of sand left over from when I had the same "issue", you can borrow my box.

Don't feel bad, I did the same thing when I first got mine.

Well this is my first attempt with the 36mm tube. Not the best shot but at least I can get something..lol

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Also, it's very important to make sure you fill the tubes with L grade air.

J.

JohnJ80 wrote in post #6250104
Also, it's very important to make sure you fill the tubes with L grade air.

J.

Now that is just plain funny!

L grade air is incompatible with kenko... severe malfunctions in air optics may occur