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Question: I am interested in dew drop refraction - would I attach this to the mount and then attach my  DFA macro lens to the extention?
Document: I use it with my old manual pentax 50mm lens on my canon xs with a generic k to eos mount. Works great. Remember, no electronic aperture control, no auto focus with this. You can't expect it for the price. As long as you know what you're doing and read up on macro photography from the many internet sources and you should get great macro images. You will need some kind of "live view" for focus. If your camera doesn't have that feature you may have problem with focusing.
So overall this is a cheap set of extension tubes and as such the work like expected.They are constructed a little impractically, though. There are two k-mount pieces - one for your lens and one for the camera. The two pieces can then be connected to each other directly or with extension pieces in between.
At the silver locking tab, and at various points (not many, but enough) along where you attach the lens light bleeds in. I attached a lens with cap on, made sure all connections were tight, put the open end to my eye and ran a led light all along the outside to see where light was getting in.
I have a bunch of these older lenses. But they are stored in a different state and not with me, which is irritating...This is a good cheap way to turn a regular lens into a macro lens if you can manually set the lens aperture.
It may be totally manual focus and aperture, but results are great. The vibration reduction built into the Pentax works well also, I set it for about twice the actual focal length of the lens when working with macro. Had good results with and without a tripod.
The awkward position is similar regardless of which or how many extensions are used. I could, of course, have a bad copy.Since I'll devote a specific lens to this assembly, I can modify the device to fit and seal, but this might not be the best starting point for someone taking their first venture into macro photography with the all manual lenses required.The resulting images are fine, and true macro capability is achieveable.
You basically focus on your subject by moving the camera a little bit, rather than turning the focus ring.It's all good fun and a cheap way to get into macro photography.One last thing, your lenses cannot connect electronically or mechanically with your camera with extension tubes attached. That means that both focusing and f-stops have to be selected manually. If your lens doesn't have a ring for manually selecting f-stop, I suspect that it can only shoot with a fully open aperture.
I have bought an extension tube set for a Canon previously (other seller) and that one fit extremely sloppy, I mean the lens rattled 1/8 inch. Not the case here at all, just the right degree of snugness both on the camera and on the lens side flanges. No optical distortion as could happen with single element macro add on filter (though now Phoenix makes inexpensive multi elemnt 10x adapter), but there is a light loss proportional to how long of an extension you use.
Simple concept, cheap price. The manufacturer's own genuine product is frightfully expensive. I understand why you are lured to this made-in-China toy. But there are problems. For starters, the screw and mount are machined with poor precision. The tubes don't screw into each other as smoothly as they should. The mount doesn't lock on to the camera body as smoothly as it should. In fact I suspect it's rubbing against parts of my camera body that it shouldn't.
I have a Pentax K20D and this set of extension tubes from Fotodiox work great. The price was good and quality seems fine. I only wish they would make a set of tubes for Pentax cameras that keeps your auto functions on your camera working.
Answer: These go "between" the body and the lens.They don't have the electronic contacts, so if you have no aperture ring, you wouldn't be able to control the aperture or stop-down.I think you have to stop-down a lot for those reflections in dewdrops, if that's what you mean. You're probably better off if you used the autofocus type extension tubes like the Kenko, Meike, etc.These tubes work best with the older film slr lenses with manual focus and aperture rings.