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Now for the shot of the Takumar set up on the tubes.
Starting at the top, there is an (out of focus) diaphragm activation pin for the Takumar. This has to be manually activated to stop down the diaphragm to f11, or whatever you have chosen. If you set the lens manually to f11, you won't be able to see anything through the viewfinder, so you won't be able to focus. So, set the lens to Auto, and the diaphragm will be open at f1.8, (or 1.4, or 2.0, or whatever), and there will be adequate light to focus. Then, just before you trip the shutter, press the pin in, and the lens will stop down to whatever you have set. You will need at least one additional arm, preferably with at least 2 double length fingers to accomplish this, but it is possible, even hand held, as I have shown, but you can expect more OOF shots than usual. It's easier on a tripod, but using a tripod for insects etc is a real pain, though it's OK for stainless steel rulers, stamps, coins etc.
Next down is the reversed Takumar, which speaks for itself.
Below that is a filter without the glass. What the hell is that for you may well ask? The answer is that as I couldn't get the optional double length fingers, I had to position the lens diaphragm pin as close to my ordinary finger as possible, so that I could reach it. So I use the glassless filter as a spacer ring, and screwed the Tak onto it until the pin was in the correct location for my finger, and put a drop of Loctite in to ensure it located correctly every time.
Next the filter screws into the reversing ring, which in this case is in 2 parts. The reversing ring itself is a male 49mm ring that fits into the front of the Takumar lens (or in this case the glassless filter spacer), and the other end is a female 58mm ring into which screws the EOS adaptor, which has a male 58mm ring on the front. This is so I can use my Canon lenses in reverse should I wish to do so, most of them being 58mm filters.
Then there are the extension tubes, but you have seen them (or the Pentax ones) on eBay. BTW, those seem to be excellent value for money, providing they fit your camera, you can't possibly go wrong for less than $20 or so, can you?
My ext tubes are automatic, but of course they are only auto when coupled with a Canon auto lens, so if I use them with any of the other options, I have to do everything manually.
This has been very long winded, but it does explain everything, I hope. If you have any further questions, just ask.
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