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NEW REVERSING RING MACRO CLOSE UP for the MINOLTA SLR CAMERAS MADE IN JAPAN US $9.99

NEW REVERSING RING MACRO CLOSE UP for the NIKON SLR CAMERAS MADE IN JAPAN US $9.99

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Macro 52mm Reverse Mount Adapter Ring to Canon EOS Lens US $5.69

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Camera 72mm Metal Reverse Macro Lens Adapter Ring Black for Nikon US $10.35

55mm Macro Reverse Adapter Ring For Pentax K MOUNT PK US $3.97

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58mm Macro Reverse Adapter Ring Canon EF-s 18-55mm AV22 US $2.99

Male to Male 82mm- 82mm 82- 82mm 82 to 82mm Macro Reverse Ring Adapter new H211 US $2.85

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lensa adapter 49mm Macro Reverse Adapter Ring For OM4/3 US $6.50

Free shipping worldwide 58mm Macro Reverse Adapter Ring for CANON EOS EF Mount US $3.24

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49mm Camera Reverse Macro Adapter Ring Black for Nikon US $7.68

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49mm Reverse Macro Lens Blk Adapter Ring for Canon EOS US $7.90

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You need to do some more research before you go any further because you are, for a lack of a better description, clueless. First thing: You can't meter or use autofocus using a bellows anyway, so finding a teleconverter that can meter or AF is a moot point. Second: You won't achieve extreme macro (which I define as at least 20x magnification) with a regular lens, even a macro lens. Although your sigma 70-300mm 1:4-5.6 D DL macro super isn't really a macro lens, it simply focuses closer than a normal 70-300mm telezoom (which normally needs at least 4 feet to focus), at the cost of reducing magnification. Example: 300mm ain't 300mm when you're at close focus (or macro), it's more like 140mm. It's just a way to sell lenses without going through the trouble of explaining the lack of close focus correction, which makes a lens more expensive. Your OS, GONE. You won't need it. When you shoot macro, especially extreme macro, you're stopped down to like f/32, and on a tripod. Optical stabilization is useless for macro. Third: The TC201 will not meter, but will work (I have one and use it on my D90)....just not necessarily with a sigma lens, or rather any 3x telezoom that isn't in the pro category. At the short end, the rear element will impact the front element of the teleconverter. There are few options. But realistically, you don't need it. You don't need a longer focal length, you need a reduction of focus distance. The closer you can focus on an object, the more it will be magnified. Unfortunately, the ability to do just that comes at a price. Attempting to do it all bargain basement will result in disappointment. Trust me. However, if you are intent upon trying it, there is a simpler way: Use your 18-50, get a reversal ring to match it's filter diameter with 52mm on the other side. Then get a nikkor 50mm f/1.8, which is like $100. Put it on back to front and you'll get a cm or two from what you want to get super macro. That'll get you there., but it won't be earth shattering. It does work, though.

Check this link out:

http://nikonrumors.com/2010/12/15/guest-post-nikkor-19mm-f2-8-macro-lens-review-part-2.aspx

Now that's how you do extreme macro.

Here's more on the lens, which is a very rare nikkor macro, that is basically a really old, really expensive microscope lens.

http://nikonrumors.com/2010/12/14/guest-post-nikkor-19mm-f2-8-macro-lens-review.aspx

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