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Can't remove extension ring set from my lens
#1

I bought a cheap set of extension tubes on e-bay. To try it I mounted put the adapter ring onto my Sigma 18-200 mm lens. The rings screw into the adapter. Now I can't get the adapter off. There is no visible lever or button to release it. Does anyone know what to do?

Nikon D3100 with Tokina 28-70mm f3.5, (I like to use a Vivitar .43x aux on the 28-70mm Tokina), Nikkor 10.5 mm fisheye, Quanteray 70-300mm f4.5, ProOptic 500 mm f6.3 mirror lens. http://donschaefferphoto.blogspot.com/
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#2

I figured it out.

Nikon D3100 with Tokina 28-70mm f3.5, (I like to use a Vivitar .43x aux on the 28-70mm Tokina), Nikkor 10.5 mm fisheye, Quanteray 70-300mm f4.5, ProOptic 500 mm f6.3 mirror lens. http://donschaefferphoto.blogspot.com/
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#3

Good - I had nothing to suggest.
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#4

Nobody did. Lol

Nikon D3100 with Tokina 28-70mm f3.5, (I like to use a Vivitar .43x aux on the 28-70mm Tokina), Nikkor 10.5 mm fisheye, Quanteray 70-300mm f4.5, ProOptic 500 mm f6.3 mirror lens. http://donschaefferphoto.blogspot.com/
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#5

After I figured out how to un-attach the ring from the lens, I tried it. Of course the extension rings really reduce light input. I needed my speedlight to illuminate the subjects. It was also very hard to see well enough to focus. But on some elementary easy subjects I got some interesting results. Here three rings (about 1 3/8 inches of extension) were used.


[Image: fingernailSM.jpg]
The fingernail of a painter


[Image: fingerprintSM.jpg]
Fingerprint


[Image: deadleafSM.jpg]
Dead Leaf


[Image: flowerpartSM.jpg]
The Spent Stamen


[Image: flowerpart2SM.jpg]
Another Stamen

Nikon D3100 with Tokina 28-70mm f3.5, (I like to use a Vivitar .43x aux on the 28-70mm Tokina), Nikkor 10.5 mm fisheye, Quanteray 70-300mm f4.5, ProOptic 500 mm f6.3 mirror lens. http://donschaefferphoto.blogspot.com/
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#6

Cool shots, Don! I'm always amazed that I don't do more macro shooting - its a crazy world down there. Special kudos for 3 and 5.
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#7

thanks Toad

Nikon D3100 with Tokina 28-70mm f3.5, (I like to use a Vivitar .43x aux on the 28-70mm Tokina), Nikkor 10.5 mm fisheye, Quanteray 70-300mm f4.5, ProOptic 500 mm f6.3 mirror lens. http://donschaefferphoto.blogspot.com/
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#8

I cant tell you how relieved I was as I scrolled down and realised that you hadn't been taking pictures of raw sides of pork!! A finger nail. Phew!! What a steady hand.
I love extension rings. If you know how to calculate the effect each one will have on particular lenses - could you drop in a reply please? I cannot get my head around them and end up just swapping them around till I get the effect I want. Possibly not the best approach!!
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#9

Well I sold the Sigma lens and stopped using rings. I bought a couple of macro type lenses which work much better plus a magnifying lens and a macro camera.

Nikon D3100 with Tokina 28-70mm f3.5, (I like to use a Vivitar .43x aux on the 28-70mm Tokina), Nikkor 10.5 mm fisheye, Quanteray 70-300mm f4.5, ProOptic 500 mm f6.3 mirror lens. http://donschaefferphoto.blogspot.com/
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#10

(Oct 22, 2010, 12:58)Don Schaeffer Wrote:  I bought a cheap set of extension tubes on e-bay. To try it I mounted put the adapter ring onto my Sigma 18-200 mm lens. The rings screw into the adapter. Now I can't get the adapter off. There is no visible lever or button to release it. Does anyone know what to do?

The adapter rings I've got have a small button where it attaches to the lens, this is attached to a pin which locks into the lens. To release pull the button away from the lens. If the button has unscrewed then there will be a small slot with a hole at the bottom, using a pin you can ease the locking pin on the holder out of the lens. Hope this helps

Happy new year

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#11

Thanks Tony. That was a while ago.

Nikon D3100 with Tokina 28-70mm f3.5, (I like to use a Vivitar .43x aux on the 28-70mm Tokina), Nikkor 10.5 mm fisheye, Quanteray 70-300mm f4.5, ProOptic 500 mm f6.3 mirror lens. http://donschaefferphoto.blogspot.com/
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