I use to own a tamron 60mm f2 macro lens for d7100 and I loved it. but sometime last year my gear got stolen. I was able to afford a new camera but at this point in time the funds are not there for a new macro lens. So I decided to go with some extension tubes. They are cheap and well within my budget. I knew some of the limitation on extension tubes i.e. loosing infinity focus, loosing stops of lights and limited working distance. so with this in mind, I will give you my honest opinion, they are made of plastic the coupling rings on the lens side are made of metal but the camera side are plastic. The locking mechanism seems a little rough but secure when attached to the camera and the lens. I tried using all three together and though the camera was still reading the lens, the lens would not focus with my 50mm 1.8d. I tried it with a dx lens and it worked fine. I think the mechanical linkage to drive the focus ring disengages with the weight. Individually did not have any issues or with two. camera was loud focusing with the 1.8d. As far as test pictures, I was impressed. I would recommend getting some kind of ring light. Pictures I have attached are with my 50mm 1.8d. first shot is with no rings attached at about 18in. second is with the 36mm at about 2 inches, third is the 20mm at about 4in and the last is the 12mm at about 6in. all mounted on a tripod. Would I recommend these.. if you are on a budget and don't have the money for a macro lens go for it. But if you have the money buy a dedicated macro lens they are more versatile than these rings.

It does what it says on the box. Well manufactured and sturdy, good solid connection to camera and lens. Great for budget macro shooting. Autofocus does work, but better off using manual.

I love shooting nature photos, i.e. flowers, bugs, butterflies etc and this extension tube fits the bill for my Nikon D7500 and my older D100 camera. It's best to use a 50mm lens and then just play around with the shot you want. Close, closer, closest . The price was good too.

El enfoque automático, es mejor dejarlo de lado, calza muy bien y las imágenes son de buena calidad, el problema está en como se siente el material, es un plástico de de calidad dudosa.

I bought these because I was interested in trying out macro photography and didn't want to drop a couple hundred dollars on a lens. At $40, these were a great way to start. They work as advertised, and I haven't had any issues with auto focus on any of the lenses with which I have used them. I've tried it with my Nikon 35 mm prime lens, my Yongnuo 50 mm prime lens, and the two kit lenses that came with my camera. I attached the 70 mm - 300 mm lens to all three tubes and autofocus worked fine.

Build quality is decent. They're plastic, but sturdy. The prime lenses are a bit tight when attaching, but they do click into place. The releases are OK, but it did take a little to get used to them.

The first attached picture is a focus-stacked (4 images) shot of a coffee bean. I used my 35 mm lens with the 36 mm tube to get an almost 1:1 shot. I know it's a bit off in a couple of areas, but this was handheld and I was really just looking to see if the tubes worked as advertised. I'm happy to say they do. The second is taken with the 70 mm - 300 mm zoom lens at 300 mm using all three tubes.