Mcoplus EXT-M4/3-M Automatic Extension Tube for Olympus Panasonic Micro 4/3 System Camera（10 16 21）

This unit worked flawlessly from day one. It fits just like it should, as if it were made by the camera maker. The price is surprising given the quality of materials and build. Sure beats the original manufacturer's price of over three times the cost. Auto-focus function is just as if the lens were merely mounted on the camera, no delay, no extra shifting, etc. No problems with color shifts or distortions in the final images. NO flare! This used to be problematical in some tubes in the past. Not intended for seriously high-magnification work, nevertheless extremely useful for close-ups at one-half life size and larger, without having to use the camera's built-in "macro" features, which, in my opinion are quite useless. This is a durable piece of kit to keep with the camera all the time "just in case".

I bought these to take the magnification of my Olympus Zuiko digital Macro 50mm f2 from 1:2 to 1:1. So far they work very well with it on micro four thirds and they support the autofocus (I use AF in maro sometimes) and the aperture control from the camera, as well the manual focus (focus by wire, sso it needs too the dialogue with the camera. They are also pretty affordable. Highly reccommended.

I bought the plastic mount version of this set of extension rings. It’s just fine.The job of an extension ring is to move the back of the lens farther from the flange on the body to enable the lens to focus closer than it could just using the lens’s focusing helix. It has to hold the lens rigidly and also parallel to the mounting flange. That can be a tall order given the weight and length of some zoom lenses. Nevertheless, the Mcoplus tubes worked well. I did not notice any change in sharpness across the focal plane nor did the lens seem to drop as some cheap zooms can.BUT, this is a set of extension tubes; it is not a macro lens. Zoom lenses were not designed to work close to the subject. Neither were most primes. If the lenses retained their sharpness close up, the lens makers would likely have called them “macro” and given them closer focusing mounts!Most zoom lenses are not parfocal, meaning when zoomed from wide to tele you have to refocus slightly. That problem is greatly complicated on an extension ring. Image quality definitely suffers, and you will find that the behavior of the zoom changes. Full ‘tele’ may not show as much magnification as a slightly wider setting.In an ‘emergency’ you can use an extension ring with even a long zoom if getting a slightly soft picture is better than not getting any picture. All of the above is true with any extension ring at all, no matter how precise, rigid and expensive.I do not recommend any extension ring with any zoom lens whatsoever. Period. Nevertheless, who am I kidding? I still use extension rings with zooms. But I know the pitfalls and what to expect. For best results use extension rings with prime lenses, stop down at least two stops if the light is good. YMMV. Caveat photog.After all of these cautions, let me turn to this set of rings. They are very nicely finished at the price. They are quite rigid. They are well made. And they mount easily to both lens and body of my Olympus M4/3 kit. They properly pass information between lens and body so that auto exposure modes work. I have not checked all my lenses and bodies, but with both tubes used at high magnification together I think the autofocus hunts a bit and doesn’t always get the exactly right point of sharpest focus, but it gets close. Note that this is not the fault of these extension tubes; it has to do with the focus detection system in the camera not working as well with the dimmer image and the very much reduced depth of field at small lens-to-subject distance. That’s just physics. And why anybody using extension rings should learn to use manual focusing with focus peaking turned on.I have an Oly 75mm f/2.8 macro; it’s a brilliant lens. But it is big and heavy. I carry it when I’m specifically expecting to take close-up pictures. I don’t have it with me all the time. But I always have either my 17 mm or 25 mm prime, and I always have one of these rings in a pocket of my camera bag. So I can always get a bit closer than otherwise and get a decent picture.On a vacation last fall I took several hundred pictures. I used an extension tube for perhaps a dozen shots. That’s the duty cycle I expected. At that rate the plastic lens mounts are likely to last for decades. After all, most combat aircraft are built from ‘composites’ these days.I’m happy with my purchase. For about twenty bucks I’ve got a reliable set of autofocus/autoexposure extension rings. Not as pretty as a set from Olympus or Panasonic, but they work well in limited duty for what, 20%, of the cost of the OEM unit.Now, could the same makers build a teleconverter with a four element Barlow lens and a 1.4X magnification, also for limited duty in a pinch when a little extra magnification would come in handy?

Look like my review is the first for this item. This item deserves a review.When I ordered, the price was $26 (right now it's sitting at $48). This item and the box it came in are Meike branded. The "A" at the end of the model name, I believe, indicates a metal mounting ring. The same model with "B" at the end have plastic mounting rings. This seems consistent across the different lens mounts (Nikon, Canon, etc)For the price it seems quite good quality. The body is plastic. The mounting ring appears to be metal, but it's very light and not magnetic. Everything fits together nicely, not loose, not overly tight. The contacts work, I tried the stack with Oly 45mm 1.8. I was able to change aperture and focus.These tubes seem like quite a good choice in this price range for m43. Highly recommend. I'll update the review if/when warranted.

On my Olympus OM-D EM-10, There is an issue where I sometimes need to do a manual assist to fine-tune the focus, using Olympus lenses. I have the 35mm prime lens, which I believe is too much lens. I will have to get something in the 17mm to 24mm range.That is what I use when I use my Nikon F glass, with an adapter and the extension tubes for them. With the small sensor size, I use my 24mm f/1.8 to get usable images.Otherwise, I get great magnification and the focusing is quick and accurate.If you are experiencing darker images if you are using these extenders, you need to remember that even if you are using Olympus lenses for your micro 4/3rds camera, you need to multiply your f-stop by the crop factor as well as you do with your focal length. This will also help with depth of field as well.This is a good product to add to your photo bag, and if you can, get the smallest focal length that you can afford.

What i thought for 40 dollars would be a decent enough extension tube set for the price turned out to be a nightmare. I guess I learned the hard way to stay away from things like this with cheap quality builds. Hopefully I can get my camera repaired but there's more money down the drain.