El producto llegó en la fecha programada. Los materiales son de excelente calidad, los tubos se sienten muy sólidos y durables. Cabe agregar que las conexiones eléctricas funcionan muy bien, permitiendo que la cámara sepa que tiene un objetivo instalado, también permiten controlar el diafragma y el foco desde el cuerpo de la cámara (cabe agregar que para macro fotografía es recomendable enfocar manualmente). En fin, un producto altamente recomendable.

The adapters were as advertised. They are easy to fix and I am learning new tricks.

Actualización (cambio mi calificación de 1 a 3 estrellas): El tubo de 36mm quedó atorado en mi lente 55-300mm, lo pude quitar bajando el pin con unas pinzas. Los de 12 y 20mm los probé en un 50mm (1.4 manual) y los pude quitar sin problema pero definitivamente puede llegar a ser frustante, no intenten quitarlo a la fuerza (sobre todo en lentes con bayoneta de plástico porque pueden dañarlo).

I bought these to play around taking macro photos of flowers without buying a macro lens. They work great, and I can get some really good pictures. The fitting is a bit snug, but not concerning. Autofocus works great. For the low cost, they are a fun way to try something new.

This is a very good alternative to the expensive macro lenses if you want to experiment with macro photography. The build quality is good and so are the lens controls and it does the work as advertised. It fumbles a bit with auto-focus at times but it's manageable as macro requires manual focus mostly. You need to consider the stops of light lost because of the tube. The aperture lever is very loose and makes sound when you move the tubes. It doesn't have a spring action like in the regular lens which can be improved though it works properly. Hope it's not a problem with my piece only. Master Digital seller has been very responsive in answering queries. They even assure you to support if you face any issue during usage. The product packing was good and was delivered in good condition though the outside box was crumpled a bit in transit. Will post photos on my insta account @aris_cliqs.

MEIKE MK-N-AF1-A Macro Auto Focus Extension TubesIn short, these three tubes worked absolutely fine, with no problems in every combination I tried them with three Nikon bodies and two Nikon and one Tamron lens.They each fit one another, and the three cameras and three lenses I tried with them snugly, but not the crazy-tight connection some have reported with extension tubes. Attachments are smooth, firm, and lock with a satisfying click.The set I received looks great, had good quality control, and work in all ways tested for me with several cameras and lenses. My set is just what I hoped for. I sincerely hope other buyers have the good luck I had with my set of Meike Nikon AF macro extension tubes.I ordered from this particular Amazon page because it lists the extension tubes part number as MK-N-AF1-A. This set, the ones shown here and that I received, have chromed metal surfaces where each tube attaches to the camera body, or one another, and also the chromed metal surfaces on the lens attaching ends of ALL three tubes in this set.The bodies of these extension tubes are all plastic. The good quality, high-impact plastic that is sturdy and strong, but still plastic and NOT metal. Only the six tube ends are chromed metal where attachments are made.As best I can tell, Meike makes as set of extension tubes much like this where the end that attaches to a camera mount or other tube is plastic, with no chromed metal surface, while the lens ends of those tubes are metal.I specifically wanted the Meike extension tube set for nikon with metal surfaces on both ends of all tubes, and the electrical contacts and screw drive autofocus mechanisms.I have a Nikon D750 and access to my daughters' Nikon D3200 and D90 cameras.This set of tubes worked, one at a time, with my D750 and the Nikon 50mm f/1.8G lens. Autofocus and aperture changes worked fine with each extension tube up to and including all three of them stacked.This set of tubes worked, one at a time, with my D750 and a Tamron SP Di AF 90mm f/2.8 screw mount lens. Autofocus and aperture changes worked fine with each extension tube up to and including all three of them stacked. I was really impressed that the AF worked with all the tubes stacked though I use manual focus with macro pretty much exclusively. Having the tubes working as advertised, even with an older, third party screw drive AF lens was a good test of these tubes workmanship and alighnment.I used the tubes with one daughters Nikon D90, the same Tamron 90mm Macro screw drive AF lens as described above and a Nikon 18-55mm kit lens. All combinations worked, even the Tamron, since the D90 has screw drive AF capability. Controlling the apertures and the focus on the kit zoom and the Tamron Macro worked without problems for me.I used the tubes with my other daughter's Nikon D3200, a Nikon 18-55mm kit lens and the Nikon 50mm f/1.8G lens. All combinations worked, with the D3200, the various Meike tubes, the kit 18-55mm zome, and the 50mm f/1.8G, in controlling the apertures and the focus.I would absolutely love for Nikon to make a fully metal set of AF extension tubes, but then they'd probably charge $150US for each, and $400US for all three as a set.Since I won't be using these daily, these $50 Meike extension tubes have alread exceeded my expectations, and I've already been having fun trying to determine some fun, neat, repeatable setups for some in home macro work. Health problems keeps me inside more than I'd like, and these tubes add more macro options to my kit than just my Tamron 90mm Macro.With all three of these tubes stacked, and using my Tamron 90mm 1:1 macro on my D750, I get a magnification of 1.64, well over half again the subject's original size. Sweet.

Perfect for my needs.