
Theses work great; Autofocus works on all my old D-type (mechanical screw drive), AF-S (ultrasonic) and newest AF-P (stepper motor) lenses. They shield diffuse light well inside and have strong bayonet mounts. The body is lightweight plastic but seems sturdy enough for moderate use but lacks weather protection. So, obviously not a pro, but excellent for its price. I already have a good 1:1 macro lens (Microniccore 105/2.8) but wish I could easily leave my macro travel tubes at home and also use them with super telephoto lenses to lower the minimum focusing distance for small shy subjects like hummingbirds. Some bad reviews seem to come from people who don't understand how macro photography and autofocus work. As you move the lens away from the sensor to focus closer, the effective aperture increases compared to the lens's original aperture (bellows effect). Entry-level cameras only have an autofocus from uo to f/5.6. If you're using an f/5.6 kit lens with an extension tube, you're likely to run into problems. High-end cameras automatically focus down to f/8, while lower f# lenses, such as

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