Kenko DG Extension Tube for Sony E FF

Using both tubes (10+16) on the A7R4 full frame sensor resulted in a 0.7x magnification @ 105mm, versus 0.33x originally. Leaves more than 3" distance between the glass and the subject. Autofocus still works perfectly. Also tried them on the 16-35mm GM, but the distance to subject is minuscule, not appropriate for my needs.These tubes are well made, with black felt / velvet in the inner barrel to cut down on stray reflections. Most of the cheaper tubes seem to be just bare plastic barrel, with evident glare. Except maybe the Vello Deluxe ?Reminder: the focal plane w tubes remains convex (spherical) per your lens's focus plane's shape. A true macro lens is supposed to have a flat focal plane. So on flat subjects, w tubes and fast aperture, if the center is in focus, the edges won't be, and vice versa. So, it's good for concave subjects ("better" than true macro lens), but will require more careful focusing techniques (small aperture or stacking) for flat or convex subjects (like insects). Excellent youtube video on the topic: "Macro Lens vs Extension Tubes by @PhotoJoseph - what's the difference"

I read about the tubes on line and thought that I would pick up a set. They work perfectly.

Ringarna verkar välgjorda och är i metall förutom den antireflekterande beläggningen, de sitter tätt och bra på kameran, men frontfästet är alldeles för löst. Om du försöker fokusera med objektivets fokuseringsring, roterar objektivet först, sedan fokus. Det är alldeles för mycket glapp mellan ringen och objektivet. Till detta pris förväntade jag mig en mycket bättre passform. Uppenbarligen finns inga anvendbara mellanringar på marknaden, köpare av den billigare ringer berätter om skador av objektivet eller kameran, det vill jag inte riskera.Jag har äntligen hittat makroringar som är av bra kvalitet och passform: Commlite. Och de kostar bara ungefär en tredjedel av Kenko-ringarna.

I have owned these extension tubes for just over a year and had what I can only describe as a critical failure from these extension tubes. At some stage the spring which is responsible for locking in the lens failed (see photos) , I did not notice it and the end result was my 90MM Sony FE macro lens ended up releasing from the extension tube and hitting solid concrete, it no longer works and will need repairs which i cant get during this lockdown period. To say I am dissapointed in this product would be an understatment, it did not survive even 2 springtime worth of use and I now have to pay for repairs on a very expensive and loved lens. These extension tubes were not cheap and I certainly expected better quality from them. I will be seeking a refund and will advice everyone to stay away

Comunica el objetivo con la cámara aunque con algunas limitaciones. Queda un poco de olgura y el objetivo se mueve ligeramente, para el precio no debería pasar, pero bien.