Works with Canon 50D & 5DM4
349742
Perfect fit for my 50D where I didn't want to spend too much. Tried it on my 5DM4 and worked fine but there I went with a dedicated RRS plate.
4963247
It works fine with Canon 50mm f/1.8 II lens. It's a snug fit to the lens without an optional hood. If I put the lens with the front-side up and the hood mounted either forward or backward, the strand doesn't close. It's also difficult to put the lens in this way. But, if I put the other way (front side down, hood still mounted), then it's fine.
3791863
I use this with a Canon 6D. I threw away the rails that came with this as I am using it with an existing set of rails & follow focus. The camera fits fine and I can access the battery door and HDMI & audio ports. The remote shutter port is partially obscured but I don't use that port with video. The build is solid and the finish is fine. All of the threaded holes run fine. I hang my Rode Videomic Pro, Tascan D40, iPhone, & bubble level off of this cage. You will want to purchase the following adapters to go with this product:

2 of BIG - 1/4" Male to 1/4" Male Threaded Screw Adapter
Kupo Hot Shoe Adapter KG006711

And here is the bubble level: Polaroid Hot Shoe Three Axis Triple Bubble Spirit Level For Canon and Nikon Digital and Film Cameras
2340626
This is a fine mid-range, medium quality telephoto lens. Works well with my Canon EOS 40D camera. All the automatic features, including focus, work well. If you have an older Canon camera that doesn't need a lens with video support, this is a good choice. It's no longer being manufactured, however, so grab one while supplies last. The price on Amazon is about half what you will pay at B&H.
882867
Had a similar tube that did not have the contacts. Got this one and now the lenses act is if they are attached without the tube in place. AF does work but a pain for macro shots as what is being photographed can move on you. The AF points do work as well. Using the Canon 60D with two EFS Lenses (28 to 135 and 70 to 300) and 1 EF lens (18 to 55) It allows control of Aperture and the image stabilizer works. In photo edit software you can look at the EXIF to see the lens that was attached as well as how it was setup during the shot. So you get full communication with the lens without any limitations. Manual, TV and AV mode work just like they would when the lenses are normally attached to the camera. Mainly have been using the 70 to 300 lens with it so I don't have to get to close, physically, to some of the thing I photograph. with sunlight (cloudy or bright) you do not really need to use a flash either. The edges of the images are also in focus.

One slight issue though, not much to worry about, there is slight play when adjusting zoom for focus. The play is where the tubes connect to the camera body. Only noticeable when change zoom to the opposite direction. Would say about half a mm worth of play. I'm sure the contacts stay in contact enough to not cause any damage to the cameras contacts. The rings fit snug together as well as the mount where the lens attaches.

Uploaded 3 pics takes through this tube on a canon 60D and the ultrasonic 70 to 300 lens.
3205224
Bought to use with my Canon Rebel T5 and it works just fine.
3904053
Using with BMPCC, Sigma 18-35 and speedbooster. No issues, helps tremendously. I'm shooting outside only and sun is everyday so I wouldn't be able to do anything without it.
4976139
Works MOST of the time on my GH4, and even when it doesn't I just have to turn the camera on and off. It's never outwardly rejected any of my Canon or Tamron glass. Fit my budget just fine until I can invest in a Metabones adapter to benefit from the extra stop.
3205578
Works well and allows easy locking and unlocking from/to body and lens. Have used the Canon 50mm F1.4 USM lens and the 18-135 IS STM on this one.
3363969
Works great with a Canon 500D/T1i, particularly for bench use. The camera is very happy with it and the wiring looks sufficient if not heavily taxed (and then may be fine). For the price, it will save money and trouble over batteries. I'll be using it for astrophotography where hours of very long and multiple exposures are common -- and touching the telescope/mount is problematic.
2626067
Works great, I use this in my Canon 70d Dslr and have no complaints. Like the write speed which has reduced lag time during rapid firing.
4299420
I bought this because I somehow lost my Canon R-5 remote and didn't feel like spending more than $5 on another. Works fine with the Canon 5D Mark II, also tested it with the Canon T2i and that works fine too. Because it's an IR, the picture is shot immediately, you don't get the 2 second delay like with the R-5 remote. I gave it 4 instead of 5 stars because the lower 3 buttons don't work on the 5D, rendering them useless for my purposes, "S" takes the picture and "2S" will trigger the video start/stop. Pretty awesome for $5 - should I ever lose this one I'd buy another one of these again (hope I don't have to though).
3664189
I've used this with my Canon EOS 70D and it works great. Works as a Class-10 should. Packaging was annoying to open and does not come with it's own case.
3007079
Works perfectly with the EOS M series and your old FD lenses
3251652
I have only gotten to experience using this guy for a few moments on a Nikon 5300 and I fell instantly in love. BUT, I have a Canon EOS T5i to be delivered soon and I expect it will fit perfectly.  Feels firm and good build quality. Only negative is when the eyepiece is tight, it is facing for the left eye... I wish it could turn a tight bit further so it would be prepared for the right eye so I can use it with my shoulder rig without fearing that it would unscrew as time went on. (It will take quite a few turns to unscrew it, so its just personal preference.)  I can see this becoming a solid part of my camera that I may not choose to remove unless I need to have my extended battery grip on it and I decide to use my 7" monitor instead.
1792657
If anyone is using the Sony FW50 batteries, yes this will work, though it looks like this was designed with the larger Canon/Nikon batteries in mind. Thankfully, the smaller FW50 batteries don't slide around too much and stay put when stored.

I was really spoiled using Canon batteries because they had plates that protected the battery contacts. This was an easy way to know if the battery was fully charged or used. If the plate was on, it was ready to use. Batteries without their plate needed recharging.

Now I use this pouch to not only keep all my batteries in one place, but to identify which ones are fresh. I orient them with the contacts down and logo facing out when they're fresh and reverse the battery when it needs recharging.

Velcro is solid, pouch material is well stitched and looks like it could stand up to some abuse. I wish these were a bit cheaper, but it's the only thing I've found that does the job. I highly recommend this pouch.
4576271
Works great, comfortable on my Nikon D550.