I purchased this adapter along with the EOS M camera kit to use with my EF and EF-S lenses. After less than a week, I have been able to try out with the EF 50mm F1.4, EF 70-300mm L, EF-S 17-85mm, and EF-S 60mm lenses. The adapter fits perfectly. Same form and fit as the Canon extenders I have. The EOS M is of course made very tiny with any large EF lens. It creates a sort of 'pocket Rebel'. Of course, once you mate with the larger lens, this is no longer going to fit in anything less than a massive coat pocket. The combination of camera, adapter, and lens seems comfortable after brief handling. The EF 50mm was a very comfortable combination, the adapter does not add a very large amount to the overall combination. The upside to this adapter is if you already have a variety of EF and/or EF-S lenses. The image quality of the JPEGs, right out of the camera ranged from expected to stunning (the latter results obtainable with off camera studio flash strobe and soft box). The adapter was immediately a huge part of the EOS M camera purchase. I highly recommend it if you have other lenses. Again, the results I got with the EF-S 60mm macro (and studio lighting) were stunning. It transformed the camera from curiosity to studio prime. No problem using manual mode and Pocket Wizard. Include this adapter in your purchase and you won't be looking back.

This camera is absolutely amazing - those two pictures are from nearly 1 mile away! The color and 20x resolution or the optical zoom is top notch. One thing I will say is DO NOT count on their tech support - it is horrible - nearly nonexistent and if you do go through the hoops of talking to someone - the language barrier is a huge issue!

Perfect with an adapter for my Canon SX40. Thanks!

My SUNBA 20X Optical Zoom PoE+ Mini Outdoor PTZ Camera works beauifully! I needed help using PTZ so I contacted Tech Support which joined me through screen sharing. I was given a quick and easy tutorial. Thank you Sunba!

My Canon PowerShot SX280 12.1MP Digital Camera with 20x Optical Image fits perfectly.The outer pocket is roomy enough to store extra batteries and has an interior side pocket that can hold a memory card.

The zoomed out all the way full 20x zoom and I can see the clarity of the images from over 200 feet away for the object.

This 5MP security camera with 20x zoom and a 1000ft view distance is packed with features. Some the features I look for that this camera has are:-Local Storage (up to 128GB)-ONVIF support for 3rd party apps, I tested on Blue Iris, Tiny Cam, OBS, VLC-Uses CamHi or CamHiPro as there recommended Android/Apple app.-5MP image 2560x1920-H.265 and H.264 Profiles-Full PTZ with 360 degree pan and 90 degree tilt-Huge Zoom 1x all the way to 20x optical zoom-Motion + linking to human recognition alarm for less false alertsThis camera works really well when mounted up high 15 to 30 feet. There is plenty of zoom power to looks at a mouse 100 feet away with the camera 20 feet in the air.The mic's audio is clear you can hear the birds chipping in the distance and the speakers audio is loud where you can hear it clearly easily 50 feet away.The CamHi or CamHiPro app that is recommended to go with this camera is quite good. I prefer it over other proprietary camera apps I have tested. This app has been getting regular updates and is becoming quite a powerful app.The mounting arm has plenty of space to stow away all the cabling if you want to mount directly on a spot with a whole for your power plug to enter in on. This makes for a very clean look with no wiring hanging out anywhere.The Antenna has a male SMA adapter and can be upgraded if your looking for extra long range. This the provided antenna easily goes out 100 feet through 1 exterior wall of the house, this is how my setup is.

Adapter lets me use all of my other Canon lenses! Easy to use and works as designed for my canon lenses.