I read this comprehensive review before purchase and you should too:http://www.imaging-resource.com/PRODS/canon-eos-m/canon-eos-mA.HTMI'm an amatuer photog for more than 40 years. Until recently, my only concession to digital photography was the purchase of inexpensive Canon point-n-shoots. As film photography has become a greater burden and digital has caught up in terms of quality while surpassing in convenience and affordability, my discovery of this little gem at a bargain price was perfect timing. Adding a $15 adapter, I can use may ancient but excellent FD mount Canon lenses - think F1 and AE-1 cameras. Auto-focus speed doesn't matter to me because I still prefer to manually set almost everything. That said, the AF performance of the EOS M seems equivalent to that of my son's Nikon 1.My purchases for my entry into serious digital photography to date include: the EOS M with Speedlite 90EX and EOS M 18-55mm IS lense: an SD card (PNY 64 GB High Speed SDXC Class 10): a spare battery (Opteka LP-E12 LPE12 2000mAh Battery Pack): a lense adapter (Fotasy Canon FD Lens to EOS M Lens); and a neck strap (OP/TECH USA System Connector Super Pro A).

Are use this Lens mount on my new canon M 50, unfortunately the camera was defective but the lense mount did its job.

THE BEST LENSE I HAVE EVER OWNED. I cant even tell you how happy I am with it.I use it with my Canon t3i and I wont use anything else!

I got this lens a while a go...the first copy was defected but the second one was the right one....is very sharp considering that is not L series...but the focusing system is very fast...I can focus almost instantaneously...is fantastic considering the fact that is 4-5.6 lens....for everyday shots is very good...I was debating between the version of 70-300 L and this one and I'm glad that that i choose this one...considering the price.... now compared to the 70-300 Nikon version is faster and sharper without doubts,, i have Nikon and canon full frames and regarding to the 70-300 range...this canon beat the Nikon one....for sure...

Well, well, well..This lense is known to be one of the best Canon lense.It gives excellent pictures, fast focusing, and is very helpful through excellent Image Stabilizing mechanism.HOWEVER, with $1700 price tag, any defect/quality control issue should be disclosed to this lense users.Many lenses with serial number of UT08XX or earlier, there is phenomenon on the lense surface that you can see numerous "bubble" or "milky way". Newer ones do not have this phenomenon. You can see the phenomenon by illuminating a flash light through the front of the lense and looking at the mount part of the lense. If you happened to own this kind of lense, please check yours, and have the IS unit serviced by official Canon service center before the one-year warranty expires.

nice fit and works great with both my Canon and my Nikon

Canon and Nikon need to take notice before of the word value

This is a fantastic lense, a must have for the canon M series camera. Nice and compact.