I recommend a different option. Buy her a little used mirrorless camera. For a truly good camera with little cash outlay I recommend a NEX 7 or NEX 6. For a little more money you can get a Fuji XT1.
Then find a good, cheap little 35/2.8 manual focus film lens. Something from Minolta or Yashica, Pentax or Canon will do fine. Then buy her the appropriate adapter to mount the lens on the camera.
I looked up the price of a Sony Nex 6 body and saw it is the same price as the Canon body's I'm looking at so you got my attention. That is until I saw the prices of lenses for E-mount -WOW. Now I understand why you recommended getting and adapter for a cheap 35mm film lens.
Im not sure what prices you are seeing for used cameras. I honestly dont know what those Canons are worth or what they go for. I recommend you check the used prices on KEH.com which is a great site for buying used.
Also not sure what E mount lenses you are looking at. If you are looking at the Full Frame lenses for E then yes, they can get pretty expensive. But there are plenty of inexpensive apsc options available that would fit natively on the Nex from Sony, and Sigma makes some very nice options as well.
The reason I was recommending old film lenses though wasnt the price. I mean, they can be very, very inexpensive. Especially when you consider the image quality they can produce. But I was more talking about how this combo will teach her things in a certain way. It slows down and breaks up the shooting process into little chunks that are more easily understandable.
For instance, when she racks the aperture ring back and forth (on the lens) while seeing the immediate effect in the EVF on how this effects bokeh, well...that is a huge visual aide to understanding the component parts of exposure and image creation. She will understand that
this part of the lens is what controls
that specific effect. When she changes exposure comp and sees the image darken or lighten...again, its a big help to understanding what the camera sees and how to manipulate that to get the desired effect.
I use to be a Sony shooter back in the early 2000's until I switched over to Canon about 10 years ago and never left. Am I wed locked to Canon? No. But being able to loan her one of my lenses is a plus (if/when she is ready).
Lens sharing is a good option to have. But if she likes the little NEX then getting her a decent set of old vintage primes wont put you out much at all. And if she wanted an AF lens then those Sigmas are pretty inexpensive as I said.
But if she likes photography and wants to get serious then there are plenty of Sony FF options down the road you can get her that can adapt your Canon lenses with mostly full functionality using the Metabones or Sigma adapters. Heck, you might even find yourself using her FF mirrorless more than she does lol.
These are all just some thoughts and suggestions. I hope you find something that works for her.
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