>>3854486>Not really, you can buy pretty any broken Sigma lens for EF to use as a donor.Not necessarily. The mount part of the lens might be slightly different depending on the model lens (e.g., the hole at the back might be a different size depending on how much the rear element moves between the donor lens and his SA lens).
Additionally, while it's true that the SA protocol is just EF in a trenchcoat and sunglasses, it's *Sigma's implementation* of EF, which has not always been a perfect imitation. Notably, older Sigma lenses designed for film-era EOS bodies often don't work properly on modern digital bodies (or even the final generation of film bodies). So there's no guarantee that the EF protocol being spoken by his SA lens would be compatible with the EF protocol being spoken by his modern T7.
Regardless, even if it is possible and he gets ahold of a Canon-mount version of that same lens, it's still going to be a non-trivial effort to convert. I did some googling and the process likely involves soldering, for instance. So maybe he'll save twenty bucks or so, but it's gonna be a hassle, and he might be out even more money if it's his first time soldering (remember: heat the work, not the solder).
And even if everything goes perfectly, the reward is... A shitty film-era kit lens that only has slightly more reach and much less image quality than his kit lens. Oh, and now he doesn't have a lens for his Sigma camera body if he ever wants to shoot with that.
Here:
https://www.keh.com/shop/canon-ef-28-80mm-f-3-5-5-6-ii-standard-zoom-lens.htmlGenuine Canon EF 28-80, forty-three bucks. Or even better, spend a little bit more and get a lens that's actually worth spending any money on. Frankly, the Sigma 28-80 f/3.5-5.6 is not worth the amount of time we've spent discussing it.
