Ok, this might appear to be a bit of a strange question. 90% of my local photo club have Canon dSLRs, with 2 or more numbers in the model name (there is a 90D, 77D, 600D, etc.). I'm trying to help with teaching, but I don't have a Canon dSLR, in fact, I've never used a dSLR, nor an autofocus SLR! (I jumped straight from classic film cameras to digital mirrorless) So, I'm having a hard time getting my head around some of the problems that the club members are having, what should (in my mind) be a simple operation (adjust shutter speed, focus & recompose, etc) appears to require mystical incantations and finger gymnastics, attempts to help on my part just lead to things becoming even more confused. I figure that the best way to tackle this is to use the same gear - if I know how to change settings and can demonstrate, I can better teach others. But I don't intend to switch system or spend any more than the minimum (if I can keep it around €50...) So, of the older Canon dSLR models, particularly the 10D/20D/30D and the 300/350/400D, which would be the best match, control point wise, to the more recent cameras? Additionally, which is the best (least bad?) of the cheap 18-55mm kit lenses?