any serious hobbyist would eventually upgrade, the key is knowing why you would upgrade. would you upgrade because your skills have gone beyond the features of your camera or because you think a higher end model would result in better pictures? far too many upgraded to better bodies yet their shots, no offense meant, remains mediocre. there's nothing wrong with starting with an entry-level cam (mao gani "entry"). after all, it's not the camera but the photographer. hell, i've seen better pictures taken with a 2mp digicam than 12mp+ DSLRs.
Irrelevant. Regardless of it being mid, semi-pro, or pro level the principle remains the same. Would you recommend a Ferrari to something learning to drive? The D7100 has enough knobs, dials, buttons, and menus to confuse even tech-savvy people. I’ve seen too many newbies who give up photography because the technical aspect drowned them in the first few days of learning.
I'm not arguing with you by the way, just giving another perspective to those who are thinking about going into photography.
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