Possibly an obscure question. I have a weathered "old" Sony NEX F3 which I rather like as a lightweight travel camera on city breaks etc. I've come to realise that although the 16-50 f/3.5-5.6 lens is decent enough for my trivial snapshots, and is fairly compact and light, I very rarely use it on anything other than wide settings.
Anyone any thoughts on replacing it with the Sigma 19mm f/2.8? I'm not bothered about the speed change, I'll have to think about the "less wide" aspect but could probably quickly adjust to it (1.5 "crop factor" - yes I know I know - means going from "24mm equivalent" to "28.5mm equivalent" - yes I know I know).
Will I really notice a change in optical quality? The Sigma is not exactly a compact little beast, actually 24g heavier than the zoom and 15mm longer which might make the whole camera less appealing as a lightweight travel toy (I barely notice the weight at the moment if I am just wandering around cities)
Second hand prices are reasonable and I can sell the 16-50mm. Wonder if I'll regret it though.
Some context, I do have a Canon dSLR with these lenses: 18-135, 50mm, 55-250mm, 100mm. I use mostly the 50mm and 100mm on that. I sold the original 18-55 "kit lens" and haven't missed it. I got the 55-250mm very cheap in a charity shop, it's a cheap Sigma, it is OK for the £20 I paid! The 18-135 I got as "a heavier walkaround" and don't seem to use it much to be honest. It's as if I am geared toward primes (although further context is the Canon gets used almost only for low light concert situations!)