Hey guys, hoping you might have some insights. I shoot a lot of macro and intimate landscapes (mostly waterfalls) with my 5DS. For macro I have a nice setup with the 100 2.8 IS L, but for landscapes I use my 24-105 IS L. It's a nice, versatile lens, but the distortion, vignetting (made worse when paired with a vignetting filter), and corner sharpness at 24-28mm (my most-shot focal length with that lens) leaves a lot to be desired. I like to shoot live view on a tripod, and sometimes with a 10 stop ND filter when I use it. I will sometimes handhold and actually prefer that if possible, but the 5DS prefers a tripod so that's what I give it haha.
I was wondering if you guys have any advice on either mitigating said issues with the 24-105 L, or any suggestions on lens. I'm really not worried about the longer focal lengths of that range since I have the 100 L. I've been researching lens like the Canon 16-35 f4 IS L and the Sigma 24 f1.4 to hit that 24mm focal length and would like something new to my kit, not just a replacement (e.g. I don't own any f1.4 lens and I don't have anything wider than 24mm). Bit of pre-reqs, I use ND filters and (sometimes) polarizers for waterfalls so it needs to be able to accept filters. Additionally, I'd prefer good build/weather sealing (e.g. protect from waterfall mist and rain). I like AF, but it's not mandatory. I have looked at the TS/E lens from Canon and they're amazing, but probably more than I should spend lol.