08-09-2016, 01:54 AM
What about Canon 16-35mm f/4L IS - not as fast but thanks to the image stabilizer, it should be equiv. to at least "f/2", maybe even "f/1.4" - and it provides more DoF in those situations than those prime lenses. This assumes that the resulting slower shutter speed is Ok for you though (thus an emphasised bridalveil effect on waterfalls) .
The Sigma 20mm f/1.4 ART may be also worth a look.
Waterfalls can be a bit tough in terms of spray ... depends on how close you wonna get.
I'm slightly wondering about the "low light" requirement. Iceland may have some bad weather but it's not as if there's no good one. The weather is frequently changing actually. Or are you deliberately intending to shoot at dusk/dawn or during winter time?
The Sigma 20mm f/1.4 ART may be also worth a look.
Waterfalls can be a bit tough in terms of spray ... depends on how close you wonna get.
I'm slightly wondering about the "low light" requirement. Iceland may have some bad weather but it's not as if there's no good one. The weather is frequently changing actually. Or are you deliberately intending to shoot at dusk/dawn or during winter time?