I'm looking at getting a new lens for my Canon 6D (full frame) around the 40 to 50mm mark. Obviously the core purpose of the lens will be for astro images, especially for when I use the Polarie. I'm also getting it for travelling as well to have a smaller, lighter kit to use.
There's a few options around, with the Canon EF 40mm f/2.8 STM looking quite appealing. Has anyone got this and used it for astro? Should I look for faster lenses instead and go to 50mm for f/1.8 or f/1.4? Btw, I have no problems buying other brands, e.g. Sigma, etc if they're suitable.
Any thoughts or suggestions appreciated, especially any gotchas I need to keep in mind.
Btw, I didn't win lotto, so I think the "L" series lenses are out of budget at this time. *sigh*
