Sigma adapter for RF mount

[pondich7]

Hi All, I just wanted to make sure I am thinking correctly about available options for my Canon RF full frame camera. I am looking at a couple of wide angle options and currently have the small RF 16mm 2.8 which is doing a reasonable job for the time being for night sky photography. If I wanted something a hair wider and faster, there is a sigma 14mm 1.4 option with a L mount. I assume there would be a canon mount (EF?), I would then need a converter for the EF to RF mount. Correct https://100001.onl/ ?

[shadowsports]

Greetings,

Can you share the model of your camera with us please? 

The lens you are considering, a sigma 14 mm is actually f1.8.  This comes in an EF mount. The f1.4 does not.  This lenses is $1,599 plus the adapter.  That's quite a bit of money for 2mm less FL and approx 1.3 stops of light.  I'd try to buy used if you have a need for it.  

[ebiggs1]

Check out the Rokinon 14mm f/2.8 Lens for astro work. Far better choice and used by a lot a whole lot of astrophotographers. Costs way less an whole lot less.