|
I doubt either lens will be sharp enough for astro work when they're wide open. It's more of a build quality thing, like John said. Both lenses probably need to be stopped down for a sharp image accross the entire field of view. The 1.4 should be the better of the two. I'd prefer the 8 blade diaphragm as well but the expense over the 1.8 is significant. I went through this a couple of years ago buying a Nikon 50mm. They have virtually the same options, a cheap 1.8 and an exspensive 1.4. Looking back I'm glad I paid the extra for the 1.4, the build quality is just far better.
|