I am in the market for a new lens for Architectural photography. I have a Tamron 10-24mm that I use for the majority of my interior shot now, and I use my 18-55mm and 50mm /1.8 now. I find that the majority of my pictures are the most crisp from my 50mm by far and I am going to delve further into prime lenses. Keep in mind my shots are almost always going to be composed and on a tripod, so a super low aperture doesn't matter as much as image quality. Manual focus is also ok.
Don't bring up a tilt/shift lens. I know that's the direction I need to head, but I cannot swing one right now. I'd like to spend $300-750 or so on this lens.
I'm inclined towards the Canon 24mm f/2.8, Sigma f/1.4, Canon 20mm f/2.8. Any other suggestions for sharp, fairly wide lenses? Samples are appreciated as well. I am now shooting with a 50D, but will probably go FF in a year or so.
Thanks for the help...