TriX wrote:
I doubt if you need anything much wider than 18-20 mm indoors. Going wider risks inaccurate images that look nothing like the actual space as mentioned above. If price in the $400 range is important, I would certainly consider the Canon 17-40 f4L if the 16-35 f4L is too pricey - it’s an excellent lens for the $. Regarding your images, I congratulate you for keeping your vertical lines vertical and parallel.
17-40 is more in my range, I May just try using my 80D and my 17-70 2.8.