f/16 is an awfully small aperture for 35mm negatives. The grain of even Tri-X may become a bit mushy at that aperture. You can check sharpness at various apertures by observing the image with a fairly powerful focusing aid. I found that stopping below f/8 with the finer grain T-Max film noticeably affected sharpness in large prints. Maybe f/16 for Tri-X will be acceptable in 5x7 prints.