Hello. I have a health problem that effects my ability to concentrate and for the last 2 days I haven't been able to wrap my mind around some simple calculations. If anyone could help me out I would appreciate it a lot. What I need to do is calculate the distance I need to move a gantry across a linear rail so that each photo is overlapping by say 35% for photo stitching and calculate how many photos I would need to make across the linear rail. I bought a 1500mm linear rail and with my camera on the gantry I have 1345.184 mm of horizontal travel. My camera has a cropped sensor with a 1.53 crop factor. My focal length is 50mm and the distance to my subject is 457.2mm. I calculated my camera has a: Horizontal fov of about 214.88mm (horizontal aov 26.45°) Vertical fov of 142.65mm (aov 17.73°) A diagonal fov of about 257.92mm (aov 31.5°). Well I calculated 35% of the horizontal fov is 75.21mm and if I subtract that from the horizontal fov I get 139.67mm for the photo spacing. So if I take the total distance for making photos 1345.184/139.67mm I get 10 because I would have to round up. This is wrong of course because if I make a photo with the camera on the far side against the rail and then move it at 139.67mm intervals I end up with 11 photos, not 10. So the question is how do I calculate the distance I need to move the gantry across the linear rail so each photo is overlapping by 35% and how can I calculate how many photos I need to make across the rail? Can someone help me with this?