create a product shot of a isolated black booklet, with 50 pages. The size of the booklet is 21 x 30 cm, and the style is saddle stitched. the booklet first page is plain black. The scene is minimal, in a isolated dark background. Display the booklet closed, on top of gray, industrial concrete. the scene has a cinematic light, captured by Canon EF 50mm f/1.8 STM Lens, magazine stylist ad.  --ar 4:5