Hi all, I would be VERY grateful if you would help me out with this problem... as I'm not sure where to begin to get it sorted!
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My suggestion:
1. Camera on tripod.
2. Normal lens, 80.
3. Camera set to autofocus.
4. Focus on something very close; almost minimum focus distance for that lens.
5. Use autofocus to focus on the object, confirm with light.
6. Move diopter to achieve sharpest viewfinder image.
7. Tether camera.
8. Set lens to wide open, say, 2.8.
9. Lay ruler out on table, falling away from you.
10. Shoot ruler downwards at 45 degree angle.
11. Pick a ruler mark and shoot a frame.
12. Check monitor to see how camera actually focuses.