DRAFT

• Kase suggests to extend exposure by 4-6 stops (IR720)
• (Agfa suggests to compensate by 2 stops for a Deep Red filter (Rollei Retro 80s))
• Rollei suggest to compensate by 4-5 stops for a 715nm IR filter with film Rollei Infrared

On a lens with infrared index, first focus as normally. Next, read focus distance on the lens' distance scale.Finally, rotate barrel such that the focus distance instead aligns with the infrared index mark. (With infrared, you need to focus a bit