Nikon Nikkor T ED 720mm f/16

Nikon Nikkor-T-ED 720mm f/16 is the ED-glass extreme-telephoto LF lens at 720mm — for distant subject isolation on 4×5 + 5×7.

Key features

• Mount: Copal 1 shutter (1s to 1/400, X-sync at all speeds)
• Focal length: 720mm (effective)
• Maximum aperture: f/16 (slow — typical of extreme-tele)
• Image circle: ~318mm at f/22 — covers 4×5 with movements; covers 5×7 tightly
• Optical formula: ED-glass telephoto
• Multi-coating standard

Use case + rendering

The 720 T-ED is the niche extreme-tele for 4×5 + 5×7 — used for distant wildlife, mountain detail, architectural isolation. The slow f/16 aperture and dim ground glass make focus challenging — laser focus aid recommended. ED glass reduces fringing from chromatic aberration that worsens at extreme focal lengths.

Compatible cameras

• Cambo SC / Cambo Calumet 45NX — extended bellows + heavy-duty rail
• 8×10 view cameras with substantial bellows draw

Related lenses

• Nikon Nikkor-T-ED 600mm f/9 — brighter T-ED sibling at adjacent FL
• Nikon Nikkor-T-ED 800mm f/12 — longer T-ED sibling