• Works with objectives between 300 - 800mm focal length via adjustable lens barrel
• Fully covers 35mm full format sensors
• M57 male on objective side
• M57 female on camera side
• Back focus : 55mm

Sample configurations:

• 7108 - 7923 - 5005 - [Canon DSLR]
• 7108 - 7923 - [M49.8-STL AD] - [SBIG STL camera]

7000 may be used in place of 7923 but a 5mm adjustment is necessary (lens barrel must be pushed in 5mm)

Each index mark is optimized to cover a 35mm full format sensor. For sensors smaller than APS-C sized sensors, the lens barrel should be extended out around 1.5mm.