Certain photographic applications need an extremely differentiated scale focusing - e.g. when using a laser distance meter. ALPA offers with the ALPA HPF rings a unique and retrofittable solution for these requirements which is - in contrast to other offerings - truly usable in freehand operation which can be used also in the field without complicated translation work. The rings are available in easy to read and comprehensible meter and feet scales. 

Every scale features engraved distance readings from infinity, the first five degrees and then consecutively every five degree up to 270 degrees. The single degrees in between are clearly marked. If you need the full resolution you can download the detailed distance tables for the lenses. The table also offers the corresponding metering when using the ALPA macro adapters.

For an even better handling we added the removable focusing knobs to every HPF ring.

Available HPF rings for Rodenstock lenses

• Rodenstock HR Digaron-S 5.6/23 mm = RDS 23
• Rodenstock HR Digaron-S 5.6/28 mm = RDS 28
• Rodenstock HR Digaron-W 4.0/32 mm = RDW 32
• Rodenstock HR Digaron-S 4.0/35 mm = RDS 35
• Rodenstock HR Digaron-W 4.0/40 mm = RDW 40
• Rodenstock HR Digaron-W 4.0/50 mm = RDW 50
• Rodenstock HR Digaron-S 4.0/60 mm = RDS 60
• Rodenstock HR Digaron-W 5.6/70 mm = RDW 70
• Rodenstock HR Digaron-W 5.6/90 mm = RDW 90
• Rodenstock HR Digaron-S 4.0/100 mm = RDS 100
• Rodenstock HR Digaron-S 5.6/180 mm = RDS 180

Detailed distance tables (meter/feet)

Instruction video - How to mount the HPF rings