- Combined rear-sight iris, 6-colour filter and 1.5x correcting lens system in one M9.5x1-threaded unit for target rifles
- Iris aperture continuously adjustable from 0.5mm to 3.0mm, with a locking collar to hold the V-mark position precisely
- Six optically flat glass colour filters — yellow, light green, orange, purple, dark grey and light grey — for changing range light
- 1.5x dioptre lens with -4.5 to +4.5 correction, set to the shooter's own eyesight
- Gehmann's 579 cylindrical lens system built in — axis set 0-180° and locked with three Allen screws, sphere adjusted independently, for astigmatism correction
- Matt-finished internal and external surfaces to minimise glare; laser-engraved markings for repeatable settings
- Optics unscrew and can be replaced with the 577-thread adapter for a plain iris-only setup; supplied with instruction manual
The Gehmann 570-579 combines a rear-sight iris, six-colour filter wheel and a 1.5x correcting lens with Gehmann's 579 cylindrical lens system built into one M9.5x1-threaded unit, for target rifle shooters. The iris aperture is continuously adjustable from 0.5mm to 3.0mm, with a locking collar that holds the V-mark exactly where it's set. Six optically flat glass filters — yellow, light green, orange, purple, dark grey and light grey — rotate into position to suit changing light on the range. The 1.5x dioptre lens gives -4.5 to +4.5 correction, so the sight can be set to the shooter's own eyesight rather than relying on separate spectacles. Built into the same unit is Gehmann's cylindrical lens system, which corrects astigmatism: axis is set against markings from 0-180° and locked with three Allen screws, while sphere is adjusted independently. All external and internal surfaces carry a matt finish to minimise glare, with laser-engraved markings for repeatable settings. The optics unscrew from the iris body, so the 577-thread adapter can be fitted in their place for a plain iris-only setup. Supplied with Gehmann's instruction manual.
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