- developed from our 594 `See Through´ the `Clearview´ has a wider tunnel (30 mm) for viewing wind flags
- the clear-view panel can be overlayed with colour filters available in yellow, green, light and dark grey - 518-U
- on the front of the clear-view panel (see illustration) is an exceptionally slim iris adjustable from 0.8 - 2.4 mm (with 30 year guarantee) - threaded on the front to also allow colour filters in yellow, green, orange and blue - 518-F
- the glass plate and iris are easily removed for cleaning
- a slim anti-glare or polariser tube can be purchased separately and attaches to the front of the iris to give weather protection - 518-559, 518-FPO
- 518-AB + 518-ABN eyeshields are designed specifically to fit this rearsight
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