| K4 Lenses |
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The standard focusing lens supplied with all OPTI Solar projectors is a photographic quality, triple element fully coated 85mm f2.8 42.5mm diameter plastic barrel with a helical focusing groove. All OPTI Solar lenses are fitted with a ‘click clack’ reduction collar on the front to which front of lens accessories are attached. The reduction collar can be replaced by the Zoom Attachment. Lens selection is important because the lens affects size of the projected image. 
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