ZOOM ATTATCHMENT - SOLAR 250 or 100C

Zoom Attachment [FG6120]
for use with Solar 250 or 100C Projectors

Used with either the 60mm, 85mm (standard) or 100mm Solar lens, the Zoom Attachment varies the focal length by a factor of 0.8 to 1.3.

Lens Angles

The focal length of a lens determines how wide an angle the image is projected. In simple terms the larger the number of the focal length of the lens the narrower the beam. The lower the number the wider the angle. This angle is called the 'inclusive' angle. The 'inclusive angle' of each lens can be plotted on design drawings to determine the projected image size.

Lens Selection Calculations

This simple graph shows approximate image sizes at various projection distances for all of the lenses in the OPTI range.