All OPTI Kinetics projectors are supplied with an 85mm focal length lens as standard.. These and alternative focal length lenses are available individually and are shown right.

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.

Barrel Size	42.5mm Ø	48.5mm Ø	52.5mm Ø	Inclusive
Focal Length	Solar 100c Solar 250	GoBoShow GoBoPro	K4	Lens Angle
25mm	-	-	FG6175	75 º
60mm	-	GS6180	FG6180	47º
45mm	FG6150	GS6190	FG6190	36º
85mm	FG6160	GS6205	FG6205	25º
100mm	FG6170	-	-	23º
120mm	-	GS6191	-	18º
150mm	-	GS6192	-	14º
85-210 Zoom	-	-	FG6200	25 - 10 º

Lens and Image Size Graph

This simple graph shows approximate image sizes at various projection distances for all of the lenses in the OPTI range. If image size is critical click calculations button (bottom right) and bear in mind that the maximum 'Object Size' (image on the gobo) is 35mm in diameter.