Unitron Z645 Front Auxiliary Lenses are used to increase or decrease magnification and zoom range

0.3x auxiliary objective, 287mm working distance (LED and Plain Focusing stand configurations require riser adapter)

0.4x auxiliary objective, 217mm working distance (LED and Plain Focusing stand configurations require riser adapter)

0.5x auxiliary objective, 177mm working distance

Riser adapter, required for 0.3x, 0.4x, 0.5x auxiliary objectives

0.75x auxiliary objective, 120mm working distance

1.5x auxiliary objective, 47mm working distance

2.0x auxiliary objective, 26mm working distance

1x glass lens shield (removable), 110mm working distance

 

Objective Lens	Working Distance (mm)	Eyepieces
		WF10x/22mm		WF15x/16mm		WF20x/12.5mm
		Mag.	F.O.V. (mm)	Mag.	F.O.V. (mm)	Mag.	F.O.V. (mm)
1x	110	6.7x - 45x	32.8 - 4.8	10.1x - 67.5x	23.8 - 3.5	13.4x - 90x	18.6 - 2.7
0.3x	287	2x - 13.5x	109.3 - 16	3x - 20.3x	79.3 - 11.6	4x - 27x	62 - 9
0.5x	177	3.4x - 22.5x	65.6 - 9.7	5.1x - 33.8x	47.7 - 7.1	6.8x - 45x	37.3 - 5.5
0.75x	120	5x - 33.8x	43.7 - 6.5	7.5x - 50.7x	31.8 - 4.7	10x - 67.6x	24.8 - 3.7
1.5x	47	10.1x - 67.5x	21.8 - 3.2	15.2x - 101.3x	15.9 - 2.3	202.2x - 135x	12.4 - 1.8
2.0x	26	13.4x - 90x	16.4 - 2.4	20.1x - 135x	11.9 - 1.7	26.8x - 180x	9.3 - 1.3