BX51M	BX51	BX61
Optical system		UIS optical system (infinity-corrected)
	Objectives	UIS objectives
	Eyepieces	UIS eyepieces
Microscope frame	Illumination	Reflected	Reflected/transmitted
		Built-in 12V100W light source Light preset switch LED voltage indicator	Built-in 12V100W light source   Light preset switch   LED voltage indicator   Reflected/transmitted changeover switch	External 12V100W light source   Light preset switch   LED voltage indicator   Reflected/transmitted changeover switch
	Focus	Stroke 25mm   Fine stroke per rotation 100µm   Minimum graduation 1µm   With upper limit stopper, torque adjustment for coarse handle		Motorized focusing Stroke 25mm Minimum graduation 0.01µm
	Maximum sample height	65mm (w/o spacer)	25mm (w/o spacer)
Observation tubes	Widefield (F.N. 22)	Inverted: binocular, trinocular, tilting binocular Erect: trinocular, tilting binocular
	Super widefield   (F.N. 26.5)	Inverted: trinocular Erect: trinocular, tilting binocular
Reflected light illumination	BF etc.	BX-RLA2   100W halogen (high intensity burner, fiber illuminator mountable)   BF/DF/DIC/KPO   FS, AS (with centering mechanism),   BF/DF interlocking ND filter		BX-RLAA   Motorized BF/DF changeover   Motorized AS
	Reflected fluorescence	BX-URA2   100W mercury lamp, 75W xenon lamp   50W metal halide lamp   6position mirror unit turret (standard: WB, WG, WU+BF etc)   with FS, AS, (with centering mechanism), with shutter mechanism		BX-RFAA   Motorized 6 position turret   Built-in motorized shutter   With FS, AS
Transmitted light		-	100W halogen Abbe/long working distance condensers Built-in transmitted light filters (LBD, ND25, ND6)
Revolving nosepieces	For BF	Sextuple, centering sextuple, sextuple (motorized sextuple: optional)		Motorized sextuple, centering quintuple
	For BF/DF	Quintuple, centering quintuple, sextuple (motorized sextuple: optional)		Motorized quintuple
Stages		Coaxial left (right) handle stage:76(X)⊙52(Y)mm, with torque adjustment Large-size coaxial left (right) handle stage: 110(X)⊙105(Y)mm, with lock mechanism in Y axis