|   | BX61 | BX51 | BX51M | BX41M | BX41M-ESD | 
                                            | Optical system | UIS optical system (infinity-corrected) | 
                                            | Objectives | UIS eyepieces | 
                                            | Eyepieces | 
                                            | Microscopeframe
 | Illumination | Reflected / transmitted | Reflected | Reflected (ESD treatment) | 
                                            | External 12V100W light source | Built-in 12V100Wlight source
 | Built-in 12V100W light source | Built-in 6V30W light source | 
                                            | Light preset switch | 
                                            | LED voltage indicator | - | 
                                            | Reflected / transmitted changeover switch | - | 
                                            | Focus | Motorized focusing | Stroke 25mm | 
                                            | Stroke 25mm | Fine stroke per rotation 100µm | 
                                            | Minimum graduation 0.01µm | Minimum graduation 1µm | 
                                            | - | With upper limit stopper, torque adjustment forcoarse handle
 | 
                                            | Maximum sampleheight
 | 25mm (w / o spacer)  | 65mm (w / o spacer) | 
                                            | Observation tubes
 | Widefield(F.N. 22)
 | Inverted image: binocular, trinocular, tilting binocularErect image: trinocular, tilting binocular
 | 
                                            | Super widefield(F.N. 26.5)
 | Inverted image: trinocularErect image: trinocular, tilting trinocular
 | 
                                            | Reflected light illumination | Reflected BF/DIC/KPOor
 BF / DF /
 DIC / KPO
 | BX-RLAA | BX-RLA2 | BX-KMA | BX-KMA-ESD | 
                                            | Motorized BF / DF changeoverMotorized AS
 | 100W halogen(high intensity burner, fiber illuminator mountable)
 BF / DF / DIC / KPO
 FS, AS (with centering mechanism), BF/DF interlocking ND filter
 | 30W halogen
 BF / DIC /
 KPO
 | 30W halogen
 BF / DIC /
 KPO
 ESD treatment applied
 | 
                                            | Reflected fluorescence | BX-RFAA | BX-URA2 | - | 
                                            | Motorized 6 position turretBuilt-in motorized shutter
 With FS, AS
 | 100W mercury lamp, 75W xenon lamp50W metal halide lamp
 6 position mirror unit turret (standard: WB, WG, WU+BF etc)
 with FS, AS (with centering mechanism), with shutter mechanism
 | 
                                            | Transmitted light | 100W halogen | - | 
                                            | Abbe / long working distance condensers | 
                                            | Built-in transmitted light filters (LBD, ND25, ND6) | 
                                            | Revolving nosepieces | For BF | Motorized sextuple, centering quintuple | Sextuple, centering sextuple, septuple (motorized sextuple: optional) | Sextuple BF / BF with for a hole for DIC slider | Sextuple with ESD treatment | 
                                            | For BF / DF | Motorized quintuple | Quintuple,centering quintuple, sextuple (motorized quintuple optional) | - | 
                                            | Stages | Coaxial left(right) handle stage: 76(X)x52(Y)mm, with torque adjustment | 
                                            | Large-size coaxial left (right) handle stage: 110(X)x105(Y)mm, with lock mechanism in Y axis |