Microscope Objective

Olympus M5 M10 M20 M40 Objective for Microscope in one Deal
Olympus M5 M10 M20 M40 Objective for Microscope in one Deal
$137.50 (6 Bids)
Time Remaining: 35m

Microscope Objective Par Focal Rings Set of 10
Microscope Objective Par Focal Rings Set of 10
$16.00
Time Remaining: 7d 23h 25m
Buy It Now for only: $16.00

Carl Zeiss Kpl 10x 10x 20 Wide W 0cular eyepiece microscope objective PAIR
Carl Zeiss Kpl 10x 10x 20 Wide W 0cular eyepiece microscope objective PAIR
$129.99 (1 Bid)
Time Remaining: 5h 40m

New 4X Plan Achromatic Microscope Objective Lens
New 4X Plan Achromatic Microscope Objective Lens
$23.99
Time Remaining: 8d 9h 38m
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American Optical flip top 4x 32mm 10x 16mm conversion lens microscope objective
American Optical flip top 4x 32mm 10x 16mm conversion lens microscope objective
$34.99 (1 Bid)
Time Remaining: 6h 42m

Wild Heerbrugg 15x K 15xK Wide W 0cular eyepiece microscope objective PAIR
Wild Heerbrugg 15x K 15xK Wide W 0cular eyepiece microscope objective PAIR
$149.99
Time Remaining: 5h 47m
Buy It Now for only: $174.99

100x Microscope Oil Objective BL Bausch  Lomb NEW
100x Microscope Oil Objective BL Bausch Lomb NEW
$11.99
Time Remaining: 13d 23h 19m
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Microscope Objectives Nikon CF ELWD 40x 055 160 12 WD 36 28mm DL Ph3
Microscope Objectives Nikon CF ELWD 40x 055 160 12 WD 36 28mm DL Ph3
$650.00
Time Remaining: 33m
Buy It Now for only: $750.00

Microscope Objectives Zeiss Plan 40x 060 160 11 15 Ph2
Microscope Objectives Zeiss Plan 40x 060 160 11 15 Ph2
$160.00
Time Remaining: 31m
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Microscope Objective Par Focal Rings Set of 14
Microscope Objective Par Focal Rings Set of 14
$22.95
Time Remaining: 29d 8h 39m
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Microscope Objectives American Optic Plan Epi 10x 25 Infinity
Microscope Objectives American Optic Plan Epi 10x 25 Infinity
$150.00
Time Remaining: 47m
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15X BARLOW AUX OBJECTIVE LENS FOR STEREO MICROSCOPE
15X BARLOW AUX OBJECTIVE LENS FOR STEREO MICROSCOPE
$49.95
Time Remaining: 6d 8h 36m
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Microscope Objectives Nikon LWD 40x 055 DL WD 36 28mm Ph3
Microscope Objectives Nikon LWD 40x 055 DL WD 36 28mm Ph3
$350.00
Time Remaining: 33m
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Microscope Objectives Zeiss Plan Apo 63x 14 Oil WD 021mm Sprg
Microscope Objectives Zeiss Plan Apo 63x 14 Oil WD 021mm Sprg
$1,100.00
Time Remaining: 37m
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05X BARLOW AUX OBJECTIVE LENS FOR STEREO MICROSCOPE
05X BARLOW AUX OBJECTIVE LENS FOR STEREO MICROSCOPE
$49.98
Time Remaining: 6d 8h 30m
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Microscope Objectives American Optic Plan Epi 65x 15 Infinity
Microscope Objectives American Optic Plan Epi 65x 15 Infinity
$150.00
Time Remaining: 46m
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Carl Zeiss Neofluar Ph2 16x 16 040 160 microscope objective Phase contrast
Carl Zeiss Neofluar Ph2 16x 16 040 160 microscope objective Phase contrast
$164.99
Time Remaining: 3h 41m
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LOT OF 8 Microscope Objectives 40 065 10 25 4 1
LOT OF 8 Microscope Objectives 40 065 10 25 4 1
$79.99
Time Remaining: 21d 9h 4m
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Microscope Objectives Nikon CFI Plan Apo 60x 12 VC Infinity 15 18 WD 27mm
Microscope Objectives Nikon CFI Plan Apo 60x 12 VC Infinity 15 18 WD 27mm
$6,780.00
Time Remaining: 44m
Buy It Now for only: $7,458.00

Microscope Objective Lens Adjustable Extension Adapter
Microscope Objective Lens Adjustable Extension Adapter
$18.00
Time Remaining: 15d 10h 5m
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Microscope Objectives Nikon Plan Apo 100x 125 Oil 160 0
Microscope Objectives Nikon Plan Apo 100x 125 Oil 160 0
$300.00
Time Remaining: 37m
Buy It Now for only: $400.00

Microscope Objectives Nikon CF ELWD 20x 040WD 82 69mm DL Ph2
Microscope Objectives Nikon CF ELWD 20x 040WD 82 69mm DL Ph2
$490.00
Time Remaining: 32m
Buy It Now for only: $650.00

4X PLAN ACHROMATIC MICROSCOPE OBJECTIVE LENS
4X PLAN ACHROMATIC MICROSCOPE OBJECTIVE LENS
$24.98
Time Remaining: 8h 5m
Buy It Now for only: $24.98

Microscope Objectives Reichert Plan 10x 025 Infinity P
Microscope Objectives Reichert Plan 10x 025 Infinity P
$20.00
Time Remaining: 30m

Microscope Objectives Nikon CFI Plan Apo 60x 149 Oil TIRF WD 012mm
Microscope Objectives Nikon CFI Plan Apo 60x 149 Oil TIRF WD 012mm
$8,020.00
Time Remaining: 43m
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Microscope Objective Stage Micrometer Calibration Slide
Microscope Objective Stage Micrometer Calibration Slide
$21.00
Time Remaining: 24d 9h 6m
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Microscope Objectives Nikon S Plan Fluor ELWD 40xC 060 ADM WD 36 28mm Ph2
Microscope Objectives Nikon S Plan Fluor ELWD 40xC 060 ADM WD 36 28mm Ph2
$1,602.00
Time Remaining: 40m
Buy It Now for only: $1,763.00

Microscope Objectives Nikon CFI Plan Apo Lambda S 60x 140 DIC N2
Microscope Objectives Nikon CFI Plan Apo Lambda S 60x 140 DIC N2
$5,621.00
Time Remaining: 42m
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RMS microscope objective to M42 camera adapter LOMO Zeiss new
RMS microscope objective to M42 camera adapter LOMO Zeiss new
$19.00
Time Remaining: 4d 1h 25m
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Microscope Objectives Nikon CFI Plan Fluor 40x 130 Oil DIC H N2 WD 02mm
Microscope Objectives Nikon CFI Plan Fluor 40x 130 Oil DIC H N2 WD 02mm
$7,730.00
Time Remaining: 41m
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60X ACHROMATIC MICROSCOPE OBJECTIVE LENS NEW
60X ACHROMATIC MICROSCOPE OBJECTIVE LENS NEW
$59.98
Time Remaining: 29d 15h 33m
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Microscope Objectives Nikon CFI Plan Apo 40x 095 Infinity 011 023 DIC M
Microscope Objectives Nikon CFI Plan Apo 40x 095 Infinity 011 023 DIC M
$2,413.00
Time Remaining: 40m
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Microscope Objectives Nikon Plan 10x 025 DIN
Microscope Objectives Nikon Plan 10x 025 DIN
$220.00
Time Remaining: 31m
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NEW RP Series DIN 100X NA 125 INF 017 Oil Objective Plan Achro Lens Microscope
NEW RP Series DIN 100X NA 125 INF 017 Oil Objective Plan Achro Lens Microscope
$99.00
Time Remaining: 29d 5h 7m
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Microscope Objectives Nikon Plan Fluor 40x 075 DIC M WD 072mm
Microscope Objectives Nikon Plan Fluor 40x 075 DIC M WD 072mm
$750.00
Time Remaining: 39m
Buy It Now for only: $825.00

Microscope Objectives Nikon CFI Plan Apo 100x 149 Oil TIRF
Microscope Objectives Nikon CFI Plan Apo 100x 149 Oil TIRF
$7,682.00
Time Remaining: 45m
Buy It Now for only: $8,451.00

New LPL 25X 007 Plan Achromatic Microscope Objective Lens
New LPL 25X 007 Plan Achromatic Microscope Objective Lens
$49.99
Time Remaining: 28d 20h 58m
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NIKON M PLAN 25X 0075 210 0 MICROSCOPE OBJECTIVE
NIKON M PLAN 25X 0075 210 0 MICROSCOPE OBJECTIVE
$177.50 (4 Bids)
Time Remaining: 9h 8m
Buy It Now for only: $500.00

DIN 20X 160 017 Plan Achromatic Objective 4 Microscope
DIN 20X 160 017 Plan Achromatic Objective 4 Microscope
$49.99
Time Remaining: 4d 1h 28m
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Microscope Objectives Nikon CFI Plan Apo 60x 140 Oil Infinity 017
Microscope Objectives Nikon CFI Plan Apo 60x 140 Oil Infinity 017
$4,904.00
Time Remaining: 41m
Buy It Now for only: $5,395.00

Microscope Objectives Nikon CFI Plan 40x 065 Infinity 017 WD 057mm
Microscope Objectives Nikon CFI Plan 40x 065 Infinity 017 WD 057mm
$330.00
Time Remaining: 39m
Buy It Now for only: $363.00

American OpticalAO 10x APOCHROMATIC microscope objectiveGood conditionRMS
American OpticalAO 10x APOCHROMATIC microscope objectiveGood conditionRMS
$49.00
Time Remaining: 27d 21m
Buy It Now for only: $49.00

Microscope Objectives Nikon CFN Plan 100x 135 Oil 160 017 NCG
Microscope Objectives Nikon CFN Plan 100x 135 Oil 160 017 NCG
$300.00
Time Remaining: 36m
Buy It Now for only: $400.00

NEW Carl Zeiss Plan 1x 1 004 160 microscope objective SUPER RARE
NEW Carl Zeiss Plan 1x 1 004 160 microscope objective SUPER RARE
$434.99
Time Remaining: 10h 13m
Buy It Now for only: $499.99

Nikon CFI Plan Fluor 10X Microscope Objective
Nikon CFI Plan Fluor 10X Microscope Objective
$449.00
Time Remaining: 21d 3h 20m
Buy It Now for only: $449.00

NIKON BD PLAN 100 080 ELWD 210 0 MICROSCOPE OBJECTIVE
NIKON BD PLAN 100 080 ELWD 210 0 MICROSCOPE OBJECTIVE
$250.00
Time Remaining: 9h 29m
Buy It Now for only: $750.00

American Optical 4x microscope objective  correctedGood conditionRMS
American Optical 4x microscope objective correctedGood conditionRMS
$25.00
Time Remaining: 27d 30m
Buy It Now for only: $25.00

NIKON CF PLAN 25X 0075 EPI MICROSCOPE OBJECTIVE
NIKON CF PLAN 25X 0075 EPI MICROSCOPE OBJECTIVE
$250.00
Time Remaining: 8h 53m
Buy It Now for only: $750.00

Microscope Objectives Nikon CFI Plan Achromat 100x 125 Oil WD 023
Microscope Objectives Nikon CFI Plan Achromat 100x 125 Oil WD 023
$530.00
Time Remaining: 45m
Buy It Now for only: $583.00

Lots of Assorted Microscope Objectives AS IS
Lots of Assorted Microscope Objectives AS IS
$60.00
Time Remaining: 25d 5h 25m
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NIKON BD PLAN 20 04 210 0 MICROSCOPE OBJECTIVE
NIKON BD PLAN 20 04 210 0 MICROSCOPE OBJECTIVE
$150.00
Time Remaining: 9h 57m
Buy It Now for only: $500.00

Carl Zeiss Neofluar Ph2 40x 40 075 160 017 microscope objective Phase contrast
Carl Zeiss Neofluar Ph2 40x 40 075 160 017 microscope objective Phase contrast
$199.99
Time Remaining: 3h 30m
Buy It Now for only: $249.99

ADAPTER of DIN RMS microscope objective to M26x075 Nikon BD etc brand new
ADAPTER of DIN RMS microscope objective to M26x075 Nikon BD etc brand new
$24.00
Time Remaining: 26d 1h 37m
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Leitz Wetzlar microscope 5 objective lens nosepiece turret slider filter RARE
Leitz Wetzlar microscope 5 objective lens nosepiece turret slider filter RARE
$284.99
Time Remaining: 7h 20m
Buy It Now for only: $349.99

NIKON BD PLAN 40 065 210 0 MICROSCOPE OBJECTIVE
NIKON BD PLAN 40 065 210 0 MICROSCOPE OBJECTIVE
$100.00
Time Remaining: 9h 40m
Buy It Now for only: $250.00

KIT OF 4 INDUSTRIAL or small comparator MICROSCOPE OBJECTIVES 23mm thread
KIT OF 4 INDUSTRIAL or small comparator MICROSCOPE OBJECTIVES 23mm thread
$135.00
Time Remaining: 19d 22h 50m
Buy It Now for only: $135.00

Ernst Leitz Wetzlar GmbH Periplan 10x 0cular eyepiece microscope objective
Ernst Leitz Wetzlar GmbH Periplan 10x 0cular eyepiece microscope objective
$49.99
Time Remaining: 3h 34m
Buy It Now for only: $64.99

NIKON Model  Stereo Microscope 2X Head with 10X NIKON objectives
NIKON Model Stereo Microscope 2X Head with 10X NIKON objectives
$119.00
Time Remaining: 3d 13m
Buy It Now for only: $119.00

Ernst Leitz Wetzlar Periplan Ok 10x 0cular eyepiece microscope objective
Ernst Leitz Wetzlar Periplan Ok 10x 0cular eyepiece microscope objective
$124.99
Time Remaining: 3h 36m
Buy It Now for only: $149.99

Olympus microscope objective lens 40x LWD CD Plan 40 PL 055 160 0 2
Olympus microscope objective lens 40x LWD CD Plan 40 PL 055 160 0 2
$56.88 (4 Bids)
Time Remaining: 4d 12h 17m

Olympus LUCPlanFLN 20X Objective Microscope Lens LUCPlanFLN20x
Olympus LUCPlanFLN 20X Objective Microscope Lens LUCPlanFLN20x
$499.95
Time Remaining: 29d 6h 41m
Buy It Now for only: $499.95

Nikon CFI Plan Fluor 40X Objective
Nikon CFI Plan Fluor 40X Objective
$450.00
Time Remaining: 6h 17m

Carl Zeiss Phako Phaco Phase contrast 0cular eyepiece microscope objective
Carl Zeiss Phako Phaco Phase contrast 0cular eyepiece microscope objective
$149.99
Time Remaining: 6h 12m
Buy It Now for only: $199.99

VISTEC PL FL 100x 075 Microscope Objective
VISTEC PL FL 100x 075 Microscope Objective
$950.00
Time Remaining: 15d 22h
Buy It Now for only: $950.00

Wild Heerbrugg 10x K 10xK Wide W 0cular eyepiece microscope objective
Wild Heerbrugg 10x K 10xK Wide W 0cular eyepiece microscope objective
$49.99
Time Remaining: 3h 39m
Buy It Now for only: $64.99

AO American Optical Reichert Microscope PLAN ACHRO 40X Objective Lens 40 66
AO American Optical Reichert Microscope PLAN ACHRO 40X Objective Lens 40 66
$29.88
Time Remaining: 15d 17m
Buy It Now for only: $29.88

Ernst Leitz Wetzlar GmbH Periplan Ok 10x 0cular eyepiece microscope objective
Ernst Leitz Wetzlar GmbH Periplan Ok 10x 0cular eyepiece microscope objective
$124.99
Time Remaining: 3h 54m
Buy It Now for only: $149.99

Olympus GWH 10x 23 Pair of 0cular eyepiece microscope objective
Olympus GWH 10x 23 Pair of 0cular eyepiece microscope objective
$174.99
Time Remaining: 4h
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Leitz NPL Microscope Objective 20x
Leitz NPL Microscope Objective 20x
$260.00
Time Remaining: 29d 3h 40m
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New 10X 025 160 017 Plan Achromatic Objective For Microscope with Storage Case
New 10X 025 160 017 Plan Achromatic Objective For Microscope with Storage Case
$54.90
Time Remaining: 4h 36m
Buy It Now for only: $61.00

Olympus SPlan Apo 20x 070 Microscope Objective Lens BH
Olympus SPlan Apo 20x 070 Microscope Objective Lens BH
$599.00
Time Remaining: 4d 8h 32m

Leica Wild PLANAPO microscope objective 063x part  10472649 minty  RARE
Leica Wild PLANAPO microscope objective 063x part 10472649 minty RARE
$1,179.94
Time Remaining: 9d 4h 29m
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Olympus SPlan Apo 40x 095 Air Microscope Objective Lens BH
Olympus SPlan Apo 40x 095 Air Microscope Objective Lens BH
$599.00 (1 Bid)
Time Remaining: 4d 9h 42m

NEW 4X 01 INFINITY PLAN ACHROMATIC MICROSCOPE OBJECTIVE LENS
NEW 4X 01 INFINITY PLAN ACHROMATIC MICROSCOPE OBJECTIVE LENS
$49.00
Time Remaining: 20d 10h 51m
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Leitz Microscope Objective 16 mm APO A030
Leitz Microscope Objective 16 mm APO A030
$29.00
Time Remaining: 2d 22h 36m

Carl Zeiss 10x 10 022 160 microscope objective
Carl Zeiss 10x 10 022 160 microscope objective
$34.99
Time Remaining: 6h 39m
Buy It Now for only: $49.99

Brand New 4X Plan Achromatic Objective DIN Lens For Biological Microscope
Brand New 4X Plan Achromatic Objective DIN Lens For Biological Microscope
$23.99
Time Remaining: 4d 9h 31m
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Carl Zeiss Kpl 10x 0cular eyepiece microscope objective PAIR
Carl Zeiss Kpl 10x 0cular eyepiece microscope objective PAIR
$64.99
Time Remaining: 6h 16m
Buy It Now for only: $79.99

Rare Carl Zeiss Planapo 63X 140 NA 160  Oel Microscope Objective
Rare Carl Zeiss Planapo 63X 140 NA 160 Oel Microscope Objective
$199.99 (1 Bid)
Time Remaining: 5d 21h 36m

AO RARE 50x OIL 1mm WD microscope objective  correctedGood conditionRMS
AO RARE 50x OIL 1mm WD microscope objective correctedGood conditionRMS
$45.00
Time Remaining: 27d 39m
Buy It Now for only: $45.00

2x Objective Barlow Lens for Stereo Microscope D50mm
2x Objective Barlow Lens for Stereo Microscope D50mm
$69.90
Time Remaining: 7h 36m
Buy It Now for only: $78.00

Carl Zeiss Plan 16X 035 NA 160 017 Microscope Objective
Carl Zeiss Plan 16X 035 NA 160 017 Microscope Objective
$24.99
Time Remaining: 5d 21h 36m

LOMO Microscope Objective APO WI 70x123 Luminescence Fluorescence as is
LOMO Microscope Objective APO WI 70x123 Luminescence Fluorescence as is
$99.00
Time Remaining: 22d 29m
Buy It Now for only: $99.00

Nikon M Plan 40 x Microscope Objective
Nikon M Plan 40 x Microscope Objective
$99.95
Time Remaining: 1d 7h 41m

LEICA MICROSCOPE OBJECTIVE HC PLAN FLUOTAR 20X FOR BF AND NOMARSKI DIC
LEICA MICROSCOPE OBJECTIVE HC PLAN FLUOTAR 20X FOR BF AND NOMARSKI DIC
$240.00
Time Remaining: 5d 4h 47m
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DIN 40X 160 017 Plan Achromatic Objective for Compound Microscope with Case
DIN 40X 160 017 Plan Achromatic Objective for Compound Microscope with Case
$89.90
Time Remaining: 5h 46m
Buy It Now for only: $100.00

Leitz Wetzlar 10x 10xM Periplan M Mess 0cular eyepiece microscope objective PAIR
Leitz Wetzlar 10x 10xM Periplan M Mess 0cular eyepiece microscope objective PAIR
$149.99
Time Remaining: 6h 14m
Buy It Now for only: $174.99

CARL ZEISS MICROSCOPE APOCHROMAT OBJECTIVE 20 x 065
CARL ZEISS MICROSCOPE APOCHROMAT OBJECTIVE 20 x 065
$95.00
Time Remaining: 29d 16h 27m
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Turret Phase Contrast Condenser with Plan Objectives for Compound Microscope
Turret Phase Contrast Condenser with Plan Objectives for Compound Microscope
$679.90
Time Remaining: 1d 1h 36m
Buy It Now for only: $755.00

Nikon CFW 10x Pair of 0cular eyepiece microscope objective
Nikon CFW 10x Pair of 0cular eyepiece microscope objective
$149.99
Time Remaining: 5h 28m
Buy It Now for only: $174.99

Filter set microscope objective 10x 20x 40x 100x 4x rheinberg phase plan apo
Filter set microscope objective 10x 20x 40x 100x 4x rheinberg phase plan apo
$129.99
Time Remaining: 9d 23h 59m
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Leica Opthalmic Microscope Objective Lens 175mm
Leica Opthalmic Microscope Objective Lens 175mm
$100.00
Time Remaining: 2d 1h 36m
Buy It Now for only: $199.00

Brand New RMS Thread to M42 Adapter for microscope objective flat
Brand New RMS Thread to M42 Adapter for microscope objective flat
$15.00
Time Remaining: 18d 10h 26m
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Olympus ULWD M S Plan 20 ULWDMSPlan20 20x 040na Microscope Objective
Olympus ULWD M S Plan 20 ULWDMSPlan20 20x 040na Microscope Objective
$399.95
Time Remaining: 7h 3m

New Dual Light Stereo Microscope 1X 4X Objectives 10X Eyepieces
New Dual Light Stereo Microscope 1X 4X Objectives 10X Eyepieces
$90.00
Time Remaining: 1h 26m

New DIN 4X Microscope Achromatic Objective Lens
New DIN 4X Microscope Achromatic Objective Lens
$19.99
Time Remaining: 12d 23h 29m
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American Optical AO 10x WF 0cular eyepiece microscope objective 176A
American Optical AO 10x WF 0cular eyepiece microscope objective 176A
$39.99
Time Remaining: 5h 35m
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Leitz Wetzlar NPL FLUOTAR 25 055 160 017 PHACO 2 Objective for Microscope
Leitz Wetzlar NPL FLUOTAR 25 055 160 017 PHACO 2 Objective for Microscope
$175.00 (2 Bids)
Time Remaining: 6d 2h 20m

MICROSCOPE 6 PLACE OBJECTIVE TURRET
MICROSCOPE 6 PLACE OBJECTIVE TURRET
$99.00
Time Remaining: 3d 7h 6m
Buy It Now for only: $99.00

Carl Zeiss Neofluar 63 090 Microscope objective
Carl Zeiss Neofluar 63 090 Microscope objective
$400.00
Time Remaining: 11h 7m

Microscope Objective
Microscope Objective

Acknowledging the History of Microscopes

The word microscope derives from the Greek, namely the word micron = small and scopos = purpose. Overall, it is a tool used to view objects that are too small to be seen by the naked eye.

It is known that the makers of the microscope for the first time were two German scientists, namely Hans Janssen and Zacharias Janssen (father-son) in 1590. This finding encouraged other scientists, including Galileo Galilei ( Italy ), to make the same tool. Galileo completed it in the year 1609, and his microscope was known by the name Galileo.

This type of microscope used optical lenses, so it was called optical microscope. Indeed, microscopes that were assembled from optical lenses had limited ability in growing the size of the object. This was caused by light diffraction limit that was determined by the wavelength of light. Theoretically, the wavelength of light was only up to about 200 nanometers. Therefore, this optical lens-based microscope could not observe the size below 200 nanometers.

To see the object size less than 200 nanometers, you needed a microscope with a short wavelength. From this idea, in 1932, there was an electron microscope. As the name implied, it used electron beam which had the wavelength shorter than light. Therefore, it had a zoom capability of an object (resolution) that was higher than the optical microscope.

Actually, in the magnification function of the object, the electron microscope also used lenses, but not from the type of glass as you could see in the optical microscope, but it was from the kind of magnets. The nature of this magnetic field could control and influence the electrons that passed through it, so it could serve to replace the lens on the optical microscope.

Another particularity of this electron microscope was the observation of the object in a vacuum condition. This was done because the electron beam would be obstructed if it grinded the flow of molecules that existed in normal air. By making the space of object observation in vacuum condition, the electron-molecule collisions could be avoided.

About the Author

Microscope for sale is available for you to give further information about microscope. The information include types of microscopes, microscope accessories, microscope lens, microscope stand, and many more. The microscope stand itself functions to support the body tube and sub-stage assembly, as well as the specimen.

What kind of microscope uses 2 lens called the ocular and objective lens?

The choices are simple microscope, compound microscope, and stereomicroscope.

Optical light microscope (or stereomicroscope)

Dry objective and oil immersion objective use in microscope