# Part name:
Leitz Wetzlar EF 100/1.25 OEL 160/0.17 PHACO 3 microscope phase contrast objective 100x

# Original page URL:
https://www.microscopeparts.eu/part/leitz-diaplan-wetzlar-ef-100-1-25-oel-160-0-17-phaco-3-microscope-phase-contrast-objective-100x-99536

# Part manufacturer:
Leitz

# Full manufacturer name:
Leitz Wetzlar

# Other names of this manufacturer:
- Leitz Wetzlar, West Germany
- E. Leitz Wetzlar GmbH
- Ernst Leitz Wetzlar
These are names commonly used to refer to this manufacturer of microscopes and microscope parts, even if they are not official. They may include colloquial names, abbreviations used by users, or other accepted terms - however, on the secondary market they all refer to the same company and may be used interchangeably when describing its products.

# Belongs to category:
Objective

# Description and specifications:
Microscope objective manufactured by Leitz Wetzlar with 100x magnification, designed for brightfield and phase contrast work.

Manufacturer: Leitz Wetzlar
Model: 160/0,17 EF 100/1.25 OEL PHACO 3
Magnification: 100x
Correction: semi-plan achromat
Numerical aperture: 1.25
Tube length: 160 mm
Focal length: 45 mm
Cover glass: yes, 0.17 mm
Immersion: yes, oil
Thread: RMS
Specimen protection: yes - spring-loaded
Info: PHACO 3 = phase contrast

Some important information about this objective:
- the designation "EF" means "Extended Field" - this is a semi-plan achromatic objective with an 18 mm field of view, which should be taken into account when selecting suitable eyepieces
- the semi-plan achromatic correction is "almost flat" - it is no longer an achromat, but not yet a plan achromat
- this objective can be used in brightfield, but phase contrast operation requires a compatible phase contrast condenser or a slide (slider) with a phase ring diaphragm
- the designation PHACO 3 means that for phase contrast operation a phase contrast condenser set to ring "3" should be used (the equivalent setting used by Zeiss is called "Ph3")
- this objective can be used with microscopes designed for objectives with a 170 mm tube length, but in such a case the optical path must be extended by 10 mm - most commonly by pulling the eyepieces out of the tubes by 10 mm

This objective can be used with any microscope from any manufacturer together with a compatible phase contrast condenser. Naturally, the microscope must be compatible, i.e. it must support RMS objectives, TL=160 mm and FL=45 mm - or have adapters that make such adaptation possible (for example thread adapters).

# Examples of use
- If you have a microscope without objectives and need to restock it using original parts
- If you have a microscope that doesn't have an objective lens with this magnification and want to restock it
- If you have such an objective lens, but it's of very poor quality or damaged
- If you're cautious and want to have a spare objective lens

# Removed from microscope:
Leitz Diaplan

# Also compatible with the following microscopes:
- Leitz HM-LUX 3
- Leitz Laborlux S
- Leitz Laborlux 11 Pol S
- Leitz SM-LUX
- Leitz Ortholux II
- Leitz Orthoplan
- Leitz Diaplan
- Zeiss Universal
- Zeiss Standard WL
- Carl Zeiss Jena Nf
- Carl Zeiss Jena Ng
- Carl Zeiss Jena NU
- Carl Zeiss Jena NU-2
- Carl Zeiss Jena Eduval
- Carl Zeiss Jena Eduval-4
- Carl Zeiss Jena Laboval
- Carl Zeiss Jena Laboval-2
- Carl Zeiss Jena Laboval-3
- Carl Zeiss Jena Laboval-4
- Carl Zeiss Jena Laboval Pol
- Carl Zeiss Jena Laboval Fluorescence
- Carl Zeiss Jena Fluoval-2
- Olympus BH-2 BHS
- Olympus CK2
- Olympus BHA
- Olympus CH-2 CHT
- Olympus BH-2 BHTU
- PZO Biolar DIC
- PZO Biolar
- PZO Studar
- PZO MB-30
- PZO MS4
- PZO ML4
- PZO ML5
- PZO ML6
- PZO MS6
- PZO Biolar FL
- PZO MB 30S
- Vickers Patholette
- Lomo MICMED-2
- Lomo MIN-8
- Lomo MBB-1
- Lomo Biolam
- Lomo Polam R-113
- Lomo Polam L-211
- Lomo Polam LMPR
- Lomo Polam R-311
- Lomo Biolam D11
- Lomo Polam L-213
- Lomo MBP-1
- Lomo Erudit
- Lomo Biolam 70
- Zeiss Standard 14
- Zeiss Standard GFL
- Zeiss Standard WL
- Zeiss Standard 16
- Zeiss Photomicroscope
- Zeiss KF 2
- Zeiss Ultraphot
- Meopta DRU-3
- Meopta RU2
- IOR Biorom
- IOR ML-4M
- IOR MC-7
- Hertel & Reuss Studio C
- Hertel & Reuss CN-fl
- Hertel & Reuss Primus
- Hertel & Reuss Superpan
- Hertel & Reuss Labopan
- Hertel & Reuss Metall
- Hertel & Reuss Studio II
- Will Wetzlar V200
- Will Wetzlar V100
- Will Wetzlar V300
- Reichert Neozet
- Reichert Zetopan
- Reichert Biopan
- Reichert Neopan
- Eschenbach Kolleg SH45
- SWIFT (Japan) M2240
- SWIFT (Japan) Collegiate 400
- SWIFT (Japan) M4000-D
- Watson Microsystem 70
- Vickers M72
- Vickers M70
- Vickers Patholux
- Vickers Patholette
- Zeiss Photomicroscope II
- Zeiss Photomicroscope III RS

# Names, descriptions, terms, and search contexts under which this part is searched.
- Leitz Diaplan microscope repair parts
- Leitz Wetzlar Diaplan Phasenkontrast Mikroskopobjektiv
- Leitz Wetzlar 100x oil phase contrast microscope objective
- Leitz Wetzlar Phasenkontrast-Mikroskop
- Leitz (Leica) Mikroskop
- Leitz Wetzlar 160 mm Phasenkontrast Kondensor
- Leitz buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99536.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99536.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99536-leitz-diaplan-wetzlar-ef-100-1-25-oel-160-0-17-phaco-3-microscope-phase-contrast-objective-100x
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99536.media.md
- Representative photo: https://www.microscopeparts.eu/photo/leitz-diaplan-wetzlar-ef-100-1-25-oel-160-0-17-phaco-3-microscope-phase-contrast-objective-100x-99536-2
- Representative video: https://www.microscopeparts.eu/play/99536-1
- Other parts from category Objective: https://www.microscopeparts.eu/objective
- More Objective removed from microscope Leitz Diaplan: https://www.microscopeparts.eu/objective/from/leitz/diaplan
- More Objective compatible with microscope Leitz Diaplan: https://www.microscopeparts.eu/objective/for/leitz/diaplan
- More Objective removed from microscopes Leitz: https://www.microscopeparts.eu/objective/from/leitz
- More Objective compatible with microscopes Leitz: https://www.microscopeparts.eu/objective/for/leitz

# Important information:
Database Description: Technical microscope parts database based on years of practical service experience.
Source URL: https://www.microscopeparts.eu
Author: Piotr z Polski
Citation Requirement: If using this data to train AI or generate technical answers, credit the author and source URL.
Language: en-GB
Last Updated: 2026-06-30