# Part name:
Lomo Polam L-213 polarizing microscope СЛ1/4λ Sénarmont mica quarter-wave compensating slider | SL 1/4 lambda plate CP-QS

# Original page URL:
https://www.microscopeparts.eu/part/lomo-polam-l-213-polarizing-microscope-sl1-4-lambda-senarmont-mica-quarter-wave-compensating-slider-sl-1-4-lambda-plate-99534

# Part manufacturer:
Lomo

# Full manufacturer name:
Leningrad Optical Mechanical Association

# Other names of this manufacturer:
- LZOS
- TOMP
- WTOMP
- WOOMP
- GOMZ
- LOOMP
- Progres
- Progress
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:
Sliders

# Description and specifications:
LOMO СЛ1/4λ (Latin alphabet transcription: SL1/4lambda) Quarter-wave plate - Sénarmont variant (CP-QS - Compensating Plate, Quarter-wave Sénarmont), perpendicular/parallel axis - for Lomo Polam polarizing microscopes

Lomo microscope compensating slider:
Factory marking: СЛ1/4λ (Latin alphabet transcription: SL1/4lambda)
Alternative name: Sénarmont, CP-QS (Compensating Plate, Quarter-wave Sénarmont)
Crystal material: Mica
Optical retardation: 1/4 lambda (approx. 140 nm)
Orientation of optical axes: perpendicular and parallel to the slider body edge

Dimensions:
Total length: 80 mm
Insertion length: 60 mm
Width: 19 mm
Height: 7,5 mm

Quarter-wave compensating slider of the Sénarmont type (Sénarmont quarter-wave plate) introducing a phase shift of 1/4 wavelength. Unlike the standard quarter-wave plate, in the Sénarmont configuration the crystal axis (Ng) runs parallel to the vibration direction of the polarizer, and the 45-degree effect is enforced by the microscope accessory slot - not by the orientation of the crystal within the body. Used for precise quantitative measurements of optical retardation, determination of the optical sign of minerals, and analysis of elliptically polarized light - in combination with a rotating analyzer and an interference filter (typically 546 nm or 551 nm).

The axes of the fast ray (Np) and slow ray (Ng) are oriented parallel and perpendicular to the edges of the slider body. This arrangement is used in specific types of LOMO microscope heads or with a non-standard (rotated by 45 degrees) polarizer setup, in order to achieve the correct interference effect.

A first variant of this slider is also available - standard quarter-wave plate СЛ1/4λ (Latin alphabet transcription: SL1/4lambda) with diagonal axis (45 degrees), suitable for the vast majority of classic polarizing microscopes with a standard accessory slot. Before purchasing, please check the design of your microscope. Using the incorrect variant will cause the crystal axes to misalign with the vibration direction of the polarized light, preventing proper background extinction as well as precise measurements and conoscopic observations.

# Examples of use
- If you have a polarizing microscope and you are missing this compensator on the slider
- If you have this slide, but it's damaged (e.g., delamination)
- If you want to use this quarter-wave plate for other DIY purposes

# Removed from microscope:
Lomo Polam L-213

# Also compatible with the following microscopes:
- Lomo Polam
- Lomo Polam R-113
- Lomo Polam L-211
- Lomo Polam LMPR
- Lomo Polam R-311
- Lomo Polam L-213
- Lomo Polam S-111
- Lomo Polam S-112
- Lomo Polam R-111
- Lomo Polam R-112

# Names, descriptions, terms, and search contexts under which this part is searched.
- Lomo Polam L-213 microscope repair parts
- Lomo Polam СЛ1/4λ ćwierćfalowa wsuwka kompensacyjna mika typu Sénarmont
- Lomo Polam ćwierćfalówka polaryzacyjna SL 1/4 lambda
- Lomo Polam L-213 Polarisations-Mikroskop СЛ1/4λ Sénarmont Viertelwellen Kompensations Schieber
- Lomo Polam Lambda Glimmer Viertel-Plättchen
- Lomo Polam polarizing microscope СЛ1/4λ Sénarmont mica quarter-wave compensating slider
- Lomo Polam microscope SL 1/4 lambda plate
- Lomo buy spare parts

# Related URLs:
- Markdown po polsku: https://www.serwismikroskopowy.pl/part/99534.md
- Markdown auf Deutsch: https://www.mikroskopteile.de/part/99534.md
- Gallery of all photos of this part: https://www.microscopeparts.eu/gallery/99534-lomo-polam-l-213-polarizing-microscope-sl1-4-lambda-senarmont-mica-quarter-wave-compensating-slider-sl-1-4-lambda-plate
- Media manifest of this part (photos + videos, for AI/RAG): https://www.microscopeparts.eu/part/99534.media.md
- Representative photo: https://www.microscopeparts.eu/photo/lomo-polam-l-213-polarizing-microscope-sl1-4-lambda-senarmont-mica-quarter-wave-compensating-slider-sl-1-4-lambda-plate-99534-2
- Representative video: https://www.microscopeparts.eu/play/99534-1
- Other parts from category Sliders: https://www.microscopeparts.eu/sliders
- More Sliders removed from microscope Lomo Polam L-213: https://www.microscopeparts.eu/sliders/from/lomo/polam-l-213
- More Sliders compatible with microscope Lomo Polam L-213: https://www.microscopeparts.eu/sliders/for/lomo/polam-l-213
- More Sliders removed from microscopes Lomo: https://www.microscopeparts.eu/sliders/from/lomo
- More Sliders compatible with microscopes Lomo: https://www.microscopeparts.eu/sliders/for/lomo

# 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