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Microscope Objective Turrets


  • Objective Lens Turrets with up to Five Ports
  • Mount RMS- or M25 x 0.75-Threaded Objective Lenses 
  • Connect to Microscope via SM1 Threads or D1T Dovetail

OT1

Objective Lens Turret,
RMS Threads 

CSN500

Cerna® Objective Lens Turret,
M25 x 0.75 Threads

CSN510

Cerna® Objective Lens Turret, 
RMS Threads

Application Idea

The CSN510 Nosepiece holding five objectives.

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Features

  • Easily Rotate Objectives in an Imaging System
  • Mount Four or Five Objectives at Once
  • OT1 Objective Lens Turret Compatible with SM1 Lens Tubes
  • Cerna® Objective Lens Turrets Compatible with DIY Cerna Components

Thorlabs offers four-position or five-position microscope objective lens turrets for mounting objective lenses in either horizontal or vertical orientations. The OT1 is a compact objective lens turret that has four RMS (0.800"-36)-threaded ports and an SM1-threaded mounting interface, making it compatible with Thorlabs' lens tubes. Our Cerna objective lens turrets have five mounting ports with either RMS or M25 x 0.75 threads. They have a D1T dovetail mounting interface for compatibility with the CSA1400 mounting arm, sold separately below.

Additionally, we offer a Post-Mountable Focus Block that includes a built-in five-objective turret.

Thorlabs Dovetail Referencea
Type Shape Outer Dimension Angle
95 mm Linear 95 mm 45°
D1N Circular Ø2.018" 60°
D2Nb Circular Ø1.50" 90°
D2NBb Circular Ø1.50" 90°
D3N Circular Ø45 mm 70°
D5N Circular Ø1.58" 90°
D6N Circular Ø1.90" 90°
D7N Circular Ø2.05" 90°
D1T Circular Ø1.50" 60°
D3T Circular Ø1.65" 90°
D1Y Circular Ø107 mm 60°
D2Y Circular Ø2.32" 50°
D3Y Circular Ø1.75" 90°
D4Y Circular Ø56 mm 60°
D5Y Circular Ø46 mm 60°
D6Y Circular Ø41.9 mm 45°
D1Z Circular Ø54 mm 60°
D2Z Circular Ø57 mm 60°
D3Z Circular Ø54 mm 45°
  • These dovetail designations are specific to Thorlabs products and are not used by other microscope manufacturers.
  • D2N and D2NB dovetails have the same outer diameter and angle, as defined by the drawings below. The D2N designation does not specify a height. The D2NB designation specifies a dovetail height of 0.40" (10.2 mm).
Mating Circular Dovetails
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This photo shows the male D1N dovetail on the trinoculars next to the female D1N dovetail on the epi-illumination arm.
Mating Linear Dovetails
Click to Enlarge

This photo shows the male 95 mm dovetail on the microscope body and the female 95 mm dovetail on the CSA1002 Fixed Arm.

Introduction to Microscope Dovetails

Dovetails are used for mechanical mating and optical port alignment of microscope components. Components are connected by inserting one dovetail into another, then tightening one or more locking setscrews on the female dovetail. Dovetails come in two shapes: linear and circular. Linear dovetails allow the mating components to slide before being locked down, providing flexible positioning options while limiting unneeded degrees of freedom. Circular dovetails align optical ports on different components, maintaining a single optical axis with minimal user intervention.

Thorlabs manufactures many components which use dovetails to mate with our own components or those of other manufacturers. To make it easier to identify dovetail compatibility, we have developed a set of dovetail designations. The naming convention of these designations is used only by Thorlabs and not other microscope manufacturers. The table to the right lists all the dovetails Thorlabs makes, along with their key dimensions.

In the case of Thorlabs’ Cerna® microscopes, different dovetail types are used on different sections of the microscope to ensure that only compatible components can be mated. For example, our WFA2002 Epi-Illuminator Module has a male D1N dovetail that mates with the female D1N dovetail on the microscope body's epi-illumination arm, while the CSS2001 XY Microscopy Stage has a female D1Y dovetail that mates with the male D1Y dovetail on the CSA1051 Mounting Arm.

To learn which dovetail type(s) are on a particular component, consult its mechanical drawing, available by clicking on the red Docs icon (Docs Icon) below. For adapters with a female dovetail, the drawing also indicates the size of the hex key needed for the locking setscrew(s). It is important to note that mechanical compatibility does not ensure optical compatibility. Information on optical compatibility is available from Thorlabs' web presentations.

For customers interested in machining their own dovetails, the table to the right gives the outer diameter and angle (as defined by the drawings below) of each Thorlabs dovetail designation. However, the dovetail's height must be determined by the user, and for circular dovetails, the user must also determine the inner diameter and bore diameter. These quantities can vary for dovetails of the same type. One can use the intended mating part to verify compatibility.

In order to reduce wear and simplify connections, dovetails are often machined with chamfers, recesses, and other mechanical features. Some examples of these variations are shown by the drawings below.

Male Microscope Dovetails
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Two examples of how circular male dovetails can be manufactured.
Female Microscope Dovetails
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Two examples of how circular female dovetails can be manufactured.

Standard Mechanical Interfaces on DIY Cerna® Components

The table below gives the dovetail, optical component threads, and cage system interfaces that are present on each DIY Cerna component. If a DIY Cerna component does not have one of the standard interfaces in the table, it is not listed here. Please note that mechanical compatibility does not ensure optical compatibility. Information on optical compatibility is available from Thorlabs' web presentations.

Item # Microscope Dovetails Optical Component Threadsa Cage Systemsb
95 mm D1N D2N D2NB D3N D5N D1T D3T D1Y D5Y C-Mountc
(1.00"-32)
SM1d
(1.035"-40)
SM30
(M30.5x0.5)
SM2e
(2.035"-40)
30 mmd 60 mme
2CM1 Internal & External Internal Yes
2CM2 Internal & External Internal Yes
BSA2000f Female
CEA1350 Male Female Yes
CEA1400 Male Female Yes
CEA1500 Male Female Yes
CEA1600 Male Female Yes
CFB1500 Male
CSA1000 Female
CSA1001 Female Internal Yes
CSA1002 Female Internal Yes
CSA1003 Female Yes
CSA1051 Female Male
CSA1200f,g Yes
CSA1400f Female Yes
CSA1500f,h
CSA2000f Female Internal Yes
CSA2001 Female External
CSA2100f Internal Yes
CSA3000(/M) Male
CSA3010(/M) Male Yes Yes
Item # 95 mm D1N D2N D2NB D3N D5N D1T D3T D1Y D5Y C-Mount SM1 SM30 SM2 30 mm 60 mm
CSC1001 Male
CSC1002 Male
CSC1003 Male
CSC2001 Male
CSD1001 Male & Female Female
CSD1002 Male & Female External
CSE2000 Male & Female Yes
CSE2100 Male & Female Female Internal Yes Yes
CSE2200 Male & Female Female Internal Yes Yes
CSN100f,i Yes
CSN200i Male
CSN210i Male
CSN500j Male
CSN510k Male
CSN1201g,i
CSN1202g,j
CSS2001 Female
LAURE1 Male Female
LAURE2 Male Female
LCPN1 Male Internal Yes Yes
LCPN2 Male Internal Yes Yes
LCPN3 Male Female Internal Yes
Item # 95 mm D1N D2N D2NB D3N D5N D1T D3T D1Y D5Y C-Mount SM1 SM30 SM2 30 mm 60 mm
OPX2400(/M) Male & Female Internal Yes
SM1A58 Male Male Internal External Yes
SM2A56 Male External
TC1X Male
WFA0150 Female
WFA1000 Yes
WFA1010 Internal Yes
WFA1020 Internal Yes
WFA1051 Internal Yes
WFA1100 Yes
WFA2001 Male & Female Internal & External
WFA2002 Male & Female Internal Yes
WFA4001 Male Female
WFA4002 Male Female
WFA4003 Male Female
WFA4100 Male External Internal
WFA4101 Male External Internal
WFA4102 Male External Internal
WFA4105 Male External
WFA4106 Male External
WFA4107 Male External
WFA4108 Male External
WFA4109 Male External
WFA4110 Male External
WFA4111 Male External
WFA4112 Male External
Item # 95 mm D1N D2N D2NB D3N D5N D1T D3T D1Y D5Y C-Mount SM1 SM30 SM2 30 mm 60 mm
XT95RC1(/M) Female
XT95RC2(/M) Female
XT95RC3(/M) Female
XT95RC4(/M) Female
XT95P12(/M) Female
ZFM1020 Female
ZFM1030 Female
ZFM2020 Female
ZFM2030 Female
  • Thorlabs' optical component thread adapters can be used to convert between C-Mount threads, SM1 threads, SM2 threads, and virtually every other optical thread standard.
  • Our cage system size adapters and drop-in adapter can be used to convert between 16 mm, 30 mm, and 60 mm cage systems.
  • C-Mount and CS-Mount standards feature the same 1.00"-32 threads, but C-Mounts have a 5 mm longer flange-to-sensor distance.
  • Our 30 mm cage plates can convert between SM1 lens tubes and 30 mm cage systems.
  • Our 60 mm cage plates can convert between SM2 lens tubes and 60 mm cage systems.
  • Attach to a ZFM focusing module to add a female 95 mm dovetail.
  • The CSA1200 mounting arm is compatible with the CSN1201 and CSN1202 nosepieces.
  • This blank arm is designed for custom DIY machining for non-standard components, threads, and bores..
  • This nosepiece directly accepts M32 x 0.75 objective threads.
  • This nosepiece directly accepts M25 x 0.75 objective threads.
  • This nosepiece directly accepts RMS (0.800"-36) objective threads.

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Microscope Objective Lens Turret, Four Ports

  • Four RMS-Threaded Objective Lens Ports
  • SM1-Threaded Mounting Interface
  • Bi-Directional Repeatability: ±2.5 µm

The OT1 is a compact objective lens turret with four RMS (0.800"-36)-threaded ports. The aluminum housing has steel inserts at critical points to ensure the durability and precision of the detent mechanism, which reproducibly positions the objective lenses with a high degree of accuracy. The mounting interface for the OT1 objective lens turret has SM1 (1.035"-40) threading so that it can be easily integrated into custom imaging systems built using Thorlabs' Lens Tube and Cage Systems. To mount the OT1 turret in a cage system, use a CP02(/M) or CP02T(/M) for a 30 mm cage system and an LCP02(/M) for a 60 mm cage system.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
OT1 Support Documentation
OT1Objective Lens Turret, 4 RMS-Threaded Objective Ports
$340.87
Lead Time

Cerna® Microscope Objective Turrets, Five Ports

Item # CSN500 CSN510
Number of Objectives Five
Objective Threads M25 x 0.75 RMS
Parcentricity, Single Positiona ±10 µm
Parcentricity, All Positionsb ±40 µm
Parfocality, Single Positionc ±2 µm
Parfocality, All Positionsd ±10 µm
Required Mounting Arm CSA1400 Mounting Arm
  • Maximum deviation for a single position after a full rotation of the nosepiece.
    Measured using 40X objective.
  • Maximum deviation from center of FOV when moving from one position to the next. Measured using 4X and 40X objectives. System alignment optimized for 4X and 40X at starting position.
  • Maximum Z axis deviation for a single position after multiple rotations. Measured using 40X objective.
  • Maximum Z axis deviation of all positions compared to position 1. Measured using 40X objective.
Test Target Mount
Click to Enlarge

The CSN510 Nosepiece mounted with the CSA1400 arm in a DIY Cerna System.
  • Five RMS- or M25 x 0.75-Threaded Objective Lens Ports
  • D1T Dovetail Mounting Interface for Compatibility with the CSA1400 Mounting Arm
  • Bi-Directional Repeatability: ±40 µm

These nosepieces hold five objectives in DIY Cerna systems. They are ideal for constructing systems that require multiple low- and high-magnification objectives. The objective turret's housing and threads are made from lead-free bronze, with an aluminum back plate. The precision detent mechanism is designed with a hardened 440C stainless steel ball on a cantilever spring that engages the grooves machined into the bronze housing. The detent mechanism can position the objective lenses with a bi-directional repeatability of ±40 µm. The table to the right gives performance specifications for the turrets when integrated into well aligned systems, where all components are aligned horizontally and vertically to the optical axis. Every nosepiece is tested and shipped with a data sheet.

The CSN500 nosepiece is compatible with M25 x 0.75-threaded objectives, while the CSN510 accepts RMS (0.800"-36)-threaded objectives. We do not recommend using thread adapters with these holders because centricity misalignments may occur.

Each nosepiece has a male D1T dovetail and can be attached to a motorized focusing module via the CSA1400 Mounting Arm (sold separately). Recessed magnets on the CSA1400 arm mate to the bellows included with Cerna microscope bodies with epi-illumination arms, creating a light-tight optical path between the nosepiece and the epi-illumination arm. On a DIY Cerna System, the nosepiece should be mounted with the dovetail facing away, so the nosepiece tilts upward, as shown to the lower right.

Test Target Mount
Click to Enlarge
The objectives can be changed by manually rotating the front face of the nosepiece.
Test Target Mount
Click to Enlarge
The CSN510 is shown with objectives of increasing magnification.
Quintuple Nosepiece
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The back of each nosepiece has a D1T dovetail. This dovetail is used to attach to the CSA1400 Mounting Arm.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CSN500 Support Documentation
CSN500Nosepiece for 5 Objectives, M25 x 0.75 Threads
$1,039.68
5-8 Days
CSN510 Support Documentation
CSN510Nosepiece for 5 Objectives, RMS Threads
$1,039.68
Lead Time
CSA1400 Support Documentation
CSA1400Mounting Arm for CSN200 and CSN500 Series Nosepieces
$312.97
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