Thorlabs TTL165-A Tube Lens

Thorlabs TTL165-A Tube Lens

🔍 Product Overview

Key Specifications:

• Tube Lens, f = 165 mm: Specifically designed to work with Zeiss objectives, providing the intended system magnification when paired appropriately. 

• AR Coating (Broadband 350–700 nm): Optimized for visible wavelengths, particularly strong performance at shorter (<480 nm) wavelengths such as 405 nm illumination.

• Working Distance: ~118 mm measured from the housing edge to the image plane.

• Pupil Distance Range: 50–150 mm, allowing flexibility for alignment with different objective designs.

• Field Size: Rated for a 22 mm image circle (diffraction‑limited), which covers most scientific camera sensors up to Four‑Thirds format.

• Threads: External SM2 (2.035″‑40) threads on both ends for integration with Thorlabs 2″ lens tube systems. 

🧪 Application & Compatibility

• Best used with Zeiss infinity-corrected objectives: When used with Zeiss objectives, system magnification equals objective-specified magnification. With non-Zeiss objectives, actual magnification scales linearly with the ratio of TTL165‑A’s focal length to the focal length assumed by the objective manufacturer.

• Popular in DIY microscopy and light‑sheet systems: Many open-source or lab‑built light‑sheet microscopes and OPM (Oblique Plane Microscopy) designs incorporate the TTL165‑A for its compatibility and image quality.

• System integration: Suited for building on Thorlabs’ lens tube systems or DIY Cerna® platforms using SM2-compatible spacers (e.g. SM2L27) or dovetail adapters.