OMAX 40X Achromatic Objective Lens (Spring) - High NA 0.65

In this review the OMAX 40X achromatic objective lens is evaluated for hobbyists, students, and lab users seeking a reliable midrange magnification option. The bottom line: it delivers clear optical performance with a relatively high numerical aperture for a 40X lens, and the spring-loaded mount protects both the lens and slides during routine use. For anyone fitting a DIN 160/0.17 microscope tube and wanting a compact, serviceable 40X objective, this lens balances optical quality and practical durability.

Key Features

• 40X Magnification: Provides a useful midlevel magnification suited to cell observation and detailed specimen work without excessive working distance compromise.
• High Numerical Aperture: The NA 0.65 improves resolution and light-gathering compared with lower NA 40X options, yielding crisper detail on brightfield samples.
• DIN 160/0.17 Compatibility: The lens conforms to standard tube length and cover glass thickness, making it compatible with many compound microscope setups that use DIN specifications.
• Spring Loaded Design: The spring mechanism protects the front element and delicate slides by allowing slight retraction on accidental contact, reducing risk of damage.
• Compact Mount: The 20mm threaded mount makes installation straightforward on compatible nosepieces and keeps the lens stable during focusing.
• Warranty: A one-year warranty against manufacturing defects provides reasonable assurance for initial reliability.

Who It's For

The OMAX 40X achromatic objective is best for undergraduate labs, microscopy hobbyists, and educators who need a dependable 40X option with improved resolution thanks to its NA 0.65. Its DIN 160/0.17 design fits many classic and modern compound microscopes, so it is useful for users replacing or upgrading a single objective.

Users who need specialized contrast techniques beyond standard achromatic performance or who require long working distance objectives for thick samples should look elsewhere, since this lens focuses on conventional brightfield use with a 1.0mm working distance and standard cover glass compatibility.

Pros & Cons

Pros

• Solid optical performance for the price with a relatively high NA 0.65 that improves resolution.
• Spring-loaded protection reduces risk to both lens and slides during routine handling.
• Standard DIN 160/0.17 spec ensures broad compatibility with many microscopes.
• Included screw-on case helps keep the lens safe in storage and transport.

Cons

• The short 1.0mm working distance may limit use with thicker specimens or some mounting techniques.
• As an achromatic objective it is not optimized for advanced chromatic aberration correction like apochromatic lenses.

Specifications

Magnification	40X
Numerical Aperture	0.65
Standard	DIN 160/0.17 achromatic
Field of View	0.45mm
Working Distance	1.0mm
Mount Size	20mm thread (spring)
Warranty	1-year against manufacturing defects

Our Verdict

The OMAX 40X achromatic objective is a smart, value-minded choice for students and hobbyists who need dependable 40X performance with better resolution than lower NA lenses. Its spring-loaded mount and DIN compatibility make it easy to install and forgiving in daily use, though those needing long working distance or apochromatic correction should consider specialty objectives. Overall it is a practical replacement or upgrade for standard compound microscopes.

Frequently Asked Questions

Is this lens compatible with my microscope?
It is compatible with microscopes that accept DIN 160/0.17 objectives and a 20mm threaded mount; confirm your nosepiece accepts 20mm threads.

Does the spring feature affect imaging?
The spring is a protective mechanical feature and does not affect optical performance during normal use; it allows slight retraction on contact to protect the lens and slides.

What is included in the package?
The packing list includes the DIN 40X achromatic objective lens and a screw-on protective case.