Exploring 45mm focal distance lenses opens up a world of hands-on optics for virtual reality, science education, macro photography, and DIY projects. This guide highlights five selected lenses with clear focal length and practical features so makers and hobbyists can compare performance, mounting options, and image clarity. Each product is evaluated for suitability in hobbyist VR viewers, classroom experiments, and close-up imaging tasks.
Summary of chosen products
- Pop-Tech Biconvex Lens Set, 34mm Diameter, 45mm Focal Length
- JECOMPRIS Biconvex VR Lenses, 20 Pack, 45mm Focal Length
- Pop-Tech Glass Lens Bi-Convex, 34mm Diameter, 45mm Focal Length
- 20pcs Focusing Convex Lens, 45mm Focus Distance, Easy Magnification
- Kase Master Macro Lens Plus, 45-85mm Focus Range
Pop-Tech Biconvex Lens Set for DIY Google Cardboard
The Pop-Tech biconvex lenses are designed with a 34mm diameter and a 45mm focal length. They are described as high-definition plastic lenses that help deliver a better 3D impression when used in simple Google Cardboard-style VR headsets. The lenses are intended to be sandwiched between card layers, with no mounting tabs. This makes them easy to adapt for DIY VR projects and educational demonstrations, though alignment and secure mounting should be considered for stable viewing experiences.
Pop-Tech 34mm Bi-Convex Lenses for Cardboard VR
Another Pop-Tech entry presents a similar 34mm diameter bi-convex lens with 45mm focal length, marketed for DIY Google Cardboard VR projects and virtual glasses. The description emphasizes a one-sided curved surface and a flatter opposite side, ensuring a fit for VR goggle shells. The lenses are positioned to support enhanced depth perception in simple, low-cost VR assemblies, making them a practical option for classroom makerspace activities and hobbyist VR builds.
JECOMPRIS Biconvex VR Lenses – 20 Pack
This 20-pack from JECOMPRIS combines 25mm x 45mm biconvex acrylic lenses with a flanged winged design. The focal length is 45mm, optimized for depth cues in DIY viewers. The flanged edges are intended to lock into slots in custom VR housings, which reduces wobble and improves stability during use. The set is pitched as suitable for STEM projects, classroom use, and maker projects where multiple lenses are needed for experiments or parallel builds.
Pop-Tech Glass Bi-Convex Lens Set for Cardboard VR
This listing highlights a glass bi-convex lens option from Pop-Tech with the same 34mm diameter and 45mm focal length. The product notes emphasize suitability for DIY Google Cardboard-style VR projects, suggesting compatibility with hobbyist headsets and virtual glasses builds. The emphasis on glass optics suggests potential improvements in clarity and reduced edge distortion compared with basic plastics, though actual performance depends on the assembly quality.
20pcs Focusing Convex Lens Dia 25mm – 45mm Focal Length
This EasyFA set offers 25mm diameter double-convex lenses with a stated 45mm focus distance. The kit emphasizes magnification capabilities for precise observation and has a crystal glass optic design to minimize aberrations. The multiple-lens package supports experimentation with focal length, magnification, and alignment in VR viewers, microscopes, or macro setups. A straightforward option for classrooms and hobbyists seeking bulk lenses for project diversity.
Kase Master Macro Lens Plus for Mobile Devices
The Kase Master Macro Lens Plus offers a longer focus range of 45-85mm, designed for macro photography on phones and other mobile devices. While not strictly a 45mm fixed focal length, the product highlights reduced vignetting and multi-coated optical glass for improved image quality. The longer focusing distance is beneficial for shooting small subjects like insects or jewelry with minimal blocking of light, and it provides practical flexibility for mobile macro projects and travel photography.
Buying Guide: Key Considerations For 45mm Focal Distance Lenses
- Focal length and compatibility: A 45mm focal length often targets depth perception in VR or magnification in macro setups. Check the lens diameter and mounting compatibility with your device or DIY frame to ensure a proper fit.
- Material and optical quality: Plastic lenses may be lighter and cheaper, but glass options can offer higher clarity and less distortion. Consider coatings that reduce glare and improve contrast for your specific use case.
- Mounting and stability: Lenses with flanged designs or slots help secure the lens in DIY viewers, reducing wobble. For handheld or classroom use, stable mounting is crucial for repeatable results.
- Purpose alignment: For VR viewers, alignment and focal pairing with the display are critical. For macro and microscopy, working distance and parfocal behavior affect focus accuracy and ease of use.
- Bulk vs. single lenses: Sets with multiple lenses are ideal for classrooms, experiments, or multi-project builds. For curated single-project use, a higher-quality, purpose-built lens may be preferable.
- Coatings and aberrations: Multi-layer coatings reduce reflections. Be aware that cheap or uncoated lenses may exhibit color fringing, especially at higher magnifications.
- Safety and handling: Some thin lenses can be fragile. Handle with care and store in protective cases to prevent scratches or cracks.
Across these options, the 45mm focal length is consistently presented as a practical choice for creating immersive VR experiences, educational demonstrations, and precise magnification in DIY projects. When selecting lenses, consider the intended assembly, ease of mounting, and whether you need bulk lenses for experiments or a single high-quality piece for a focused build.