EDMUND OPTICS 65-801 Mount Filters M30.5 25MM

( Brand: Edmund Optics ), ( Manufacturer Part Number: 65-801 ), ( Part Type: Mount Filter ), ( Filter Size: 25 Mm )

Review EDMUND OPTICS 0.5 Mount 25mm Diameter Filters #65-801

The **Edmund Optics 65-801 M30.5 x 0.5 Mount for 25mm Filters** is a precision-engineered adapter designed to seamlessly integrate 25mm optical filters into camera or microscope systems equipped with a **M30.5 x 0.5 thread**, a standard mounting interface commonly found on high-end DSLR, mirrorless, and scientific imaging lenses. Crafted with meticulous attention to detail, this mount features a robust, all-metal construction that ensures durability and stability, minimizing vibrations and misalignments during critical imaging sessions. The **M30.5 x 0.5 thread**, a metric standard with a 30.5mm diameter and a 0.5mm pitch, provides a secure and repeatable connection, allowing for quick and reliable attachment of filters without compromising optical performance. Ideal for applications ranging from astrophotography and macro photography to microscopy and industrial inspection, this adapter maintains precise alignment of the filter within the optical path, reducing flare, ghosting, and chromatic aberrations that can degrade image quality. Its compact yet sturdy design ensures compatibility with a wide range of filter sizes, including 25mm, 37mm, and other standard diameters when used in conjunction with additional step-up or step-down rings, making it a versatile solution for photographers and researchers who demand both flexibility and precision. Whether used in conjunction with polarizing filters, neutral density filters, or specialized optical coatings, the Edmund Optics 65-801 delivers consistent performance, ensuring that every captured image or observed specimen retains its clarity and fidelity. Built to withstand frequent use in demanding environments, this mount exemplifies Edmund Optics commitment to quality engineering, offering a reliable bridge between filter systems and imaging equipment for professionals who refuse to compromise on optical integrity.

**Pros and Cons of buying a Edmund Optics 65-801 M30.5 0.5" Mount for 25mm Filters**

### **Pros**

The Edmund Optics 65-801 adapter is a practical and cost-effective solution for photographers and astrophotographers who need to transition between different filter sizes or mount types. Here are its key advantages:

1. **Compatibility with 25mm Filters** The adapter allows the use of standard 25mm screw-in filters (such as those from Hoya, B W, or Tiffen) on cameras or telescopes that require a 0.5" (12.7mm) filter thread. This is particularly useful for DSLRs, mirrorless cameras, or astrophotography setups where native 0.5" filters are not available.

2. **Cost-Effective Alternative** Compared to purchasing a full set of 0.5" filters, this adapter lets users repurpose existing 25mm filters, saving money. It also eliminates the need for additional filter holders or step-down rings in some cases.

- Attaching a 25mm filter to a camera with a 30.5mm filter holder (common in some DSLRs).

- Extending the use of 25mm filters on telescopes or other optical systems that require a 0.5" thread.

- Acting as a bridge between different filter systems without requiring multiple adapters.

4. **Durability and Quality** Edmund Optics is a reputable manufacturer known for precision optical components. This adapter is likely made from metal (likely aluminum or steel), ensuring stability and resistance to wear over time.

5. **No Additional Hardware Needed** Unlike some adapters that require extra rings or spacers, this direct conversion allows for a straightforward attachment of 25mm filters to a 0.5" mount, reducing clutter in the filter drawer.

6. **Compatibility with Astrophotography** For astrophotographers using telescopes or specialized cameras, this adapter can help integrate standard filters (e.g., ND, polarizing, or color correction filters) into setups where native 0.5" filters are not available.

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### **Cons**

1. **Thread Interference Risk** The 0.5" thread is significantly smaller than a 25mm or 30.5mm thread. Over time, repeated attachment and removal of filters can cause wear on the threads, potentially leading to loosening or difficulty in securing the filter properly. This is more of a concern with frequent use.

2. **Potential for Light Loss** The adapter introduces an additional surface between the filter and the lens or camera sensor. While the impact is minimal, there may be a slight reduction in light transmission compared to a direct filter mount, though this is usually negligible for most photographic applications.

3. **Limited to Specific Use Cases** This adapter is only useful for transitioning between 25mm filters and a 0.5" mount. If you need to use other filter sizes (e.g., 36mm, 39mm, or 49mm), you would require additional adapters or step-down rings. It does not solve all filter compatibility issues.

4. **Potential for Misalignment** If the adapter is not perfectly centered or if the filter is not seated correctly, there is a small risk of vignetting (darkening at the edges of the image) or slight misalignment, especially in wide-angle photography. However, this is rare with high-quality adapters like this one.

5. **Not Universal** The M30.5 thread is specific to certain camera systems (e.g., some Canon DSLRs). If your setup does not have a 30.5mm filter holder, this adapter will not be useful. Always verify compatibility with your equipment before purchasing.

6. **No Built-in Polarizer or ND Filter Mounts** This is a simple step-down adapter and does not include features like a polarizer or ND filter holder. If you need these, you would still require separate accessories.

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### **Ending Conclusion**

The Edmund Optics 65-801 M30.5 to 0.5" adapter is a practical and affordable solution for photographers and astrophotographers who need to use 25mm filters on systems requiring a 0.5" mount. Its primary strength lies in its versatility, cost savings, and compatibility with standard filter sizes. However, it is not a universal fix and may introduce minor drawbacks such as thread wear or potential misalignment over time.

For most users who need a straightforward way to repurpose 25mm filters on a 0.5" mount, this adapter is a solid choice. It is particularly valuable for astrophotographers, landscape photographers using telescopes, or those who already own a collection of 25mm filters and want to extend their use.

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### **Recommendation**

- You own 25mm filters and need to use them on a camera or telescope with a 0.5" mount.

- You are working with a system that uses a 30.5mm filter holder (e.g., some Canon DSLRs) and want to attach 25mm filters directly.

- You are on a budget and want to avoid purchasing a full set of 0.5" filters.

- You prioritize simplicity and do not require advanced features like built-in polarizers or ND filters.

- Your setup does not include a 30.5mm filter holder, making the adapter incompatible.

- You frequently use wide-angle lenses where misalignment or vignetting could be an issue (though this is rare with this adapter).

- You need to use filters larger than 25mm, as this adapter does not accommodate those sizes.

- You are looking for a more permanent or high-end solution (e.g., a dedicated filter holder system).

**Final Verdict:** This adapter is a practical and cost-effective tool for specific use cases, particularly for those who already have 25mm filters and need to adapt them to a 0.5" mount. It is a worthwhile purchase for photographers and astrophotographers who want flexibility without investing in an entirely new filter system. Always ensure compatibility with your equipment before purchasing.

Details:

Essentially same as new condition. Sells for $59.00 on Edmund Optics. Used once for an experiment, no longer needed.

part #: 65801 prices

• $96.99-$239.00

specifications filtecam:

• brand: Edmund Optics
• mpn: 65-801
• part type: Mount Filter
• filter size: 25 Mm

general filtecam:

• condition: Used
• Cameras Photo > Lenses Filters > Filters

offer filtecam:

• quantity: 1
• availability: In Stock
• sold: 0
• started: May 29, 2026
• options: Ship-to-home

returns filtecam:

• policy: No Returns

payments filtecam:

• other
• wallet: Google-pay
• credit card: Discover

seller filtecam:

• # reviews: 314
• rating: 100.0%
• city: Broomfield, Colorado

shipping filtecam:

• type: Calculated
• service: USPS Ground Advantage
• class: Standard
• transit: 6-12 Days
• cost: $0.00
• carrier: USPS

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