SUMMARY
The K&F Concept ND1,000,000 is a 20-stop neutral density filter designed for long-exposure photography, but it also functions effectively for solar imaging with mirrorless cameras. Its screw-in design is a lightweight and durable alternative to fragile solar film systems, making it ideal for eclipse travel. While it produces pleasing images with good contrast, it is not a certified solar filter and should only be used with mirrorless cameras or DSLRs in Live View mode, never through an optical viewfinder. Dedicated solar filters remain superior for safety and image sharpness, but the K&F filter offers a capable, travel-friendly option for casual solar photography and general creative long-exposure use.
TAKEAWAYS
The K&F Concept ND1,000,000 is a 20-stop ND filter suitable for long exposures and solar photography.
Its compact, screw-in design is durable and travel-friendly, unlike delicate solar film.
It is best used with mirrorless cameras or DSLRs in Live View mode, not optical viewfinders.
While capable for solar imaging, it is not a dedicated solar filter and requires caution.