K&F CONCEPT Four dioptres, +1 +2 +4 +10, 77 mm, nano coating
Fifty-three euros for +1 to +10 in 77 mm with a nano coating, an EVA case — and the only page here that names the aperture and the focal length to use.
- Dioptre strength
- Four: +1, +2, +4 and +10, in the first bullet, which also says several filters can be combined to increase magnification and that the higher the dioptre the shorter the close range. That last clause is the working-distance answer the other pages leave out
- Filter thread
- 77 mm, in the title — the size the buying advice above recommends buying for, because a step ring brings a large filter down to a small lens and costs 11 € on this same shelf
- Element count
- Not published. The second bullet describes highly transparent optical glass with a coating; it claims no doublet and no apochromatic correction, which is what separates it from the 139 € NiSi. The first bullet is candid about the trade: this is macro at a fraction of the cost of a macro lens
- Whether the set is achromatic
- NO — and this page is the one that says so between the lines. Its first bullet calls the set macro at a fraction of the cost of a macro lens, and its answer to edge softness is advice rather than glass: stop down to F5.6–F11, stay at 35 mm or longer. The coating is multi-layer and described at length; the CORRECTION is never claimed, and a coating suppresses reflections rather than colour fringing. The 139 € NiSi here is where the doublet begins
- Coating described
- FULLY, and it is the best coating description on this shelf: a multi-layer AR nano coating on highly transparent optical glass, credited with markedly increased transmission, stray-light-free imaging, effective suppression of flare and ghosting, and an image with no darkening and no colour cast
- What a multi-piece set contains
- A high-density EVA case with four separate compartments, described as shock-, break- and pressure-resistant, plus THREE dust-free vacuum-packed cleaning cloths, in the fourth bullet. The fifth adds a precision-machined metal filter ring and scratch-resistant glass
- Amazon reference
- B0H86QPKBH (same reference on 6 Amazon marketplaces)
- EAN
- 6942610305493
- The only page here that names an aperture range: F5.6 to F11 for best sharpness
- The only one that names a focal length floor: 35 mm and up, to avoid vignetting
- No element count and no achromatic claim, at 53 €
Best for: A 77 mm lens used carefully — stopped down, at 35 mm or longer — where the coating and the advice are worth more than the extra 33 €.