My Sony RX10 has a filter size of 72mm and K&F didn't appear to have that size in their range, so I am going to utilise a step up/down filter to allow me to use this 82mm on my 72mm lens. Once I find it!

Essentially this filter allows you to have a crisp, in focus image in the centreline of the filter but either side you will have a blurry but pleasing image similar to the results from a tilt shift lens but without the expense.

Price at the time of review was £28.99, there is a lot of glass here, and the K&F gear is always good quality.

If you are looking to produce alternate shots then this is a great system.

Esta es una RESEÑA de valoración para los artículos de venta en AMAZON con descripción:
K&F Concept 67mm Filtro Prisme de Dioptrías Divididas, Filtro de Efecto Prisma Lineal Vidrio Óptico K9, Refracción Borrosa Primer Plano Efecto.

Este es un filtro K&F concept (modelo de 67mm ) efecto Prisma de Dioptrías Divididas, con dos lentes en forma de semicírculos de vidrio enfrentados que dejan una zona lineal central sin vidrio de corrección y por tanto , si se establece una zona de A.F. central o un enfoque manual optimo en esta zona central , los contornos de esa linea central de imagen enfocada permanecen en desenfoque y con algo de halo blanquecino difusor dependiendo de la incidencia de la luz , como el anillo exterior del filtro es orientable, queda libre para el giro sobre su otro anillo soporte de fijación al portafiltro, pues podemos orientar el desenfoque arriba + abajo, derecha + izquierda, incluso de forma diagonal , para que se entienda mucho mejor y sea más visible incluso el efecto de este filtro en vez de en modo fotografía , he realizado varios videos editados en uno con varios encuadres para que podáis apreciar bien los efectos que se pueden conseguir con él (espero que sepáis apreciar el esfuerzo por mostrarlo ) y podáis ver el modo de utilizarlo en vuestras tomas artísticas, ya sea en modo fotografía o en modo video.
Además de la caja de protección como observaréis se remite un juego de 3 paños individuales pequeños de limpieza de la misma marca ; ( limpiar este tipo de filtro se hace un poco más delicado, hay que intentar evitar su ranura central ) .

Mi valoración para este KIT de filtro de efectos y paños de limpieza es de :
" 5 ESTRELLAS " = [ * * * * * ]. Espero les resulte Útil esta reseña. Un saludo.

This is really fun photographic filter. Having a diopter with a slice cut out of the middle lets you make photos where the centre is in focus, but the sides are blurred. Of course you can do something similar using photoshop, but I believe manipulating photos the organic low-tech way has an organic coolness that you just cannot achieve in digital editing.

I like that the filter can rotate freely when it is attached to the lens, but sometimes wish it was available in different “strengths” so I could choose how far out of focus I wish the edges to be. Based on the thickness of the glass this looks to be a #2 diopter. I think I could achieve more useful effects with a #1 diopter, or even a #0.5 one.

Like all K&F gear I own, this one is very precisely built and uses excellent quality glass. They also include a 3 pack of extremely useful little microfibre cloths for lens and filter cleaning and they work well.

I tested this filter on a Samyang 85mm F1.2 and a wide angle, it screws perfectly and then rotates without problem to direct the effect.

This type of filter makes it possible to break the plane of focus with therefore the central band not impacted (in theory) and then the sides on which the diopter filter plays the role of a magnifying glass.
It allows you to make various effects such as breaking the focus on the sides of a subject when the scene is remote, but it also allows you to put a subject back into the near macro level of sharpness while also having the central sharpness on a more distant point.
This can be seen quite clearly on my first test photo where we have a sharp first plane then blur then again a sharp plane then again blur, on the second I have a macro branch on the sharp side (as much as possible) then the focus 15m further in the center.
And the effect is therefore symmetric depending on the orientation of the slit in the filter, enough to place an element close to the ground in landscape mode plus focus on the horizon and blur what is between the 2 planes.

After there are some limitations, at an aperture of F1.2 almost impossible to have the slightest sharpness anywhere and regardless of the focus distance with this filter, I went down to F2.8 for these photos and even then there is a strong diffusion effect, especially in backlight.

With a longer focal length the filter tends to blend better into the image while with a wider angle it will start to be more pronounced in terms of the delineation between the glass on each side and the void. With lighting from the front or very slightly out of field that aims at the lens, we can also have games of flares and reflection/refraction.

With ideas there will be quite a few interesting things to do with them so.

This filter is really cool and makes a dreamy effect on your photos. Great for some "out of the norm" photos and for something different than your typical photo.

the filter is heavy, seems very high quality. can't wait to see what you can actually get with it.

The K&F Concept 77mm Centerfield Split Diopter Filter arrived neatly packed in a professionally printed box bearing the K&F branding.

The Centerfield Split Diopter filter offers a distinctive creative touch by producing a blurry refraction effect around the edges while keeping the center of the subject in focus. It turns ordinary shots into psychedelic and abstract works of art.

It’s perfect for various types of photography, whether you’re capturing landscapes, portraits, or working on artistic projects.

The K9 optical glass used in the filter offers high light transmittance and excellent colour reproduction.
Images come out clear and vibrant, and the special coating helps block stray light, maintaining image quality.

The adjustable frame is a nice feature, allowing you to rotate and tweak the filter to suit different settings and create the desired effect.

Plus, it comes with three microfiber cleaning cloths, which are incredibly handy for keeping the filter spotless. The cloths are vacuum-packed, lint-free, and gentle on the filter, making maintenance a breeze.

Bargain for an unusual addition to your photography equipment.

I've never used a centerfield split diopter filter before, so I have no other similar filter with which to compare this one. This seems to be of high quality metal and optical glass, as usual, from K&F.

I definitely like the different effects I can get using this. The images seem to change based on the focal length of the shot. You shoot so that your subject is in the middle where it will be in focus. The blurry refraction effect happens in the background and all around your subject. It makes for a pretty dramatic shot.

In the package, you get:
> diopter filter
> filter pouch
> storage box
> 3 cleaning cloths

The price is extremely reasonable compare to other similar filters that I've seen. The dramatic effect is going to be useful so I'm going to keep experimenting until I understand how to control the nuances of split diopter filter.

Ce filtre est vraiment cool et donne un effet de rêve à vos photos. Idéal pour certaines photos « hors norme » et pour quelque chose de différent de votre photo habituelle.

I've always been interested in trying a split diopter filter, so this was a fun piece to check out! It's definitely going to take a lot of getting used to, but so far, it's giving a really interesting effect, and I'm excited to get better with it. The threading is nice and smooth, and the whole piece has an excellent feeling quality, so I'm not worried about it damaging or getting damaged.