Camera filters

[Pablo666]

This has been asked in a previouse thread but needs it's own thread. I have always used Cokin filters and I had to get ASAP an ND filter for the eclipse. I got this on Amazon which worked K&F CONCEPT 82mm Variable ND Filter ND2-400 1-9 Stops. BUT. it has a diameter of 88mm so why is it 82mm.

If I am to go down this K&F route, I looked at K&F holder
K&F CONCEPT: Metal Square Filter Holder 100mm with Adapters 49mm-82mm. According to Amazon help 100mm is the only size that will fit. My cokin filter folder accepts a round polariser filter as well as slots for the square filters. So what can I get if I am to transition to a K&F which is supposed to be the professionals choice?

So where should I go with all of this? I have already got a large collection of Cokin 'A' including the star range.

This holder only takes one filter and is expensive for what I get. Just one filter

https://www.amazon.co.uk/Concept-Square-ND1000-Adapter-version/dp/B09MK9TN3N/ref=sr_1_8?crid=1HQJ9ZOUXKO4C&dib=eyJ2IjoiMSJ9.8Ft8Nkn38uG2O-KpsI73DY05HoVd0HZVxyiaf7fz-mZIjcl9rx46padO6pPcyD8GDz7V85QYv8BtKEGtEP2NcI5jsxO7ZiK3yNQOFuT6NOekm-xUVISR4Xhs17DiTKKwGynUba-Gqbj2786pYWRryNYxSmgARSUjjaZZmPAhjxR5rQhng6dZL4m80Cwkc5KlheKlIxBgYFEpW6YlTS18bFVH_bdmmbIQ17Kbuzymh4tqFoNiqvFZIuLgys1T2pJbpuntsDrrvWBj4y_WN4s4cwYomYTsjThQfpt2iBhkkn8.AgOJT_dvuK47c0nSb_fVYNdXH58AQvz8prG1JArppRE&dib_tag=se&keywords=K%26F%2Bfilter%2Bholder&qid=1787136753&s=electronics&sprefix=k%26f%2Bfilter%2Bholder%2Celectronics%2C114&sr=1-8&ufe=app_do%3Aamzn1.fos.d7e5a2de-8759-4da3-993c-d11b6e3d217f&th=1

 

[GreenNinja67]

If you used a 9 stop ND for the eclipse I'm surprised you don't need a new sensor

 

[GreenNinja67]

And K&F are from from a professional filter series.

Think Nisi or Lee filters. Way better but more expensive.

I used Cokin, but that was the late 80's.