Hi. I am interested in buying ND filters for my A6000. I will be using my 10-18mm mostly which accepts 62mm filters. It seems to makes sense to buy ones that will fit my largest lenses when purchasing them and then use step up rings when using the filters with smaller lenses. I will most likely be getting a full frame camera in the future and most of the lenses I like will accept 72mm filters. As of today I have a 62mm lens so I will need to use two steps up rings assuming I buy 72mm filters. One from 62-67mm and another from 67-72mm.
Does anyone see an issue with this approach?
Also, how do I know what type to get? I assume it depends on how bright my scene is. I want to smooth out water in landscape shots. ND4?, ND8, etc?
In addition I read that I need to purchase ND filters specifically for my wide angle lens as using ones not specific to that application will yield poor results as well as vignetting. Is this true or just hype?