Originally posted by kerrowdown You'd have to find a good one, a flat field and without flaws, imperfections or distortions that would show up in the images.
Otherwise it should work fine, out of interest what value ND do they work out to be roughly?
There seem to be several dark levels. I really dont know and I have not done any calculations.
The one that I used for the images above was rated DIN9.
Depending on where I was pointing it to I realised that I could make out objects in liveview. Meaning the glass wasnt stopping enough light.
I just picked myself a DIN14 last friday. I was told it was the darkest they have. My guess is that it will be equivalent to ND10.
Keep in mind though that depending on the type glass there will be a green or purple cast on the image. You will have to remove that during PP.
It was not that difficult to do in my case.