limwhow : 20D with Hoya R72
Vngks: D60 with R72 equivalent
AlexK: D70 with R72 equivalent
Used Hoya R72 for 20D since the filter thickness is almost the same as the camera's original filter.
But it's a bit difficult to get a good Hoya R72 filter these days, so we used an R72 equivalent for D60 and D70.
If you're not happy with the effect, just pass me back the cameras. I will be getting a wide range of filters next month. You can choose what ever effect you want.
(Just top up a bit for the filter cost

)
The filter thickness will be the same as your camera's original filter and comparable to the cost of an ELP filter.