(How) do you use filter for Leica Rangefinder in monochrome photography

[Einst_Stein]

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Digital Color converted monochrome is easy, I don’t need contrast filter, even If I want, I can use monochrome mode display to tell how it works. I guess this should work with digital monochrome camera too. But I give up contrast filtering on rangefinder film camera. 
 

What do you do?

[pegelli]

With a monochrome sensor I still use colour filters, there is no other way to change to which grey value the colour is converted.

On a colour sensor the only filter I (sometimes) use is a polariser, to lower haze and take out reflections (both for colour and B&W photography). The effect of most other filters when converting a colour image to B&W can be achieved by the colour mixer in the raw converter.

[jaapv]

 

7 hours ago, Einst_Stein said:

I guess this should work with digital monochrome camera too.

It doesn't as there are no colour data in the file.

[Keith (M)]

For outdoor photography whatever lens is on my M10M either a yellow or an orange filter will be fitted (partly depending on the amount of cloud).