Leica SL with R lenses modified Nikon AI with adapter Nikon AI/SL: easy focusing?

[Shepherdphotographer]

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Hello everyone, I have many Leica R lenses that I have used up to now on a Nikon D810 body, replacing the original Leica R bayonet with a Nikon AI.  I decided to buy (in a few days) a Leica SL;  since economically it is not convenient for me to have the bayonets changed again on all the lenses, I prefer to buy a single adapter from Nikon AI to Leica L and leave it mounted on the SL body.  Also, this way I could continue to use the same lenses on the Nikon D810, eventually.  Here on the forum I read that focusing with Leica R lenses on the SL (with R to L adapter) is very easy: can I be equally sure that it would also be easy with the Nikon AI to L adapter?  I also read that focusing is even easier on the SL2, but the SL2 costs too much for my possibilities today.  Thank you all in advance!  Good Light!

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[jaapv]

There will be no difference in manual focusing as it is done on the sensor, not by the mount. It is irrelevant which adapter you use. 
Make sure that you assign magnification to the Fn button. 

[Photoworks]

3 hours ago, jaapv said:

Make sure that you assign magnification to the Fn button.

where is the FN button on SL 601

[jdlaing]

3 minutes ago, Photoworks said:

where is the FN button on SL 601

It’s the button on the front. 
Stop Down/Function as it’s listed in the nomenclature.

[frame-it]

3 hours ago, jaapv said:

Make sure that you assign magnification to the Fn button. 

i keep magnification on the joystick press, much faster, the front Fn buttons are tricky while holding the grip

[jaapv]

I use the top one. 

[jaapv]

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48 minutes ago, Photoworks said:

where is the FN button on SL 601

or the plain chrome top one. 

[Shepherdphotographer]

Thank you jaapv, you answer is very precious!