Thanks for the input from other RFFers.
The discussion help me a lot.😉
1. It seems that a meterless M is not as difficult to use as I thought.
At least, it is still a user camera for many guys here. Not merely an
collection item put in a cabinet.
2. The use of built-in meter vs. handheld meter is so interesting.
I also found that the built-in meter of my R2 confused me a lot.
I need to check the meter more than when i am using other
mechanical cameras. The R2 meter sometimes does not response
to the changes in aperture/shutter speed. So, sometines, i simply
wait a few seconds and then pre-press the shutter button again to
check the expossure or simply guess the exposure if i don't want
to wait. Maybe, I need to send the R2 to the dealer for checking.
One has to juggle between, focusing, adjusting exposure, checking meter,
composing......Oh..... just too much for me.
I am afraid that using a meterless M will increase the hassles for taking photos.
Maybe, I can try to use R2 with the Sekonic 300B to see if I can manage the
photo taking process. If so, I think that I can manage a meterless M well.🙄
3. Regarding the choice of M2, M3 or M6 is a tough question.
Yes, I cannot plug my 35mm Summicron directly on an M3.
This is a draw back of an M3. But it is good for my 50mm DR.
Here in Hong Kong, M2 is the cheapest. M3 (a classic) is pricier than M2.
M2 and M3 usually cost about US$700~900. M6 costs about US$1100~1300.
Curently, there is an excellent M3 selling for $700 while a black M6 in similar
condition is selling at over $1200. The meter costs me $500!!!
As someone already pointed out, if I buy a M3 now,
I may also buy a M6 eventually. Or, maybe not.
If I buy the M6 first, I may or may not buy an M3.
Who knows.