Hi guys
I am looking at buying some k-mount extension tubes. I am wondering if there
is any difference in the performance of different brands? As if there like
the screw mount ones i have seen then there is no glass in the tube.
Are there any other cons of extension tubes?
Also what sort of size entension tube would need to get an M135/3.5 down to
say 1:2 or 1:1? if its possible.
Thanks,
Paul Jones
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