Rob Studdert said, about extension tubes:
> You can calculate the losses but it's difficult and lens dependent to an
> extent, this is one of the areas where TTL meters reign supreme.
Not difficult really, so much as _annoying_. But yeah, this is
one place where having TTL metering is soooooo nice. That's
one of the things I liked about having a Spotmatic -- since my
bellows and my extension tubes are screwmount, I need to replace
either the Spotmatic or the screw-to-K converter (yes, that got
stolen too) so I can shoot macro with less calculation again.
But you still have to do the math when you use a flash, unless
you also have TTL-flash mode available. (I guess the PZ-10
will do that for me, if I get the converter.)
My bellows has a scale engraved on it so that you can just look
up the exposure factor for a given extension ... as long as you've
got a 50mm lens attached (with some fudging for the in-between
amounts, of course).
-- Glenn
