BTW, I should give you a run-down on the care and feeding
of mirrors, if you are not used to them... The low mass and
short length work against sharp photos due to the higher
vibration rate. Three ways to conteract these: hand holding
(!, but it works - shoot 1/500th or higher, shoot 4 identical
frames [one sharp, one not, two OK - usually...]), flash, and
tripod (with legs NOT extended, and damping weight [like a heavy
jacket] over top of lens and camera - mirror up). Rate the
film about 1/2 stop slower than normal (1/3 is close enough),
since the center "hot-spot" is where most meters meter,
leaving the overall frame a bit under exposed. Matte screen
area is used for focus - and focus is difficult, but results
are usually better than they look like they will be in the
finder (500 doesn't look really sharp in the finder, even
when it is [and is properly focused]). Performance is better
near medium-to-long distances, though it is still good close up.
(Long distances offer air-quality problems [heat waves and dust],
so may not provide sharp photos unless air is unusually clear
and calm [mornings, or at night]. To check 500mm sharpness,
shoot the moon - it is easy to take sharp photos of it, since
air quality shooting up is generally good - just keep exposure
times under 1/8th second or so [the moon moves FAST]. On a clear
night, a full moon well up in the sky is about 1/ASA shutter
speed for the 500mm [true speed is about f8 1/2].) Have fun with
it - and if a relatively tiny 500mm isn't enough, the TC14/14B
is fine with it, for 700mm (the filter is removed to fit the TC).
Which reminds me - the other filters are in the case cap top.