I think Peugeot's problem was easier, only one engine/gearbox/driveshaft
to balance. With an SLR you have mirror action in the vertical plane,
diaphram action in a different vertical plane and with a possible angle
off vertical and horizontal shutter action of 2 curtains that differ in
timing depending on shutter speed. Then all these variables interact
with a whole range of sizes and weights of lenses with different
vibrational modes and diaphram mechanisms. I think Oly's 'wetware
damping' solution may be the only practical 'proper engineering
solution' with so many variables. I do find that my Tokina 150-500/5.6
and Tamron 80-200/2.8, when firmly attached to a big, heavy tripod seem
to be more than the little Olys can vibrate much.
My dad had a 404 of about that vintage, bright red with tan leather
interior. First car I could do a 4 wheel drift in. The '47 Plymouth, 52
Dodge and 55 VW didn't do that without disasterous consequences. A great
looking, great riding car and really quick for so little power. Peugeot
was good at that. I had a gas 604 with a terrible power to weight ratio,
but gobs of torque. It would cruise the freeway fully loaded and towing
a boat with no problem and went up the hill I live on with less fuss and
shifting than the Audi 5000 TurboQuattro that replaced it.
Moose
Brian Swale wrote:
Hi,
I have puzzled over this phenomenon for quite some time.
It reminds me of the design of my favourite car of all time, the 1967 Peugeot
404 KF2, with Kugelfisher Fuel injection, just 1618cc and 100mph. My Q car.
When the 404 was first constructed, reports are that it was noisy and had
bad vibration. By the use of isolating devices and insulation the noise was
sorted out.
The solution to the residual vibration was interesting. There are two
rectangular cubic steel weights (about 3 times the volume of an old regular
match-box) attached to the rear of the gearbox where the drive-shaft exits,
and they are attached by separate and different-weight rubber blocks.
So Olympus technicians recommend using human arms and hands to
simulate this sort of solution. I wonder what a proper engineering solution
might be.
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