Focus mechanism - with Olympus' experience in producing optical microscopes
I don't know why they didn't use something they were familiar with, 2
concentric focussing knobs, one coarse and one fine. This would also have
been great on the OM bellows and focussing stage.
> -----Original Message-----
> From: olympus <olympus-
> bounces+wayne.harridge=structuregraphs.com@xxxxxxxxxxxxxxxxx> On
> Behalf Of Ken Norton
> Sent: Tuesday, 27 July 2021 5:24 AM
> To: Olympus Camera Discussion <olympus@xxxxxxxxxxxxxxxxx>
> Subject: Re: [OM] Photoessay: OM Zuiko 500mm f/8 Reflex
> I used a borrowed 600/6.5 a couple decades ago. While it was actually
> sharp and optically well-behaved, the lens itself was a disaster to use
> three reasons:
> 1. Stability. The slightest bit of wind or vibration would set it off. The
> balanced with the camera body on the tripod meant that it would rock or
> oscillate. Absolutely impossible to keep it still.
> 2. Vibration from the aperture-actuator mechanism. It set off a resonance
> the camera/lens combination that wasn't possible to avoid.
> 3. Focus mechanism. The rack-and-pinion focus was absolutely the most
> absurd focus mechanism I've ever tried using. I've used RaP focus
> mechanisms on other camera systems, but those seemed better balanced to
> the task. The thing I hated most is that while focusing, the camera moved.
> When coupled with shooting flash, the results are staggeringly sharp. But
> got maybe two or three sharp non-flash pictures over the time I had the
> AG Schnozz
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