Changing aperture with DOF preview enabled

Fellow Pentax 67 users,

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When doing closed-down metering with extension tubes

I find that I'm paranoid about changing the aperture

of the lens with the Depth of field preview enabled.

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My question is: does changing the aperture of the lens

with the depth-of-field preview enabled damage the lens

in any way? Or is my reluctance just another in a

long list of irrational fears?

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Thanks,

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Bill Hahn

Hi Bill,

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There is no technical reason why this would damage the lens in any

way!

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Do not worry too much about technical stuff it is designed to be a

tool for photography! and not the otherway around

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Kind regards Gert Jan

Bill, I've done this many, many times with every lens I use both on

and off the camera. It has been completely safe.

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Bob