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Problem with Cooke 10.4-52 iris not responding?


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#1 David Odell

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Posted 05 July 2010 - 03:23 AM

Hi,

I have a Cooke 10.4-52 which is to be used this summer for a couple of scenes. The question I have is whether the iris ring should make the viewfinder darker/lighter when changing stops? Because when I tried with the Zeiss kit al of them hade the viewfinder darker/lighter when changing stops.

So simply, is the zoom unusable, as in need for service? Or dosn't the Cooke zoom show any change in light in the viewfinder?

Major thanks!
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#2 Brian Drysdale

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Posted 05 July 2010 - 05:12 AM

The viewfinder will darken as you stop down, so you should send the lens to be serviced. The lens could be used at a pinch if you only using it at the aperture the iris is stuck at, but it really need serviced otherwise you're wasting an excellent piece of glassware.
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#3 David Odell

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Posted 05 July 2010 - 06:43 AM

Thanks for the reply.

So until the zoom gets serviced, is there a way to determine at what F the iris is at? Asking because I don't know how long it would take to get it serviced.

Best,
David
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#4 Brian Drysdale

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Posted 05 July 2010 - 08:34 AM

It would be easy if your camera has an exposure meter, but just looking into the lens you might be able to see if the iris stuck wide open. An alternative would be to shoot an exposure test using a short end.
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