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Manual drive for auto iris objective

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Manual drive for auto iris objective

Postby sem81 » Mon Jun 22, 2015 8:17 am

I plan to use an auto iris objective for my logitech pro 9000 but i don't know how to manual drive the iris.

Someone have some experience or advice?

Thanks.

Stefano
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Re: Manual drive for auto iris objective

Postby WalterMo » Mon Jun 22, 2015 5:58 pm

Hi Stefano,
My advice is don't use an auto iris lens.
I have googled a bit because it was very interesting to me but I couldn't find details of its function. What I learned is that an external differential amplifier (normally in the camera) is necessary to control the aperture of the iris. I think a little DC motor with gear will open and close it. But additionally a sensor (close to the iris) must monitor the iris and give this information to the amplifier.

Walter
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Re: Manual drive for auto iris objective

Postby sem81 » Tue Jun 23, 2015 10:47 pm

Hi Walter,
thanks for your reply.

Some time ago i bought an auto iris pentax lens so i'd like to use it for my custom logitech camera.

i found this: https://www.youtube.com/watch?v=OnjwVRF6PiY

This is exactly what i need but i don't know how to build this circuit.
sem81
 
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Joined: Sat Sep 17, 2011 10:18 am
Location: Pavia, Italia


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