Posted by Bill Fright on 08/02/07 22:07

Richard Crowley wrote:
> dh@. wrote:
>> We have JVC GY-DV500 cameras. I couldn't find a
>> model number on the lens itself, but the zoom unit
>> mounted on the side of the lens says:
>>
>> Fujinon S20 x 6.4 BRM-SD
>> 1:1.4 / 6.4-128mm
>>
>> I don't know what all that means yet.
>
> It is the model number and contains several key pieces of
> the specification (such as the zoom ratio, minimumm F-
> stop, type of camera attachment, etc.) It is easy enough
> to decode these numbers by browsing the Fujinon website.
>
>> The lens has
>> holes that look like they have threaded inserts in them,
>> for securing the manual focus unit etc to the lense with
>> a bolt. If they really are inserts in the holes, is it possible
>> to replace them? We have some that are broken off at
>> the outer end, so the bolt will no longer reach it.
>
> It might be possible that they used something like
> "Helicoil" thread inserts which allow you to replace the
> threads. But you may have to consider having the lens
> repaired by Fujinon or some experienced lens technician
> as they are too delicate and expensive to trust to your
> average mechanic:-)
>
>> Also, is it possible to get an iris control to mount on
>> the tripod handles? We have one for zoom and
>> focus, and it would be great to have one for iris too.
>
> Why? They don't typically provide iris controls for the
> camera operator (for a number of reasons). The iris is
> usually controlled electronically by the camera (or
> remotely by the camera control unit, etc.) The camera
> operator is rarely able to properly judge/adjust the iris
> which is why we usually either use the automatic
> exposure function of the camera (in single-camera
> shooting situations), or a person back in the control
> location will adjust the iris (and other parameters) of
> all the cameras in a multi-camera production.

Hey there Richard. Please take no offense but my thoughts of iris and
cam op are much different than yours. The above would work for a
completely inexperienced operator but I insist my cam ops have a good
understanding of what they're looking at.

You have dual zebra bars as do I. In the office I have a ccu and a
scope/waveform and have adjusted my zebras to where I can tell you
within 2 lumens where my exposure is any where on an image. This way
when I'm running and gunning I know just where the levels are. I'm such
a dope that while shooting I'll see a background highlight and make a
guess and compare it on scope when I get back to the office.

I do confess that I keep a CCU in my production rig but only use it to
quickly match other cameras. :/>



>
> Some cameras have a small control panel that you can
> plug in which include the iris control and can be mounted
> on the tripod arms.
>
> For example I have a Sony RM-M7G control unit for my
> Sony DSR-300 camera. Here is a picture...
> http://www.globalmediapro.com/av/attach/192/index-1391.jpg
> The iris control is the large black knob in the lower right.
>

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