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Posted by Richard Crowley on 08/02/07 14:45
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.
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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