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Posted by Pat Horridge on 10/27/51 11:27
I don't think the lens can have a setting for auto mode.
It's the camera that tells the lens to open or close when in auto mode based
on the level of light being processed.
Most camera have an adjustment for their Auto iris level that controls what
level the camera wants the lens just follows the control sent from the
camera.
That's also how cameras often offer the option in a menu to bump the auto
iris up or down a bit.
"Steve Wills" <steventv@insightbb.com> wrote in message
news:BF584592.1293F%steventv@insightbb.com...
>
> Also, the only adjustment available on this lens is the iris gain to
> control
> the speed of the iris opening and closing.
>
> It has no other "trim-pots" to adjust in the front...
>
>
> On 9/22/05 10:18 AM, in article BF58355D.12933%steventv@insightbb.com,
> "Steve Wills" <steventv@insightbb.com> wrote:
>
>>
>>
>> I have a Canon YH18x6.7KSR lens on my GY-DV 500 camera (love it), but,
>> its
>> picture is always too hot in auto iris.
>>
>> Do you know if the auto iris on the lens can be mechanically changed
>> (other
>> than manually) to stop down to a acceptable level?
>>
>> Even with setting the camera to factory defaults, it is still hot, so I
>> think it must be in the lens. Canon checked the lens
>> and said it is working fine, but gave no hint as to how to keep the auto
>> iris from being too hot. They didnt even answer my question about it
>> which
>> is why I sent it to them in the first place.
>>
>> Is there any mechanical adjustment I can do to the lens to make the
>> auto
>> iris stop where I want it *in auto*, instead of the
>> lens making the default adjustment and the picture being too hot?
>>
>> Ive contacted JVC and he told me, other than the backlight adjustment,
>> the
>> camera couldnt be set any other way.
>>
>> This cameras picture is running way hot (about 3 f stops sometimes) and
>> it
>> was just serviced and checked at JVC.
>>
>> Others have had the same problem but I dont know what they did to
>> correct
>> this. Im figuring there must be a mechanical set-screw or
>> "trim-pot" that determines where the auto iris stops under different
>> lighting conditions. Its very consistent, but just over-exposed in auto.
>>
>> Do you have any suggestions?
>>
>> Thanks for the help.
>>
>
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