Hello Norman,
I believe the problem is that the distance is too short for the lens so it can
not be properly focused. The focus should be achieved with the iris completely
open. The solution is very simple - you need to add extra 5mm adapter ring (
https://www.google.com/search?q=5mm+adapter+ring ) between the camera and the
lens (there will be two rings if you already have one installed).
Andrey
Subject: [Elphel-support] Help on short distance focusing [SEC=UNOFFICIAL]
From: "XIONG, Norman"<n...@ansto.gov.au>
Date: Thu, 25 Aug 2022 05:41:15 +0000
To: "Elphel Support"<support-list@support.elphel.com>
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Dear Elphel Support team,
Can you advise on how to make the picture bright enough for a short distance
focus?
We have a NC353L system with a 55mm F#1.8 lens. And we need to focus on an
object that is 340mm away from the lens. When I expand the aperture to make the
picture bright, I can't make it focus. If I make it focus, I have to change the
depth and it becomes very dark. Is there a way to improve the brightness for
such a short distance focusing,
such as adding a spacer to the lens system?
The system configuration:
FPS: 60
Manual Exposure: 250ms
Auto WB: OFF
Auto Exposure: OFF
Please see attached image snapshot and configuration files for detail.
Thank you.
Regards,
Norman
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From: <support-list-requ...@support.elphel.com>
Date: Wed, 24 Aug 2022 22:42:04 -0700
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