Focal Length and Angle of View
gurinder dhiman
focal point (CCD sensor chip). FL, as well as the CCD chip's format,
is the major factor to determine the angle of view of a lens. For
example, a 6.0mm FL lens on 1/3" sensor format has 56.8 degree of
diagonal angle of view and a 5.0mm FL lens on 1/3" sensor format has
66.9 degree. But, the same 6.0mm FL lens can see 75.5 degree on 1/2"
sensor format. The angle of view also varies a little depending on the
manufacturer of the lens.
For 1/3" CCD chip camera, the following formula is a simple way to
determine the focal length of a lens needed.
(Distance to subject / Width of subject) x 4.5mm = Focal Length.
For example, if you want to watch a subject of 5.5ft width at 10ft
distance with a 1/3" CCD camera, you will need a 8.0mm FL lens. That
is, 10ft / 5.5ft x 4.5mm = 8.18mm. A 8.0mm FL lens mounted on 1/3" CCD
camera will cover the subject you want to watch.
Amit Amarpuri
Please have you private conversation in private. Please do not irritate us &
flood our mailbox with your private discussions.
Sincere Regards,
Amit Amarpuri
9891554831
Star Catalyst | F-1899B, First Floor, Opp. B-50, South Ex-I,New Delhi-
110049 | am...@starcatalyst.net | www.starcatalyst.net |
This email is intended solely for the person or organisation to which it is
addressed. It may contain privileged and confidential information. If you
are not the intended recipient, you are prohibited from copying, disclosing
or distributing this email or its contents (as it may be unlawful for you to
do so) or taking any action in reliance on it. If you have received this
email by mistake, please delete it. Then advise the sender immediately by
reply email to am...@starcatalyst.net. An email reply to this address may be
subject to monitoring for operational reasons or lawful business practices.
P Please don't print this e-mail unless you really need it. Save paper to
save environment.
No virus found in this outgoing message.
Checked by AVG Avira.
--
You received this message because you are subscribed to the Google Groups
"SecuritySystem" group.
To post to this group, send email to rkinst...@googlegroups.com To
unsubscribe from this group, send email to
rkinstrument...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/rkinstruments?hl=en