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SCUBA-L  July 2001, Week 1

SCUBA-L July 2001, Week 1

Subject:

Re: SCUBA Cameras, Photography was Re: Dive, Dive, Dive

From:

Quinn Harry <[log in to unmask]>

Reply-To:

Scuba diving discussion list <[log in to unmask]>

Date:

Tue, 3 Jul 2001 11:37:22 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (24 lines)

Hugh Huntzinger wrote:

>My impression with light sensitivity is that some digital manufacturers
>claim an "equivalent ISO rating".  Any idea what this is for this
equipment?

Most digital camera manufacturers claim a rating near ISO 100.  There
may be several reason for this, but one is the "Sunny f/16 Rule".  This
generalized "rule", which seems to be common around the world now, allows an
easy starting place when shooting the camera in manual mode.  A proper
exposure, under sunny conditions, is usually an aperture of f/16 with a
shutter speed of the reciprical of the film speed (1/100, for example).

Another reason is optics.  On consumer grade lenses, the optics are
optimized when the aperture is set in the middle of the capable range (like
f/4.5 or f/5.6); on digital cameras, in order to capture a sharper image
and increase depth of field (DOF), this is around f/16 - thereby following
the "Sunny f/16 Rule". In reality, the ISO rating hasn't much to do with
anything on a digital camera, since they are mostly for the consumer market,
not the professional (exception being top-end cameras like the Nikon D1x and
the like).

Quinn

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