Luminous Landscape Forum

Equipment & Techniques => Digital Cameras & Shooting Techniques => Topic started by: Edalongthepacific on February 11, 2011, 08:15:33 pm

Title: Simple Digital Camera Question
Post by: Edalongthepacific on February 11, 2011, 08:15:33 pm

Most recent digital cameras select automatic exposure from a range of available f-stops and shutter speeds (leaving ISO out for a moment). What fractional increments of aperture and shutter speed does a digital camera employ when selecting automatic exposure?

Title: Re: Simple Digital Camera Question
Post by: elf on February 12, 2011, 03:46:06 am

1/8th

Title: Re: Simple Digital Camera Question
Post by: stamper on February 12, 2011, 04:00:42 am

1/8th? Are you sure? All of them? ???

Title: Re: Simple Digital Camera Question
Post by: uaiomex on February 12, 2011, 01:10:31 pm

If I understand the OP question well, I think it is 1/3 of an fStop. In Canon all apertures and shutter speeds are modified in 1/3 increments. You can change that to 1/2 increments if you desire.
Ed

Title: Re: Simple Digital Camera Question
Post by: Plekto on February 12, 2011, 03:34:01 pm

It depends on the manufacturer. 

Title: Re: Simple Digital Camera Question
Post by: LKaven on February 13, 2011, 03:28:58 pm

For Nikon, this is also selectable in terms of 1/2 or 1/3 stop increments.

In the Nikon, all ISO settings, including intermediate settings correspond to analog gain settings.  In some Canon models, intermediate ISO settings involve nearest-analog setting plus digital +-gain.

Title: Re: Simple Digital Camera Question
Post by: stamper on February 17, 2011, 06:55:52 am

Quote Wikipedia.

Modern electronically-controlled interchangeable lenses, such as those from Canon and Sigma for SLR cameras, have f-stops specified internally in 1/8-stop increments, so the cameras' 1/3-stop settings are approximated by the nearest 1/8-stop setting in the lens.

Unquote.