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km6xz

St Petersburg, RU
3559 posts

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"RE: Why L 0.3, 0.7 1.0?"

km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009
Fri 04-Jan-13 01:46 PM

ISO is a standard organization that sets the specifications for method of measuring the parameter. The manufacturers subscribe to the standard by paying significant licensing fees so it is not public domain. We really do not know the testing conditions or criteria but it represents a minimum signal to noise ratio before the value can be designated a ISO value. Why the low sensitivity levels are designated "L" certainly is not due to poor signal to noise ratio, but the "H" values are those that fail to meet the minimum level. L01 is essentially the same DR as base 100, the failing to meet the standard indicates that there is a factor of ISO number or gain that is considered. You are safe shooting below 100 ISO but you do not gain in signal to noise ratio, but use it if there is a benefit such as being able to get narrower DOF in brighter conditions.
It is clear that the self testing that manufacturers do is influenced by marketing departments, since an ISO 25k between Sony, Nikon and Canon sure look different. I remember when the 1DIV came out and Canon was bragging how they had a world beater at 102k. Any one who looked at their 102k and the Nikon D3s 102k could see they were talking apples and oranges.
Stan
St Petersburg Russia

Visit my Nikonians gallery.

A general, generic topic Why L 0.3, 0.7 1.0? [View all] , four eighty sparky , Thu 03-Jan-13 12:53 PM
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