can someone put these two things into easy to understand?

[Helen B]

The standard that defines digital ISO was intended to give results that more-or-less match film of the same ISO in terms of exposure, while allowing camera manufacturers some discretion.

The normal digital ISO is based on the exposure required to saturate the sensor (produce the maximum electrical signal it is capable of) with around half a stop of headroom (ie it is based on the safe highlight exposure). Negative film ISO is based on the minium exposure required to give shadow detail and reversal ("slide") film exposure is based on midtone exposure (all explanations highly simplified).

Manufacturers may also give recommended ISO values based on grey card exposure, but they should not always call these ISO values - they should call them EI (Exposure Index). If you see a reference to EI it is numerically the same as ISO, just not defined by a standard.

Best,
Helen

 

[Derrel]

OP,
You're probably too young to have read the personals much....nowadays people your age hook up via text messaging and Myspace....but ISO has long,long stood for In Search Of, as in, "SWM ISO awesome, attractive, funny,pretty SWF with new d-slr camera. Complete lens system and non-smokers considered a bonus."

"Marco" is a code word for a good-looking Italian man....used mosty by SWF's (single white female) in search of good-looking Italian or Italian-American boyfriends, as in, "Attractive SWF seeks polite,well-dressed Marco for good relationship, travel,etc. Please reply with pics."

 

[mpasq66]

lol

 

[Dwig]

"Macro", as a piece of photographic jargon, does not have a good, fixed, consistent definition. It evolved out of a well defined technical term, but is abused massively in general use. As a result, you'll not find a clear definition. In general it mean "very closeup photography".

There are four technical terms that sound similar but have distinct definitions:

Photomacrography - photography are 1:1 magnification and greater, generally up to about 10x.

Photomicrography - photography through an optical microscope, generally at at least 10x magnification.

Macrophotography - the making of large prints (e.g. billboards).

Microphotography - the making of very, very small prints (e.g. reducing a circuit diagram to "print" an integrated circuit).

Its the first term, above, that gets bastardized into "macro", though its frequently used referring to images made at noticably less than 1:1 (aka "lifesize") magnification. Such less than lifesize magnifications are properly referred to as "closeup photography" and not "macro".