[rollei_list] Re: Lens recommendation
- From: Marc James Small <marcsmall@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Mon, 09 Aug 2010 15:49:02 -0400
At 03:39 PM 8/9/2010, Richard Knoppow wrote:
> The glass in a lens is described as either _elements_
>or _components_. An element is a single piece of glass, a
>component can be either a single piece of glass or two or
>more cemented pieces, each of which is an element. A
>six-element lens has six individual lenses in it but some
>may be cemented into components.
To confuse the issue, the term "component" is
rarely encountered. Such items are much more
commonly referred to as groups, while "element"
is often referred to as simply a "lens". Thus, a
given lens would be described as being "7l/3g",
meaning seven lenses in three groups. Kingslake
and Smith seem to use element and group, while Europeans use lens and group.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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