APO?
Feb 3, 2021 11:53:01 #
TRSquared wrote:
The term apochromatic is applied to an optic that brings 3 different wavelengths of light (colors) to the same focus as opposed to only 2 wavelengths for achromatic optics. With this design approach, the focus vs. wavelength plot can bed made nearly flat across the visible range of colors, thereby reducing chromatic aberration to a minimum. This result is something that is not possible with an achromatic design.
Give this man a cigar. In astronomy, an APO is an apochromatic telescope.
Feb 3, 2021 12:16:07 #
rmalarz wrote:
"APO" stands for "Army Post Office". It is normally followed by a number which serves as a code for a particular military unit or installation. ... Military addresses must show the grade, full name with middle name or initial, and PSC number, unit number, or ship name.
--Bob
--Bob
I knew Army post Office was gonna come up
Feb 3, 2021 12:16:50 #
ecobin wrote:
APO stands for After Pandemic Opportunity
That's a good one.
Feb 3, 2021 13:58:21 #
Feb 3, 2021 17:55:21 #
Of course in regard to optics such as lenses APO refers to Apochromatic. It also stands for "Very Expensive" as one can see when comparing a more typical lens to that of one that is of APO design.
For example, I use microscope objectives as the lens for my camera when I do micro photography and the cost of a new 10X achromatic Plan Infinity microscope objective is less than $50. A new 10X APO Plan Infinity microscope objective is between $800 to $1000.
Anyone that is offering an APO lens in the same price range as a standard lens should be viewed very carefully for it may be APO in marketing terms only.
For example, I use microscope objectives as the lens for my camera when I do micro photography and the cost of a new 10X achromatic Plan Infinity microscope objective is less than $50. A new 10X APO Plan Infinity microscope objective is between $800 to $1000.
Anyone that is offering an APO lens in the same price range as a standard lens should be viewed very carefully for it may be APO in marketing terms only.
Feb 3, 2021 21:45:18 #
DVZ
Loc: Littleton CO
With modern very low dispersion glass and grown fluorite elements an apo telescope can be designed with only two glass elements.
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