What does apo mean? Let’s take a look. Below is what I have compiled for you what apo means, for your reference!

What does apo mean?

APO is the abbreviation of Alternative Public Offering, which refers to the completion of overseas special purpose companies with the United States At the same time as the shell company's reverse takeover transaction (shell listing) in the OTCBB market, it can also achieve targeted fundraising from international investors. Through this indirect method, private companies ultimately sell company shares to public investors in the stock market. apo in the commercial field

APO is a new, complex financial transaction model that was born in the United States in recent years and has gradually matured. It mainly targets the potential gap between the U.S. capital market and the financing needs of Chinese private enterprises. business opportunities, and creatively seamlessly connect the two capital market businesses of private equity financing and reverse takeovers. It completed a reverse takeover transaction with a U.S. OTCBB market shell company while an overseas special purpose company raised funds from international investors. This is an indirect way for a private company to ultimately sell its shares to public investors in the stock market. At present, the American Walter Financial Group has registered APO as a service trademark.

APO translated into Chinese is financing reverse takeover. Financing-type reverse takeover is a financing procedure between IPO and private equity. It has the characteristics of both private equity and IPO. The private equity procedure is characterized by low cost and speed, so it only takes three to four months to complete the financing; APO At the same time, it has the characteristics of a public offering. The stocks that investors obtain when investing are the stocks of listed companies. It is precisely because the investor obtains liquid and negotiated stocks at the time of investment that he can withstand higher prices. apo telescope field

It is the abbreviation of English Apochromatic, which means "apochromatic". Apochromatic lenses refer to lenses that can eliminate chromatic aberration for multiple colors of light (more than two). Used in the manufacture of precision optical instruments such as telescopes. Fluorite lenses, AD glass, UD glass, and ED glass are mostly used as materials.

APO apochromat uses 3 or more lenses designed to produce 3 colors of light can converge to the same point. Two lenses cannot achieve the APO design purpose. Super-APO, which is super achromatic, is designed so that 4 colors of light converge to the same point. Semi-APO is a semi-apochromat. On the basis of ordinary achromatic convergence of two colors of light, special low-dispersion optical materials such as artificial fluorite or ED glass are used to reduce the dispersion of other colors of light.

Highest level

Most of the APO mirrors at this level are high-end APO composed of 3 pieces of glass or more. For this kind of mirror manufacturers generally do not hesitate to use high-end materials. Investment, especially in the field of partial photography, involves a lot of optical correction.

From the perspective of visual performance, under high-power visual inspection of this kind of mirror, not only can no chromatic aberration be seen inside the focus, but the dispersion outside the focus is also extremely weak.

Among the world's top refractor manufacturers, the representative models of this kind of mirror include Takahashi FSQ-106ED, Pentax 125SDF (4-piece Pitzval glass structure), APM-TMB 130/1200 (super planetary telescope), Astro-Physics 130/800, 130/1040, TEC 140/980, Carl Zeiss APQ 100/1000, etc.

Standard type

Most APO mirrors of this level are 2 pieces Made of glass, but all contain high-grade low-dispersion glass materials such as fluorite or SD glass.

Visual performance: at high magnification, there is no inner focus dispersion, or at extremely high (excess, at least 3X/per millimeter aperture) magnification it is very weak, and outer focus dispersion can be seen.

The representative types of this kind of mirror are FC-76 and FS-102. They are both made of two pieces of glass, including fluorite lenses; including the domestically produced Cinda? Black Diamond? series and so on.

Although the structure of higher-level APO is simple, the 2-piece APO can also perform at a high level at 3 times the caliber and millimeters. There are domestic enthusiasts who can clearly see it at 240 times at 76mm caliber. Jupiter's stripes detail.

Quasi-APO type

This model is not the usual Semi-APO model, but a grade of APO mirror such as Borg 77ED, 101ED, ??etc., most of which have 2X/mm aperture Optical performance with minimal (equivalent to no) intra-focus dispersion. Semi-APO, mirrors from the TS period of Japan's Takahashi Manufacturing Co., Ltd. fall into this type, such as TS-65. Currently, this type of APO is gradually fading out of the production line.