钟情APO镜的同好请看（转载）

Introduction to Maksutov Newtonian Telescopes
ITE is very pleased to offer world-class Maksutov-Newtonian Reflector telescopes from INTES and INTES-MICRO of Russia. The Maksutov-Newtonian optical technology was first developed in 1944 by Norbert J. Schell. Schell published his design for an 8-inch f/4 Mak-Newt in Scientific American. Several scopes were built by amateur astronomers using Schell's design and their owners were enthralled with their outstanding performance. Here is one case in point: In 1946, three Australian amateur astronomers built a 6-inch version of Schell's design. Here is what they said about the performance of the optic: "Remarkably small and sharp images of stars were obtained, free from coma and colour," they reported. "The image of Jupiter as a sharp as if viewed through a first-grade refractor, yet the bluish halo visible around the disc with even the best glass was entirely absent."

This design became a "sleeper" until the early 1990s. In 1993, Peter Ceravolo in Canada started the commercial production of "Mak-Newts" with his near-perfect Maksutov-Newtonian systems called the HD 145 and the HD 216. This was followed more recently by an announcement by Astrophysics/USA of their intent to produce a new 9" F/4.5 Maksutov-Newtonian (yet to hit the streets). Attendees at recent US and European Star Parties who have had the pleasure of observing the planets with the new Maksutov-Newtonians have been both surprised and pleased with the almost unbelievable results from these "combination" scopes. Cervalo's HD 145 outperformed 130 mm APO Fluorites and the HD 216 outperformed 7" APOs.

How is this possible, many amateur astronomers ask? The answer lies in the unique combination of high quality corrected optics and an unusually small central obstruction, combined with a closed tube system to prevent air turbulence. As far as the optics are concerned, it is not too difficult to produce a reflector telescope with 1/8 or even 1/10 wave p.t.v optics. But, on the other hand, it is extremely difficult to produce a similar optical quality in APO's, because of inhomogeneities in the special exotic glass materials that are used in their objective lenses.

With Maksutov-Newtonians, expect the same performance as a like aperture APO refractor at the same focal ratio, but at a fraction of the cost. Available apertures begin at 5" and currently extend to the practical limit of the technology at 16." The "optimum" aperture is an 8" Maksutov-Newtonian, with the INTES MICRO MN86 currently filling that slot. ITE now offers the Russian-made optical sets in a carbon fiber tube to keep tube weights down to respectable levels.

In summary, aperture for aperture, you simply cannot beat the Maksutov-Newtonian optical technology for superb performance and reasonable cost.

[/B] Cervalo's HD 145 outperformed 130 mm APO Fluorites and the HD 216 outperformed 7" APOs.

不好这么比的．买ＡＰＯ主要是因为它的多用途，免维护，广视角，使用便利，保值能力强，外观好等等．如果说比分辨率，买个国产８寸牛顿，把什么4寸apo，６寸马卡，都打的找不着北．

>>多用途，免维护，广视角，使用便利，保值能力强，外观好
过马路把APO的优势总结的非常到位。

最初由 过马路 发表
[B]不好这么比的．买ＡＰＯ主要是因为它的多用途，免维护，广视角，使用便利，保值能力强，外观好等等．如果说比分辨率，买个国产８寸牛顿，把什么4寸apo，６寸马卡，都打的找不着北．

高人，佩服！

INTES MICRO MN56 F/6在目视时的表现已很清楚了, 这里上两张它在深空摄影时的表现, 依次为 马头, M101, M81 及 M84+M86, 均系他人胶片作品.

马头星云.

M101

M81

M84 + M86

其实我转贴此文的目的（转自Intes Micro 网站）是想给那些追求APO镜效果，却在经济上有困难的同好提供一个参考（说实话，我从未用过APO镜和大口径牛反），4寸的优质APO镜一般要3000美元以上，不是普通国人能支付起的。还有些资料在Excelsis和Cloudy Night网站上，对这款镜子基本都是很正面的评价，如果那位同好比较过这类镜子，能否给个心得？

我自己有一台凤凰的150mm反射，一台FS-102和一台SN-10，同时也用过TOA130和C11(或是C14？记不清乐)，对火星的目视观测表明，如果想要较高倍率下有好的目视效果，只要做工别太次，口径基本上是唯一要素。

完全同意.

Ed Ting对此镜（Intes Micro 的 MN56）有一个详细评测，有兴趣者可以看以下网址：
http://www.scopereviews.com/page1h.html#2

我现在有些推崇  反射镜 了

在大多场合下单就效果来说大口径长焦比的普通折射镜子表现是相当好的，用APO的价格买个这样的镜子肯定好出许多。

如果你有车，当然是镜子口径越大越好，当然了有了车，搞个130以上的APO镜子怕是也很正常，如果没车，你家门口的天空又不是那么干净，光污染少，买个几十公斤的反射镜子，实在没啥意义。
  我的观点是用个小口径的好镜子跑远点看要比找个大口径的发射镜子在阳台或者门口看强。