2024年1月27日 · 借此机会说一下m42、m39、m43、43的区别。 M42诞生于1949年，基本上都指的M42×1这个标准，既42mm直径，1mm螺距（这个需要特地指出因为T口也是42mm直径，但是0.75mm螺距）。

2025年1月15日 · Messier 43 is a neighbor to Messier 42, the Orion Nebula. Separated from the Orion Nebula (M42) by only a dark lane of dust, M43 was recognized as a distinct nebula by the French astronomer Jean-Jacques d’Ortous de Mairan in 1731. A massive star is illuminating M43 and sculpting its landscape of dust and gas with its radiation.

2019年11月21日 · Both M42 and M43 are emission nebulae, with their light emitted from atoms being excited by the high-energy radiation of massive, very hot young stars within them. Wisps of the Orion Molecular Cloud in the neighborhood of M42 and M43 constitute the fainter reflection nebulae elements.

Messier 43 or M43, also known as De Mairan's Nebula and NGC 1982, is a star-forming nebula with a prominent H II region in the equatorial constellation of Orion. It was discovered by the French scientist Jean-Jacques d'Ortous de Mairan some time before 1731, [3] then catalogued by Charles Messier in 1769.

The Great Orion Nebula, comprised of M42 and M43, with the Trapezium near the center. Because of its high dynamic range, the Great Orion Nebula is difficult to capture with a single exposure duration.

M42 and M43 are best seen during the winter months from November through to February. Difficulty. The Orion Nebula is one of the brightest emission nebulae in the night sky, second only to the far-southern object NGC 3372, the Eta Carinae Nebula. At a declination of -5 degrees, M42 is well-placed for observers in both hemispheres.

2019年9月11日 · M43是Micro Four Thirds的缩写，其实应该写作M4/3，也就是微型的4/3系统规格，这是在4/3相机系统(Four Thirds系统，现在也被称为大43系统)上扩展演化出来的，由奥林巴斯提出，主要是为了将4/3系统小巧的优势进一步发挥出来。因此在传感器设计规格不变的前提下，缩短 ...

2024年10月2日 · 高速钢m35、m42、4341和6542在成分和性能上有所不同，以下是对它们的区别的详细说明： 1. m35高速钢： m35高速钢含有5%的钨、5%的钼、3%的钴和1.5%的钒。它以其较高的硬度和耐磨性而著称，特别适用于加工难加工的材料，如不锈钢、镍合金和钛合金。

从08年松下奥巴等厂商联合制定M43标准，发布G1开始，M43阵营就拉开了相机无反化的大幕。 当时，大43系统已经基本被市场认定是奥巴松下的弃子，退出了大43阵营松下也走出了阴霾，在新的M43系统中迎来自己的一片新天地。 而如今，M43系统在无反里毫无疑问是一个不可忽视的主要阵营，各大论坛上都有世界各地的摄影师用M43系统的机器。 先说说大43是怎么没的——垂直入射和小底的悖论. 垂直入射是什么呢？ 胶片和cmos，ccd等原件不同，ccd和cmos等电子原件反 …

2006年2月10日 · M43 is a comma-shaped nebula surrounding a 7th magnitude star. The star is 8' north and a skosh east of the Trapezium, the four pack at the heart of M42. Both M42 and M43 are part of the same emission nebula but appear separated due to a dark foreground nebula.