6 cm tall. Using 3.5cm alu square BLDC motor： 27mm外转子高速无刷电机，BL2717无刷电机，稀土中强磁外转子，带动平衡矫正，双滚珠轴承，电机标称电压14.4V，最大功率约30W，峰值最大电流2.8A，电机支持正反转/PWN信号调速/急停/信号反馈FG输出。電壓範圍 7 - 14V 电机内置驱动电路，支持PWM信号无极调速，14V电压测试空载转速PWM信号调节约100-10000转。 Now set at 9V. PWM board:
Using focal length of 100mm f/2 as example Double gauss: Double gauss performance: Sonnar performance: Datasheet of sonnar f/4 13.5 cm Zeissikonveb : If you look at the data sheet above, you will be amazed: no heavy or even very heavy crown is needed, no barite flint or similar "exotic" glasses. The two front convex lenses are made of simple boron crown BK7 - one of the cheapest crown glasses that can be produced in large quantities. However, it has decisive advantages if you do not need particularly high refractive indices: it only splits the light into its primary colors to a small extent, which makes chromatic correction easier. Since the 1890s, it had become the standard material for prisms due to its high transparency and, due to its low thermal expansion, it was also often used as a base for mirrors. Only the subsequent flint glass F9 was relatively new in the glass catalog. The result is barely perceptible spherical zones and a practically completely flat image field