Most are achromats on the order of f/6 - quite fast for a telescope objective. Generally operating at 7x to 20x doesn't stress the achro too much. Manufacturing costs are kept lower by not trying to make the bino objective to a full resolution telescope quality. Now an exception to thi...
B (RB), we use a telescope with a refractive lens L2 (focal length f2 100 =) mm and a 20X microscope objective MO1 with focal distance 10 mm. ... J Pérez-Vizcaíno,O Mendoza-Yero,G Mínguez-Vega,... - Lasers & Electro-optics Europe 被引量: 0发表: 2013年 An Update of the US...