... other super achromatic refractor telescope:5inch,D=127mm,f=635mm,other objective size of achromatic refractor ... f=1200mm,6inch,D=152mm,f=990mm,5inch,D=127mm,f=1200mm,5inch,D=127mm,f=820mm,4inch,D=102mm,f=1000mm ... ,4inch,D=102mm,f= ... 660mm.other ED APO refractor telescope:3.15inch,D=80mm,f=480mm, ...