Condenser aperture-A little laser-bored hole in the flat strip of molybdenum positioned near the condenser lens that can help to Restrict spherical aberration.L?i ích c?a tem v? ??i v?i doanh nghi?p r?t l?n. T? th?c t? chúng tôi ghi nh?n m?t s? giá tr? thi?t th?c nh?t khi doanh nghi?p s? d?ng d?ch v? in tem v? l?y nhanh, nh? sau:The theoretical