The model DCR-1542PRO/DCR-1541PRO high definition telephoto lens is made of the high index optical glass elements with new concept of lens designing using two-group/four-element lens formulae. This new concept in designing the lens made it possible to achieve an amazing high definition telephoto lens of the 340 lines/mm resolution power at center (MTF30%), low dispersion and the increased light transmittance at fringe area.This is an ideal Telephoto conversion lens for the High Definition camera with 25x or more optical zoom lens.By using a suitable adapter and/or holder, the DCR-1542PRO/DCR-1541PRO lens can be used with the appropriate digital still camera or HD video camcorder, effectively.