Kudos to http://www.scantips.com/lights/cropfactor.html for explaining that there are exactly no loss of megapixels between a DX and a FX format lens given that the image in FX is resized to the same size as that of a DX. What it really means to me is that I do not have to retire my DX lens but instead capitalise on the 1.5 crop factor in the DX telephoto lens and get more closer to the subject. All this while I have mistakenly assumed that a DX lens gives less megapixels.
