I bought a used Omega D3 enlarger with Dichroic head. It came with assorted carr iers. Will I need a glass carrier for 4 x 5 negs with this head? Are carriers av ailable for the omega available similar to the Negaflat carriers for the beseler ? I have the Schneider 150mm Componon lens, would like to make 16 x 20 enlargeme nts. Thanks Chet