I just bought an Omega 4x5 XL enlarger that is like new. It is a complete package with lenses, contrast filters, timer etc. I already had a 6x7 enlarger with a 50mm lens and a 90mm lens. Now I have 2-50's, 80mm, 90mm, 105mm and a 135mm. The 50 is for 35mm, I have been using the 90mm for my 6x7 negatives and the 135 is for my 4x5. What about the 80 and 105? What is their strong suit? Obviously I am trying to decide what to keep and what to sell/trade.