Can mg filters be used on a lens in place of red filter. I cannnot at this time afford 77mm filters for my mf systems and wonder what I could achieve with mg filters I have for enlarging. Will they work at all? I have as hasseelblad and a rz67 so I want to get an adapter b60 to 77mm so my filters are standard but have no money to purchase filters at this time. Also are the cheap eBay filters going to hamper sharpness or resolution very much.