I will keep a lookout for that 90mm lens. I had acquired a older Schneider 80mm lens in a 25mm mount when I bought my used 4x5 enlarger but it was in a box of miscellany. So by chance I found a 25-39mm plastic adapter for $10 which worked perfectly. The older lens worked quite well, but I already had a more recent 80mm. I should be able to use that same adapter for that 90mm.