Dave, Many thanks again for a brilliant day last Saturday. Got home at 8.30 and relieved I did not have to attend the bowls club social as Christine was at least as tired as myself! I had a flash of inspiration about the lost negatives and found them where I guessed, still held in the contact printing box where last used. I wonder if you can comment on my enlarger, as I recalled it is indeed a Durst F30 with 75 watt bulb, (can take 150), condenser lens and F 4.5 x 50 mm Minolta lens. I have attached a few pics. The negative tray looks straightforward. The condenser lens is removable and it looks like there is provision for a filter above it in the holder. Does this make sense? The filter would be 65 mm square to fit. i.e. your style of filters with the projecting handle would not fit. Saw some filters like yours on eBay( new, £55) but looks like I need to research further options. Very best regards to Jan and thanks again to her for a tasty and attractive lunch. Regards”,