Having bought the Fujimoto 450 M enlarger (see this Forum), it is beautiful. But I'm having a problem. My exposures in printing are far too short. I am stopped down on the enlarging lens to f.11. I am using a enlarging lens 80 mm lens. I am using Agfa Multicontrast paper. My developer is Dektol 1:2. Yet still, I cannot expose for more than 5 seconds (f.11) without having a black print (extreme overexposure in the enlarging). I have not replaced the lamp that comes with the enlarger or tinkered with it in any other way. This is a dichroic, dedicated VD enlarger. http://www.jobo-usa.com/products/fuji450mm.htm The light source is a 250W Halogen bulb. Any ideas or suggestions? But wait...I come back to edit this post....I've fiirgured this out!! Wrong diffusion chamber! The enlarger came with the 4x5 chamber and the salesperson told me that's all I needed, but he was wrong....there IS a medium format chamber as an accessory.