hi everyone, I'm very new about darkroom printing. I just bought Beseller 23c iii XL from ebay last week. I have some issues 1. switching filtration to white light, I can not turned it all the way down to filtration's sign it struck at the half. which is common? 2. When I turned to white light mode, the light became to color!! So I can change any color. But when I turned it back to filtration (the pice can not go all the way point to the filtration sign) the result is white light come out which is like filter retraction . Are the machine common? Thank you all for replying.