Sorry if this question seems stupid ... A few months ago I bought a bunch of darkroom gear for putting together a darkroom and I am finally getting to it. One of the pieces was an Omega 4x5 variable condenser enlarger: Here's a picture My questions are: Which model is this? The reason I am asking is that it appears I have to buy some kind of lens board or mounting plate to mount lenses in what I guess are the cones, and I am not sure what I need to buy online. Thanks in advance for any help!!