On the subject of "how many enlargers"...
There are a few reasons to use more than one.
1. Smaller enlargers can be better suited to smaller formats. That being said, I happily use my 4x5 enlarger for 135, although it works better with a 60mm lens than a 50mm lens.
2. If you are planning to do both colour and black and white, you might prefer a colour head for one and another light source for black and white. That being said, many people (including myself in the past) have used colour heads very successfully with variable contrast black and white printing.
3. A second light source in a darkroom can be very useful for flashing paper, and for a standardized contact proofing procedure. It can also be useful for more complex procedures, like combining multiple images in the same print.
Of course, a second enlarger makes it easy for two people to print at the same time.
I have my old 6x7 enlarger in storage still, because I hope to some day have the space to use it beside my current 4x5 enlarger, and because it has a colour head.
There are a few reasons to use more than one.
1. Smaller enlargers can be better suited to smaller formats. That being said, I happily use my 4x5 enlarger for 135, although it works better with a 60mm lens than a 50mm lens.
2. If you are planning to do both colour and black and white, you might prefer a colour head for one and another light source for black and white. That being said, many people (including myself in the past) have used colour heads very successfully with variable contrast black and white printing.
3. A second light source in a darkroom can be very useful for flashing paper, and for a standardized contact proofing procedure. It can also be useful for more complex procedures, like combining multiple images in the same print.
Of course, a second enlarger makes it easy for two people to print at the same time.
I have my old 6x7 enlarger in storage still, because I hope to some day have the space to use it beside my current 4x5 enlarger, and because it has a colour head.