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Condenser vs Diffuser

Diffuser for 135, 120 and 6x9. Condenser for 4'x5'. Main format 120.
 
Ralph,

If you put your hand on the head while the fan is running, do you feel a slight vibration?

Best,

Cor

Yes, I do. Do this, insert a negative and rack the enlarger to the top. Put a grain focuser on the easel and look at the projected image. Do you see any vibration?
 
Good idea, Ralph..I'll give it a try next time I swap heads, thanks,

Cor
 
Beseler 45mcrx with condensor head, but am assembling the bits to change to a Zone VI cold light head (not VC)

main format: 4x5
I also do 6x6, and 4x10 contact printing