I have a Durst M700 B&W enlarger, which can handle up to 6x9cm negatives, but I only have the Unicon 50 condenser (for 35mm format), and want to be able to also print 6x6cm format. Ideally, there are Unicon 85 and Unicon 105 condensers, which, I believe, will both be suitable for 6x6. Recently, I also saw some Durst boxes titled Setobox 69 and Setobox 66, which fit the M700 and look just like condensers, but, somehow, I think that these are to be used for colour printing - is this right? Are the Setobox boxes also usable for B&W, perhaps (I have no plans to start printing colour)? Thanks for any feedback.