The ZENITH UPA 5 enlarger was a very popular piece of equipment as it folded away into a case, and so was ideal for photographers without a permanent darkroom. This adaptor allows standard M39 enlarging lenses to be used. It has an internal and external M39 thread, an effective length of 17.5mm. It has 10mm of external male thread. Apart from its intended use, it can provide a mounting solution for several DIY projects.
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