rupa_sztraka1 Posted July 14, 2021 Share Posted July 14, 2021 Hi, i pulled apart the rear group of elements on my 50mm ULD to clean severe fungus growth. Stupidly i cant remember the order the elements go back together & its not very self explanatory as in the group can go back together many different ways. I need a diagram showing what order & orientation each element goes back together but nowhere on the net is there a diagram of any kind. Any advice appreciated! Thanks. Link to comment Share on other sites More sharing options...
rupa_sztraka1 Posted July 14, 2021 Author Share Posted July 14, 2021 (edited) I need something like this but for 50mm ULD Does anybody have access to the Repair Manual for Sekor Z lenses that can send me a Photo or Scan? Edited July 14, 2021 by rupa_sztraka|1 Link to comment Share on other sites More sharing options...
kmac Posted July 15, 2021 Share Posted July 15, 2021 Someone may know, but perhaps the quickest way to find out would be to reassemble the lens, attach it to the camera and note any softness/blurriness. The danger in this though is that if any elements are the wrong way around, they could bind on something and prevent final tightening. The front and rear elements should be self-explanatory while the middle elements might be the ones that need some trial and error. Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted July 17, 2021 Share Posted July 17, 2021 This link might help. If you scroll to the bottom of the RZ lenses manual, you'll find optical diagrams next to the lenses pictured. Don't forget to donate to Mr Butkus if it answers your question. 1 Link to comment Share on other sites More sharing options...
kmac Posted July 18, 2021 Share Posted July 18, 2021 This link might help. If you scroll to the bottom of the RZ lenses manual, you'll find optical diagrams next to the lenses pictured. Don't forget to donate to Mr Butkus if it answers your question. Good find. I think this is the lens: ⓶ Z 50mm f4.5W .... in this manual .... ⬇ https://www.cameramanuals.org/mamiya_pdf/mamiya_rz67_interchangeable_lenses.pdf .... scroll 3/4 the way down Unfortunately the diagram of the lens construction is quite small, but zooming in helps a little to see it better. Link to comment Share on other sites More sharing options...
rupa_sztraka1 Posted July 19, 2021 Author Share Posted July 19, 2021 Thanks for that info & links. Unfortunately the only 50mm lens in that manual has a different lens construction than what i have. My lens the "ULD" has an adjustable floating element. I am very confused as i have tried assembling the lens almost every possible way that makes any sense but when i put it on the camera & view through it the image is full of halos & soft focus areas is the best way to describe it. Is it possible that when i was cleaning the elements i rubbed off some special coating or something? :( Link to comment Share on other sites More sharing options...
rupa_sztraka1 Posted July 19, 2021 Author Share Posted July 19, 2021 I might have to consider sourcing & purchasing the physical copy of the Sekor-Z Lenses repair manual which would be much more detailed diagrams etc... As there seems to be no digital version anywhere on the net that i have looked for. Like this: Mamiya-Sekor Z Lenses f/ Mamiya RZ67 Service, Repair & Parts Manual Reprint | eBay Link to comment Share on other sites More sharing options...
kmac Posted July 19, 2021 Share Posted July 19, 2021 Thanks for that info & links. Unfortunately the only 50mm lens in that manual has a different lens construction than what i have. My lens the "ULD" has an adjustable floating element. I am very confused as i have tried assembling the lens almost every possible way that makes any sense but when i put it on the camera & view through it the image is full of halos & soft focus areas is the best way to describe it. Is it possible that when i was cleaning the elements i rubbed off some special coating or something? :( Try this link for the floating element 50mm lens. The lens construction is much clearer .... https://www.cameramanuals.org/mamiya_pdf/mamiya_rb_lenses.pdf You may have disturbed the accuracy of the floating ring adjusting mechanism, that's the only thing I can think of just off hand. That floating element may have to be synchronized properly with the focusing elements to attain sharp focusing when using that 50mm lens. Link to comment Share on other sites More sharing options...
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