romualdo Posted June 11, 2018 Share #1 Posted June 11, 2018 Advertisement (gone after registration) It appears the Leica made "correction lens holders" for the LTM cameras (later ones ie IIIf & g - holder enabled you to put correction lenses over the rangefinder & viewfinder windows) - I can't seem to find any pics (or codes etc) or ones for sale online & there is no mention in Laney either (I havn't been able to find anything). A thread from 2008 mentions this (see below). It's semi-mentioned in the IIIg manual. Posted 20 February 2008 - 19:38 Ray, I wear glasses, too. What I have done to solve the viewfinder problem is to get hold of an original correction lens holder for the IIIg. I then had my optician install the appropriate correction lens into the holder, and that works very fine. The original holder covers both the rangefinder and the viewfinder entrance windows at the back of the camera.Cheers,Andy Quote Link to post Share on other sites More sharing options...
Advertisement Posted June 11, 2018 Posted June 11, 2018 Hi romualdo, Take a look here Correction lens holder for IIIg. I'm sure you'll find what you were looking for!
wlaidlaw Posted June 11, 2018 Share #2 Posted June 11, 2018 (edited) Andy, Have a look at page 19 of Dennis Laney's Leica Accessory Guide (Downloadable as PDF from www.butkus.org - contributions requested) it gives an extensive table of all the accessory diopter and astigmatism correction devices, lenses and lens holders. Hove/Steyning Photo Books used to have originals of the Accessory guide but they seem to have run out. Wilson PS There was a copy for sale on eBay UK but I have just bought that as my elderly and very tatty first edition has half the pages missing. Edited June 11, 2018 by wlaidlaw 1 Quote Link to post Share on other sites More sharing options...
willeica Posted June 11, 2018 Share #3 Posted June 11, 2018 Per page 19 of Laney's accessory Guide it is Leica OKBZO for near or long sight and OKVCO for astigmatism. Bit of a discussion here. http://leica-users.org/v42/msg04674.html I suspect that it may be difficult to track these down nowadays, but it could be worth a try. William Quote Link to post Share on other sites More sharing options...
wlaidlaw Posted June 11, 2018 Share #4 Posted June 11, 2018 (edited) My father had some sort of diopter lens holder (maybe an ORTUX) on the rangefinder of his IIIa with the strongest minus diopter lens he could get in it as his left eye was very shortsighted after measles as a child. He found it quite useful in his business of textiles, as he could examine the quality and weave of cloth in perfect focus at just over an inch from his eye. People used to think he was checking that the cloth smelt correct. His right eye was much better for use on the viewfinder, with no correction needed. Wilson PS There was a Leica OKBZO sold recently at a The SaleRoom Auction in the UK. I think it went for around £40-50 from memory. Edited June 11, 2018 by wlaidlaw Quote Link to post Share on other sites More sharing options...
jc_braconi Posted June 11, 2018 Share #5 Posted June 11, 2018 I have some for IIc/IIf and IIIc/IIIf and some also for IIIg but not for sale. The ORTUX is the older Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/285471-correction-lens-holder-for-iiig/?do=findComment&comment=3535824'>More sharing options...
romualdo Posted June 11, 2018 Author Share #6 Posted June 11, 2018 (edited) I have some for IIc/IIf and IIIc/IIIf and some also for IIIg but not for sale. The ORTUX is the older So it looks (from what I can see with the "ORTUX" image above) like the holder clips over the complete Rangefinder & Viewfinder eyepiece unit and one piece of glass covers both windows/eyepieces? Is that correct? OKBZO was the holder for the IIIg or does that refer to the glass/lens only? I wasn't looking to buy but was just interested in how the mechanism functions & fits over/attaches to the eyepieces Any pics would be greatly appreciated Thanks for the info so far Edited June 11, 2018 by romualdo Quote Link to post Share on other sites More sharing options...
alan mcfall Posted June 11, 2018 Share #7 Posted June 11, 2018 Advertisement (gone after registration) Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Neat clip attaches to small grooves on side of black viewfinder/rangefinder window/eyepiece. 2 Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! Neat clip attaches to small grooves on side of black viewfinder/rangefinder window/eyepiece. ' data-webShareUrl='https://www.l-camera-forum.com/topic/285471-correction-lens-holder-for-iiig/?do=findComment&comment=3535908'>More sharing options...
romualdo Posted June 12, 2018 Author Share #8 Posted June 12, 2018 (edited) IMG_0595.jpgIMG_0596.jpg Neat clip attaches to small grooves on side of black viewfinder/rangefinder window/eyepiece. Thanks Alan Very groovy!! as I thought - was the corrected glass/optics already part of the unit or did that have to be fitted by an optician once your optical formula was determined? Was this attachment called OKBZO? What was the situation for models prior to the IIIb where the eyepieces were some distance apart? Edited June 12, 2018 by romualdo Quote Link to post Share on other sites More sharing options...
wizard Posted June 12, 2018 Share #9 Posted June 12, 2018 (edited) ...was the corrected glass/optics already part of the unit or did that have to be fitted by an optician once your optical formula was determined? ... As indicated in my post from 2008 (Jesus, that is already 10 years ago), the unit could be bought separately (I do not know whether Leitz also sold units including the required lens) and your optician could make and install the required correction lens. Andy Edited June 12, 2018 by wizard 1 Quote Link to post Share on other sites More sharing options...
jc_braconi Posted June 12, 2018 Share #10 Posted June 12, 2018 Extract from the leica accesory guide : Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! 1 Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/285471-correction-lens-holder-for-iiig/?do=findComment&comment=3536253'>More sharing options...
alan mcfall Posted June 12, 2018 Share #11 Posted June 12, 2018 Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Just a guess, but if Leitz installed the glass they may have marked the correctiom value on on the mount, such as these later units for the reflex. If the glass was installed by a local optician, then it is likely unmarked as to the correcton value. 1 Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! Just a guess, but if Leitz installed the glass they may have marked the correctiom value on on the mount, such as these later units for the reflex. If the glass was installed by a local optician, then it is likely unmarked as to the correcton value. ' data-webShareUrl='https://www.l-camera-forum.com/topic/285471-correction-lens-holder-for-iiig/?do=findComment&comment=3536256'>More sharing options...
romualdo Posted June 12, 2018 Author Share #12 Posted June 12, 2018 (edited) Extact from the leica accesory guide : So these codes must refer to the glass (+/- attachment) rather than the attachment per se eg. for the IIIg we have OKBZO (14064): near or long sighted vs OKVCO (14066): Astigmatism - why have two different codes for the same attachment device? Must be referring to the glass. It doesn't appear that the slip on attachment by itself (without glass) had a separate code. Alan would you be able to take pics of the IIIg attachment & the IIIb-IIIf version side by side (if you have both). Thanks all for the input Edited June 12, 2018 by romualdo Quote Link to post Share on other sites More sharing options...
romualdo Posted June 12, 2018 Author Share #13 Posted June 12, 2018 As indicated in my post from 2008 (Jesus, that is already 10 years ago), the unit could be bought separately (I do not know whether Leitz also sold units including the required lens) and your optician could make and install the required correction lens. Andy Yep, doesn't time fly!! Quote Link to post Share on other sites More sharing options...
alan mcfall Posted June 13, 2018 Share #14 Posted June 13, 2018 The OKBZO (IIIG) is 3mm larger than the OPRTO (IIIb-IIIf). I only have the latter, Lager's Accessorys book shows most all of them, including OQZIO for the 5x "chimney" viewer. 1 Quote Link to post Share on other sites More sharing options...
Jon Pop Posted June 14, 2018 Share #15 Posted June 14, 2018 DAG camera has had the diopter lens holders for the iiif etc. on occasion; you might want to check with him. 1 Quote Link to post Share on other sites More sharing options...
romualdo Posted June 14, 2018 Author Share #16 Posted June 14, 2018 DAG camera has had the diopter lens holders for the iiif etc. on occasion; you might want to check with him. just saw them today in his Leica screwmount section whilst browsing Quote Link to post Share on other sites More sharing options...
mikemgb Posted June 14, 2018 Share #17 Posted June 14, 2018 Thanks Alan Very groovy!! as I thought - was the corrected glass/optics already part of the unit or did that have to be fitted by an optician once your optical formula was determined? Was this attachment called OKBZO? What was the situation for models prior to the IIIb where the eyepieces were some distance apart? The III and IIIa had an adjustable diopter built into the rangefinder, somebody else may know of an attachment available for the viewfinder. Quote Link to post Share on other sites More sharing options...
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