The lens you have might be a so called "Wundertüte" (lucky bag) after a review of the German magazine Color Foto. These lenses were mostly made by Cosina and showed excellent optical performance while having mediocre mechanical stability. I own the 500/8.0. The challenge is the correct focusing. http://de.wikipedia.org/wiki/Beroflex http://www.siliconinvestor.com/readmsgs.aspx?subjectid=52350&msgnum=14608&batchsize=10&batchtype=Previous https://translate.google.com/translate?depth=1&hl=de&rurl=translate.google.de&sl=de&tl=en&u=http://www.bilderforum.de/t4985-beroflex-500mm-f-8-0-wundertuete-der-test-72er-ausfuehrung-gegen-67er.html http://www.bilderforum.de/t4985-beroflex-500mm-f-8-0-wundertuete-der-test-72er-ausfuehrung-gegen-67er.html http://www.digicamclub.de/showthread.php?t=16570 Telephoto lens "grab bag" It was cheaper in price, but surprisingly good performance: the legendary Tele of Beroflex. When Walter E. Schön 1980, the trade magazine Color photo as has often published a report, he did not know that he almost thereby founding a myth. He wrote in his conclusion: "The Beroflex lens is characterized by a price-performance ratio, achieved by no other objective of the test even close. It is compared to the Spiegellinsern Although a long bag ', but in terms of its image quality and considering the cheap price it deserved rather the name, piñata'. " In the test the time were very expensive Leica Telyt-R 6.8 / 560 mm, the Novoflex Noflexar 8/600 mm, the bright Pentax SMC 4.5 / 500 mm and compared to dirt-cheap Beroflex 8/500 mm. It then cost around 200 marks, while the price of the competitors went into the thousands. There is a rumor that the "piñata" was also tested only for fun, but then unexpectedly not so bad sections. Identical from other manufacturers The positive test result, the company did indeed own. Walter E. Schön: "The company Beroflex then has for years cited that last sentence from my test in their advertising for this lens, so this lens under the name, piñata 'become popular." So-called Wundertüten there was the same design from other manufacturers. Lenses of this type are not particularly bright and very long. But their image quality was attracted. (asa) Dirk Gesendet: Mittwoch, 28. Januar 2015 13:32 An: rollei_list@xxxxxxxxxxxxx Betreff: [rollei_list] Rolleiflex SL 35 E and birds in the wild Last month I bought a tele lens 6,3/400mm from the '60s-'70s made in Japan, its commercial brand is according the importer: Hanimex, Soligor, Vivitar and others; mine is "Hanimex", an importer from Australia; it has M42 mount and then my topic about the Rollei M42- QBM adapter. This tele lens is long like a canyon and heavy. It has a ring with a tripod socket but I used it camera hand-held (not recommended, it requires a tripod). I was only checking it for the first time, I had a Kodak Pro-image ISO 100 loaded in the Rolleiflex SL 35 E (the tele lens requires an ISO 400 film at least). You need 1/500 or faster shutter speed to eliminate camera movement in the image; if you are using an ISO 100 film, you are limited to the lens f stop full aperture, f 6,3, for subjects in shadow. I took these two photographs about birds in the wild last week- end in the farm; they were taken with the Hanimex 6,3/400mm, camera hand-held, lens wide open f6,3, 1/500 shutter speed, Kodak Pro-Image ISO 100 color negative film, and the Rolleiflex SL 35 E with the Rollei M42 adapter, It's not easy to take photographs about birds in the wild, I'm starting to learn: https://www.flickr.com/photos/itarfoto/16386867475/ https://www.flickr.com/photos/itarfoto/16199455170/ Carlos