It could be found under export names: Revueflex-B, Kalimar SR100, Phokina, Prinzflex 500, Meprozenit-Pro, Cambron-B, Global. As with the Zenit E, a small number of B cameras were made in M39 screw mount.Īll Zenit-B produced between 1968-73 with quantity of 889.617 units. Mostly available in a chrome-topped design, there were also some all-black models. There were also no focusing aids apart from the plain ground-glass screen. Like the E, it had no automatic diaphragm the lens had to be stopped down manually after focusing. The Zenit-B was a purely mechanical 35mm SLR similar to the Zenit E but without the light meter. Zenit means Zenith, a point in the sky that appears directly above the observer. Problem solved.The Zenit-B (ЗЕНИТ-B) was one of a long series of M42 screw mount Zenit cameras from KMZ. My M4/3 white balance did not require this treatment…I was more concerned with the slowing down of a fast spec’d lens(by up to 1 full stop) due to the yellowing. Was unsure of the lack of UV from the LED would be a problem…it wasn’t. I found this approach within multiple sites on the web. Good news, LED does not emit much heat toward the lens…and it’s cheap and fast. After 2 days under this intense light, the yellowing was gone. I placed my Super Takumar 50/1.4 (7 element version) front down(without filter) on a small mirror, with a cheap IKEA LED desk lamp (the $15 dollar bendable model with base clip). However, the lens will gradually trend (darken over years) back toward equilibrium in between “RECOVERY” treatments. High intensity light accelerates the RECOVERY of these defects. The higher the concentration of the ThO2, the darker that eventual equilibrium. However, since the ThO2 is homogeneously present in the structure, an equilibrium will be reached. The defects will RECOVER over time if the ionizing source is removed. These defects introduce new wavelength absorptions (i.e. Within the element, the ionizing radiation causes defects in the chemical bonds with the glass. It’s the glass itself…specifically the glass element in which the Thorium Oxide is homogeneously present. This is not especially due to the irradiation of coatings, cement or glue. However, the Super Tak had a brownish tinge effect. I have both the Helios 58mm/F2 and the Super Takumar 50mm/F1.4. You will not be spending a penny more using these links, while still helping as eBay will pay out a small percentage from any purchase or successful bid, which in turn will support new content on Thank you. I’ve joined the ebay affiliate program to help me run this website, fund my tests & lens giveaways, so if you found this content useful and would like to help me produce more similar content, please use the ebay links in this post if you’re planning to buy one of these lenses or bookmark or use this link if you want to buy anything else on or this link if you shop on .uk. I hope they will help you save some money on your future lens investments too. I do my best to make this website a great resource for people interested in vintage lenses for video use, so I hope you’ve enjoyed this & other posts. Thank you to Victor for sharing his review, check out his youtube channel for more useful videos! Helios 44-2 58mm F2 on eBay Takumar 55mm F2 on eBay Is there a winner in this comparison? For me Helios will always be a special lens, but Takumar is just as worthy and is even more suitable for projects when you want a cleaner but still pleasant, organic look. It’s also important to note that both lenses perform quite nicely wide open, so even though they are slower than most other 50s, you don’t need to step them down to get usable images. It’s certainly more suitable for every day shooting where Helios might a bit too much. While Helios is bursting with character including dreamy flares & swirly bokeh, Takumar is a little bit more conservative, but still has a very pleasant look. F2 wide open is not impressive at all for a 50mm lens, but as proved by Helios, specs don’t always matter and sometimes slower lenses actually are just as good if not better than faster alternatives. The lens in question is the Pentax Asahi Super-Takumar 55mm F2 which costs about the same as Helios and has similar un-amusing specs. I am real Helios 44-2 58mm F2 “fanboy” I recommend it to everyone who asks me for a vintage lens advice, but thanks to the video made by fellow vintage lens fan, Victor Bart, there is a “new” kid on the block that we should be taking the notice of.
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