I have found rolleiflex 2.8 biometar 1 of 1250 made at local auction for a mere $225 so I dumped some money into it sent it to Rollei Repairs Harry Fleenor he did a great job.
Can anyone tell me is this the exact same lens and formula used on a pentacon six camera?
Well, there were two Biometars made (as stand-alone lenses), 80mm and 120mm.
Your camera is from a period when the german photographic industry was just starting up again. And back then there still was exchange of products between the respective manufacturers in both parts of Germany.
Depending on the condition it's potentially worth substantially more than you paid for it, so you got a real bargain. Add another zero . . . . . roughly and that's a lowish value it could be higher.
CZJ's coatings at that time were very good but you'll need a warm-up filter for colour work, I use a CZJ 150mm f4.5 Tessar from about the same year 1953.
The Biometar was made in various focal lengths from 50mm to at least 210mm (in a Prontor shutter).
I got my beaten up 2.8 Planar a number of years ago in a dusty Beijing market stall for $170 USD. Since fixed up and working fine but still a "user". The really amazing thing here is not 2.8 for so cheap but a Biometer lens camera for that cheap. These are rarely seen, even rarer than the Rolleiwide.
I liked cameras for a long time. I used to buy just what I wanted to use. We ran into a hard time so I bought and sold cameras for a period of time I've gotten good at buying the not so obvious items in the box in the corner of the floor kind of thing that's how I could make a profit. I can count the best finds on my hands and feet rare stuff is hard to come by. But I do find rare things I try to keep things now. We ran into pinch so I had to sell my Linhof III complete outfit reluctantly. My wife dragged me to an auction for oil paintings thats what my dad would collect the Rollei was there with the lens cap on it was also featured on auctionzip with the cap on so it looked like an 2.8c which gave me the upper hand since I was there and seen the lens on the camera. And I took some of the money from the Linhof sale to buy the camera. I want to keep this one happy again
Randy, to come back to your original question: John Phillips writes in "The classic Rollei": the Biometar was originally designed for the Master Korelle, then chosen by Rollei for the 2,8B, "eventually ended up serving as a standard lens on the East German 6x6 SLR, the Praktisix."
So it seems to be the same lens design.
According to Phillips: "the most elusive of all the production-line Rolleis" He searched for it for seven years!