HELP!



I need some help and info about a lens that I recently bought. I have just purchased my first large format camera, though I've been a shooter for many years (using 35 and 2-1/4).



While at a flea market, I picked up a 4X5 enlarger for parts (it cost me a whomping $10). and I found this lens on it:











it is a ring-mount lens; and I'm pretty sure its for a 4X5 camera, but I coul d be wrong.



It's marking are "COMPUR" on the name plate; "Contessa" and "Nettel" on the top, and it has a numbering of "D.R.P. No 258646 D.R.G.M." on it. What does any of this mean?



The barrel of the lens itself has the following info:



Tessar 1=6.3 f=16.5 cm (which of course makes it a 165mm ƒ/6.3) But what does "tessar" mean?



It is a Carl Zeiss Jena. What does "jena" mean?



Sorry to seem so ignorant on most of this; I'm new to the large format game; and I'd love to find out if this lens was a lucky treasure or just a nice pape rweight...



Please Drop me an email at Bob@eyekonpho to.com if you can help with any info on this!



Thanks!!!