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Passiflora of my backyard
Lens: Pentacon AV 80/2.8 Projector lens Camera: K-5 Photo Location: Poitiers 
Posted By: Jean Poitiers, 11-14-2014, 04:22 AM

Bonjour,

Here's another projector lens that I removed form the majority from its plastic casing ...

Later I incorporated this lens into a Helios 44-2 body in order to have an aperture.

Salut, J





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11-14-2014, 04:25 AM   #2
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The shallow DOF creates an interesting effect Jean.
11-14-2014, 04:35 AM   #3
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QuoteOriginally posted by eaglem Quote
The shallow DOF creates an interesting effect Jean.
Merci eaglem ... the lack of an aperture makes shooting these projector lenses quite interesting at times.

I will later post an image from the same lens but stopped down via a Franken-lens mutation ... J
11-14-2014, 04:58 AM   #4
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Interesting work with these lenses. Would the Pentacon 2.8/80 be the same lens formula as the Zeiss Biometar 2.8/80 ? I know some Zeiss lenses became Pentacon depending on where they were manufactured but I am not sure how comparable they are. I wish I had the time to mess about with stuff like that!

11-14-2014, 05:02 AM   #5
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QuoteOriginally posted by PJ1 Quote
Interesting work with these lenses. Would the Pentacon 2.8/80 be the same lens formula as the Zeiss Biometar 2.8/80 ? I know some Zeiss lenses became Pentacon depending on where they were manufactured but I am not sure how comparable they are. I wish I had the time to mess about with stuff like that!
Thanks for your comments and I do not know about the Zeiss Biometar lens ... Could be like the "aus Jena" lenses and the CZ(J) lenses re-branding. You have raise an interesting point/question that I really had not thought about. J
11-14-2014, 06:16 AM   #6
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Great capture, I like how the shallow DOF creates a mood.

I believe that flower came to visit here a while ago

11-14-2014, 07:54 AM   #7
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Wow that looks great Jean!
11-14-2014, 08:19 AM   #8
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Boys and their toys. Nice job.

11-14-2014, 08:23 AM   #9
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oh dear, you are a real lens maker !! and the photo is amazing
11-14-2014, 08:29 AM   #10
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QuoteOriginally posted by bdery Quote
Great capture, I like how the shallow DOF creates a mood.

I believe that flower came to visit here a while ago
Thanks a lot ... the shallow DOF makes using these lenses quite interesting. J
11-14-2014, 12:59 PM   #11
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I loved it but I wish it had *just* a tad more depth of field. As it is, there's like one stem in focus... but great mood, as everybody else said.
11-14-2014, 01:12 PM   #12
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QuoteOriginally posted by ChristianRock Quote
I loved it but I wish it had *just* a tad more depth of field. As it is, there's like one stem in focus... but great mood, as everybody else said.
Merci, Christain ... that's the one downside of the aperture-less lenses.

It's all "wide open" which is good, but sometimes a bit more DOF would be helpful overall. J
11-14-2014, 02:34 PM   #13
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QuoteOriginally posted by Jean Poitiers Quote
Merci, Christain ... that's the one downside of the aperture-less lenses.

It's all "wide open" which is good, but sometimes a bit more DOF would be helpful overall. J
No problem. Still a great capture. The more I look at it, the more I like it
11-14-2014, 02:49 PM   #14
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I'm very intrigued by your work. How much time do you spend weekly just to "create" the lenses and make experiments with them?
Another great job!
11-14-2014, 02:53 PM   #15
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QuoteOriginally posted by flaviopetrone Quote
I'm very intrigued by your work. How much time do you spend weekly just to "create" the lenses and make experiments with them?
Another great job!
Thanks for your comment.

It's usually on the weekends (nights) after the kids are in bed and things are quite. How much time ... well, it depends and I generally do not keep track. Maybe an hour per lens or so ... it varies a lot.

I just tinker and experiment. Plus, you will note that I do not show off my (few) failed experiments ... ha! J
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