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cambug
Joined: 06 Jun 2010
Posts: 91
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 Posted: Mon Aug 05, 2013 2:40 am Post subject: Prototype Sonnar with aperture of 2 decimal points |
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cambug wrote:
This is the first time I have seen a lens, apart from the 50mm 0.95, with an aperture marking of 2 decimal points, have a look:
http://www.ebay.com/itm/Rare-Carl-Zeiss-Jena-V1923-Nr-3-85mm-f-1-75-SONNAR-prototype-lens-/251314602619?pt=LH_DefaultDomain_0&hash=item3a8384827b
From the serial number of the lens, probably only a few were made, the interesting point is, why provide 2 decimal points for the aperture while the focal length marking is kind of standardized? It is easy to understand the 50mm f.95, as the aperture is larger than 1, a small decrease in the decimal can mean a big increase in dimensions. Anyone have seen other examples of 2 decimal point aperture? |
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kds315*
Joined: 12 Mar 2008
Posts: 16544
Location: Weinheim, Germany
Expire: 2021-03-09
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| Posted: Mon Aug 05, 2013 5:23 am Post subject: |
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kds315* wrote:
You have answered your own question...
It has a "V..." serial number which in German stands for "Versuchsobjektiv" or "test lens" so it is a development sample.
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ZoneV
Joined: 09 Nov 2009
Posts: 1633
Location: Germany
Expire: 2011-12-02
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| Posted: Mon Aug 05, 2013 9:33 am Post subject: |
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ZoneV wrote:
Other fast lenses like f/0.85, f/0.75.. have the same as you have realized.
But some few companies even give two digits after decimal point. For example for telecentric or macro lenses.
Probably this is a result from calculating the f/stop from numerical aperture values there.
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Layer-cake
Joined: 18 Mar 2013
Posts: 560
Location: Cape Town
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| Posted: Thu Aug 15, 2013 7:51 am Post subject: |
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Layer-cake wrote:
| Yahvel wrote: |
| wow, that lens sold for over $4,000. |
That is rather epic!!!  |
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bernhardas
Joined: 01 Jan 2013
Posts: 1437
Expire: 2017-05-23
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| Posted: Thu Aug 15, 2013 9:27 am Post subject: |
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bernhardas wrote:
edited
Last edited by bernhardas on Thu Apr 28, 2016 1:49 pm; edited 1 time in total |
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Layer-cake
Joined: 18 Mar 2013
Posts: 560
Location: Cape Town
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| Posted: Thu Aug 15, 2013 9:31 am Post subject: |
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Layer-cake wrote:
| bernhardas wrote: |
| I put some bids in but all lenses from this collection go waaaay over my budget. |
If you could put up the links for the other lenses I would appreciate it, would like to see some other prototype lenses! |
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GeorgeSalt
Joined: 09 Feb 2013
Posts: 336
Location: Norfolk, UK
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| Posted: Thu Aug 15, 2013 9:43 am Post subject: |
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GeorgeSalt wrote:
| Layer-cake wrote: |
| bernhardas wrote: |
| I put some bids in but all lenses from this collection go waaaay over my budget. |
If you could put up the links for the other lenses I would appreciate it, would like to see some other prototype lenses! |
Click to view sellers other items, then select Completed listings (you'll need to be logged into Ebay to do this) |
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Layer-cake
Joined: 18 Mar 2013
Posts: 560
Location: Cape Town
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| Posted: Thu Aug 15, 2013 12:51 pm Post subject: |
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Layer-cake wrote:
| GeorgeSalt wrote: |
| Layer-cake wrote: |
| bernhardas wrote: |
| I put some bids in but all lenses from this collection go waaaay over my budget. |
If you could put up the links for the other lenses I would appreciate it, would like to see some other prototype lenses! |
Click to view sellers other items, then select Completed listings (you'll need to be logged into Ebay to do this) |
I see, I shall have to create an account then  |
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