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valjo
Joined: 10 Oct 2008
Posts: 68
Location: Bulgaria
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 Posted: Fri Jan 16, 2015 4:52 pm Post subject: Part of which unknown lens? |
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valjo wrote:
This part has a mirror at the bottom, facing inside the lens.
On the other side of the mirror there is an inscription:
FAX ROKKOR F4.5/150mm
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Canon D60
3.5/135 Jupiter 37A |
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ZoneV
Joined: 09 Nov 2009
Posts: 1633
Location: Germany
Expire: 2011-12-02
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| Posted: Fri Jan 16, 2015 7:20 pm Post subject: |
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ZoneV wrote:
This is not a part of a lens, but the complete lens.
With the mirror the image is reflected back through the lens, and so the lens is kind of doubled!
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valjo
Joined: 10 Oct 2008
Posts: 68
Location: Bulgaria
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| Posted: Fri Feb 13, 2015 11:35 am Post subject: |
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valjo wrote:
| ZoneV wrote: |
This is not a part of a lens, but the complete lens.
With the mirror the image is reflected back through the lens, and so the lens is kind of doubled! |
i don`t believe this is complete lens
Maybe this is part of a mirror lens?
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Canon D60
3.5/135 Jupiter 37A |
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Lightshow
Joined: 04 Nov 2011
Posts: 3669
Location: Calgary
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| Posted: Fri Feb 13, 2015 4:26 pm Post subject: |
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Lightshow wrote:
As far as I can tell, it was never designed for photography, but is a technical lens used possibly in scanning, I don't know if the mirror part is removable.
It is most definitely not from a photography "mirror lens".
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visualopsins
Joined: 05 Mar 2009
Posts: 10543
Location: California
Expire: 2025-04-11
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| Posted: Fri Feb 13, 2015 6:06 pm Post subject: |
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visualopsins wrote:
You know what is FAX machine? Old technology for sending documents over phone land lines. Look in wikipedia.
The lens is from FAX machine. In first photo I would unscrew that ring -- the mirror might be removed. If so, you will have a 4.5/150 for use with bellows.
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Lenses:
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Lloydy
Joined: 02 Sep 2009
Posts: 7785
Location: Ironbridge. UK.
Expire: 2022-01-01
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| Posted: Fri Feb 13, 2015 6:44 pm Post subject: |
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Lloydy wrote:
The mirror was probably for setting the focus in the machine, then removed for use.
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ZoneV
Joined: 09 Nov 2009
Posts: 1633
Location: Germany
Expire: 2011-12-02
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| Posted: Sun Feb 15, 2015 11:35 am Post subject: |
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ZoneV wrote:
"Applied Photographics Optics" by Sidney F. Ray:
p.378 / 41.3.1 Electrophotography
"..A novel approach in office copiers is the use of a catdioprtric lenses formed from one half of a symmetrical lens plus a miror. The symmetry of the optical layout allows the half-lens to have a dual imaging role, and costs are reduced."
For such applications is is possible to make very simple lenses. Only the half of a lens needed -> half cost for lenses and manufacturing + a plane surface mirror.
For pure refractive work without the mirror the lens will be bad - relative to that what it is with the mirror and use of designed distances.
_________________
Camera modification, repair and DIY - some links to look through: http://www.4photos.de/camera-diy/index-en.html
I AM A LENS NERD!
Epis, Elmaron, Emerald, Ernostar, Helioplan and Heidosmat.
Epiotar, Kameraobjektiv, Anastigmat, Epis, Meganast, Magnagon, Quinar, Culmigon, Novotrinast, Novflexar, Colorplan, Sekor, Kinon, Talon, Telemegor, Xenon, Xenar, Ultra, Ultra Star. Tessar, Janar, Visionar, Kiptar, Kipronar and Rotelar.
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