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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15685
Expire: 2014-01-07
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 Posted: Tue Jun 21, 2011 11:53 pm Post subject: 10cm diameter vintage magic lantern lens. |
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iangreenhalgh1 wrote:
Hi folks
This is a huge and heavy 10cm diamter lens from a magic lantern projector.
The front and rear elements are both very convex and symmetrical, no idea what design this has, it is very distorted and very wide angle. In good condition with only one tiny piece of fungus right at the edge and no scrathes or marks, just a tiny bit of dust.
No markings on it that I can see.
ANyone go any idea what king of focal length this might be and what kind of maximum focus distance might I get if I mount it on my EOS 10D?
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I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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RioRico
Joined: 12 Mar 2010
Posts: 1120
Location: California or Guatemala or somewhere
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| Posted: Wed Jun 22, 2011 1:31 am Post subject: Re: 10cm diameter vintage magic lantern lens. |
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RioRico wrote:
| iangreenhalgh1 wrote: |
| ANyone go any idea what king of focal length this might be and what kind of maximum focus distance might I get if I mount it on my EOS 10D? |
Humongous!! How much does it weigh?
You know the focal-length trick, right? Hold the lens under a light over a flat white surface and see where the lens focuses. I do this under a ceiling fluorescent tube; when the projected edges are sharp, that's about the focal length. I hold a ruler next to the lens to measure the distance from the target surface.
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Too many film+digi cams+lenses, oh my -- Pentax K20D, K-1000, M42s, more
The simple truth is this: There are no neutral photographs. --F-Stop Fitzgerald |
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mmelvis
Joined: 24 May 2010
Posts: 1326
Location: Florida,USA
Expire: 2015-05-09
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| Posted: Wed Jun 22, 2011 1:35 am Post subject: |
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mmelvis wrote:
Place the lens near a white wall and focus the image by moving the lens back and forth.
Measure distance from the wall to the rear of the lens , this will give you the focal length of the lens
Divide the distance from the wall by the front lens diameter to get the f stop.
This should get you started |
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visualopsins
Joined: 05 Mar 2009
Posts: 10532
Location: California
Expire: 2025-04-11
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| Posted: Wed Jun 22, 2011 1:52 am Post subject: |
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visualopsins wrote:
Note the FL trick works for enlarger lenses and projection lenses, but not for camera lenses.  The trick using a camera lens will give the camera register distance instead of lens focal length.
Bob tells how to measure FL
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Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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RioRico
Joined: 12 Mar 2010
Posts: 1120
Location: California or Guatemala or somewhere
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| Posted: Wed Jun 22, 2011 2:49 am Post subject: |
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RioRico wrote:
Neither Bob's easy nor hard ways are very usable nor straightforward.
There is a much easier way to measure FL, based on this: A non-reversed lens cannot focus closer than its focal length. So, mount a lens on extension (tubes an/or bellows) on a camera, preferably one with LiveView. Rack that baby out a bit. Move it towards a target. When the target shows sharply, you're at the focal length, which is also the minimum focus distance.
You'll probably want to be at around 1:1 magnification for this. For long long lenses, that could mean a LOT of extension. And no, it doesn't measure the FL at infinity focus. You'll just have to trust the lensmaker on that.
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Too many film+digi cams+lenses, oh my -- Pentax K20D, K-1000, M42s, more
The simple truth is this: There are no neutral photographs. --F-Stop Fitzgerald |
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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15685
Expire: 2014-01-07
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| Posted: Wed Jun 22, 2011 1:01 pm Post subject: |
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iangreenhalgh1 wrote:
I think I'll mount this beast on a set of bellows to find the infinity. I'll just have to figure out now to mount it, some kind of metal reducing piece from 100mm to 50mm then attach an M42 ring to fit the bellows.
The other magic lantern lenses I've seen being used as camera lenses are all around 50mm diameter (2inch) so this one is quite different.
I don't think this has a very long FL, it seems to be almost a fisheye when looking through it. I have a nasty feeling it won't work on a camera as the register will be too small.
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I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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Scheimpflug
Joined: 06 Feb 2010
Posts: 1888
Location: New Zealand / USA
Expire: 2011-11-18
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| Posted: Wed Jul 06, 2011 10:43 pm Post subject: |
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Scheimpflug wrote:
What a fun looking lens! 
When I first saw it, I couldn't help but think of the water-filled Sutton panoramic lens.
http://www.novacon.com.br/odditycameras/sutton.htm
http://www.earlyphotography.co.uk/site/entry_L129.html#L129
Do keep us posted on the results of your focus testing!
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Sigma DP1, Nikon D40 (hers ), Polaroid x530, Pentax P30t, Pentax P50, (P30t/P50 K-A to Nikon F body mount conversion)
Nikon: 18-55/3.5-5.6 "G ED II DX" (F) Soligor: 28/2.8 (FL->F converted), 135/3.5 (F), 3x TC (F, modified) Kalimar: 28-85/3.5 (F)
Vivitar: 70-210/2.8-4.0 Version 3 (F), Tele 500/6.3 Preset (F), 19/3.8 (F) Minolta: 300/5.6 (SR/MC/MD pending F conversion)
Tamron: 28/2.8 (Adaptall) Panagor: 28/2.5 (FD) Aetna: 300/5.6 (F) Osawa: MC 28/2.8 (F)
Vintage Lenses: Dallmeyer: 1940s A.M. 14in 356mm f4 (ULF->M42) 1930s Adon Telephoto Taylor, Taylor & Hobson: 1880s Rapid Rectilinear 8 1/2 x 6 1/2 11.31in f/8 (LF->?)
Parts Lenses: Nikon 35-135/3.5-4.5 (F), Sigma 70-210/4.5 (F), Nikon 50/1.8 Series E (F) |
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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15685
Expire: 2014-01-07
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| Posted: Wed Jul 06, 2011 11:18 pm Post subject: |
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iangreenhalgh1 wrote:
Ah yes, I remember the thread about that lens now.
I forgot about his magic lantern lens, I will have to get it out tomorrow and see if I can cobble together some kind of mounting for it on my bellows and see if I can get any kind of picture out of it!
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I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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Scheimpflug
Joined: 06 Feb 2010
Posts: 1888
Location: New Zealand / USA
Expire: 2011-11-18
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| Posted: Wed Jul 06, 2011 11:27 pm Post subject: |
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Scheimpflug wrote:
| iangreenhalgh1 wrote: |
| Ah yes, I remember the thread about that lens now. |
It was only two weeks ago! 
There's always too many projects, eh? 
_________________
Sigma DP1, Nikon D40 (hers ), Polaroid x530, Pentax P30t, Pentax P50, (P30t/P50 K-A to Nikon F body mount conversion)
Nikon: 18-55/3.5-5.6 "G ED II DX" (F) Soligor: 28/2.8 (FL->F converted), 135/3.5 (F), 3x TC (F, modified) Kalimar: 28-85/3.5 (F)
Vivitar: 70-210/2.8-4.0 Version 3 (F), Tele 500/6.3 Preset (F), 19/3.8 (F) Minolta: 300/5.6 (SR/MC/MD pending F conversion)
Tamron: 28/2.8 (Adaptall) Panagor: 28/2.5 (FD) Aetna: 300/5.6 (F) Osawa: MC 28/2.8 (F)
Vintage Lenses: Dallmeyer: 1940s A.M. 14in 356mm f4 (ULF->M42) 1930s Adon Telephoto Taylor, Taylor & Hobson: 1880s Rapid Rectilinear 8 1/2 x 6 1/2 11.31in f/8 (LF->?)
Parts Lenses: Nikon 35-135/3.5-4.5 (F), Sigma 70-210/4.5 (F), Nikon 50/1.8 Series E (F) |
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iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15685
Expire: 2014-01-07
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| Posted: Wed Jul 06, 2011 11:31 pm Post subject: |
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iangreenhalgh1 wrote:
I have almost banned myself from more purchases, I have too many lenses waiting to be tested and many projects involving adapting unusual oddities for use on a camera too. I also have a load of lenses I need to sell as I don't need them anymore and they are gathering dust.
So yes, too many projects!
But it's fun!
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