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symphonic
Joined: 23 May 2010
Posts: 550
Location: SE Europe, Croatia
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 Posted: Wed Jul 07, 2010 2:10 pm Post subject: Max. magnification of a lens? |
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symphonic wrote:
Is there a way to calculate a lens magnification ratio, if you have certain lens specs (minimum focus distance, focal length etc)?
I've been searching a bit on the Internet and I've found answers on several places that it's not possible. (due to each lens having a different design, so it's not that simple to calculate it).
I'm interested to find out the magnifications ratios of some, mostly CZJ lenses. It's easy to google and find out this detail about almost any AF lens, but it's hard to find info on mag. ratios of old, manual lenses.
I know one can find out by taking a shot of a ruler on the closest focus and comparing the size with the size of the sensor, but that's not really helpful when you don't have the lens to try it...
_________________
Toni,
EOS 450D
CZJ Sonnar 135/3.5 MC | Pancolar 50/1.8 MC
Contax Planar 50/1.4 AEJ | Contax Sonnar 135/2.8 AEJ
Yashica ML 28/2.8 | Zuiko 28/3.5
Vivitar Series1 105/2.5 OM
AF: Tokina 12-24 |
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kansalliskala
Joined: 19 Jul 2007
Posts: 5027
Location: Southern Finland countryside
Expire: 2016-12-30
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| Posted: Wed Jul 07, 2010 2:32 pm Post subject: |
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kansalliskala wrote:
I think it is standard trigonometry? 50 mm lens produces 46 degrees angle of view and the if you take half of it you get a triangle that has the shorter ..   
Ok, I forgot all school geometry, but it shouldn't be too hard. 
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MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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vulko
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| Posted: Wed Jul 07, 2010 2:35 pm Post subject: |
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vulko wrote:
It depends... on how far from the object you are. If you shoot with 50mm lens from 30mm you get magnification. If you shoot with 135mm lens from 30 meters, you geting reduction of the object. |
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symphonic
Joined: 23 May 2010
Posts: 550
Location: SE Europe, Croatia
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| Posted: Wed Jul 07, 2010 2:43 pm Post subject: |
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symphonic wrote:
| vulko wrote: |
| It depends... on how far from the object you are. If you shoot with 50mm lens from 30mm you get magnification. If you shoot with 135mm lens from 30 meters, you geting reduction of the object. |
I'm aware of that, but I'm talking about the maximum magnification of a lens (which is always at the closest focus distance).
btw. I read somewhere that for telephoto lenses it's approximately closest_focal_distance / focal_length, but I'm curious why would that formula be true only for longer FL lenses.
_________________
Toni,
EOS 450D
CZJ Sonnar 135/3.5 MC | Pancolar 50/1.8 MC
Contax Planar 50/1.4 AEJ | Contax Sonnar 135/2.8 AEJ
Yashica ML 28/2.8 | Zuiko 28/3.5
Vivitar Series1 105/2.5 OM
AF: Tokina 12-24 |
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visualopsins
Joined: 05 Mar 2009
Posts: 10569
Location: California
Expire: 2025-04-11
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| Posted: Wed Jul 07, 2010 3:00 pm Post subject: |
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visualopsins wrote:
google "calculate lens magnification"
get: Calculating the magnification of optical systems
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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 (151B), 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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calvin83
Joined: 12 Apr 2009
Posts: 7553
Location: Hong Kong
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| Posted: Wed Jul 07, 2010 3:12 pm Post subject: |
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calvin83 wrote:
I think it is not possible to calculate the magnification of camera lens just by the MFD and focal length since every lens have different optical design.
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https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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symphonic
Joined: 23 May 2010
Posts: 550
Location: SE Europe, Croatia
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| Posted: Wed Jul 07, 2010 3:16 pm Post subject: |
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symphonic wrote:
| calvin83 wrote: |
| I think it is not possible to calculate the magnification of camera lens just by the MFD and focal length since every lens have different optical design. |
That's exactly what I read, but I wanted someone to confirm it. thx
_________________
Toni,
EOS 450D
CZJ Sonnar 135/3.5 MC | Pancolar 50/1.8 MC
Contax Planar 50/1.4 AEJ | Contax Sonnar 135/2.8 AEJ
Yashica ML 28/2.8 | Zuiko 28/3.5
Vivitar Series1 105/2.5 OM
AF: Tokina 12-24 |
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calvin83
Joined: 12 Apr 2009
Posts: 7553
Location: Hong Kong
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| Posted: Wed Jul 07, 2010 3:20 pm Post subject: |
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calvin83 wrote:
Take a look at this link:
http://www.mystd.de/album/calculator/magnification.html
_________________
https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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