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WolverineX
Joined: 19 Apr 2009 Posts: 1694 Location: Zagreb , Croatia , Europe
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Posted: Fri May 11, 2012 7:18 pm Post subject: Do Pen F lenses keep their focal length on m4/3? |
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WolverineX wrote:
now that i have m4/3 camera i can use Olympus Pen F lenses, so i am interested to know if those lenses keep their native focal length on 2x crop sensor, with Pen F being half frame format system? _________________ my tools:Oly E-M5 + 45mm/1.8 + Oly E-520 + 12-60 + 14-42 + 70-300 + Sigma 105mm + FL-50R + EC20 + SRF-11 ring flash
http://forum.mflenses.com/wolverinex-testing-my-lenses-series-link-list-t39524.html |
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ludoo
Joined: 18 Sep 2009 Posts: 1397 Location: Milan, Italy
Expire: 2011-12-05
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Posted: Fri May 11, 2012 7:26 pm Post subject: |
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ludoo wrote:
Focal length does not change, what changes between formats is the angle of view...
Or to answer your question, a 50mm is always a 50mm, independently from the format it was originally developed for: a medium format 50mm lens will give you the same angle of view on m4/3 as a "normal" 50mm developed for the 35mm format. Which is half the angle of view you get on 35mm full frame.
A practical example: a 100mm lens on 6x9 has an horizontal angle of view of 45 degrees, on full frame 35mm the same 100mm lens gives you an angle of view of 20 degrees (20.41). To get 45 degrees on 35mm full frame, you have to use a 43mm lens. _________________ My galleries
Digital: Samsung EX-1
Past Digital: Samsung NX10, Sigma SD9, Sigma SD10, SD14, DP2, Pentax *istD, Kx, Fuji S2 Pro, Canon 5D
Analog: packfilm Polaroids, 6x9 Kodak folders, Pentacon Taxona half-frame, Fujica ST605n, Walz Envoy, Olympus 35 S-II, Olympus Wide S
Past Analog: Polaroid 600se, Polaroid 110B, Canon IIF, various fixed-lens and Russian rangefinders, ...
Past Lenses: Nikkor 24/2.8, Nikkor SC 50/1.4, Nikkor 50/2, Nikkor H 85/1.8, Nikkor P 105/2.5, Nikkor Q 135/3.5, Fujinon 100/2.8, Fujinon EBC 100/2.8, Fujinon EBC 135/3.5, Fujinon EBC 200/4.5, Mamiya SX 135/2.8, CZJ Flektogon 35/2.4, CZJ Pancolar 50/1.8 zebra, CZJ Sonnar 135/3.5, ...
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WolverineX
Joined: 19 Apr 2009 Posts: 1694 Location: Zagreb , Croatia , Europe
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Posted: Fri May 11, 2012 7:37 pm Post subject: |
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WolverineX wrote:
ludoo wrote: |
Focal length does not change, what changes between formats is the angle of view...
Or to answer your question, a 50mm is always a 50mm, independently from the format it was originally developed for: a medium format 50mm lens will give you the same angle of view on m4/3 as a "normal" 50mm developed for the 35mm format. Which is half the angle of view you get on 35mm full frame.
A practical example: a 100mm lens on 6x9 has an horizontal angle of view of 45 degrees, on full frame 35mm the same 100mm lens gives you an angle of view of 20 degrees (20.41). To get 45 degrees on 35mm full frame, you have to use a 43mm lens. |
you misunderstood me, i know what you wrote about,after all i'm using manual lenses on 4/3 for 3 years now, but film Pen F system was half the 35mm frame, so the lenses for it must have been made to accomodate that. that being said, i believe, that if i use them on m4/3 angle of view stays the same. _________________ my tools:Oly E-M5 + 45mm/1.8 + Oly E-520 + 12-60 + 14-42 + 70-300 + Sigma 105mm + FL-50R + EC20 + SRF-11 ring flash
http://forum.mflenses.com/wolverinex-testing-my-lenses-series-link-list-t39524.html |
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Nesster
Joined: 24 Apr 2008 Posts: 5883 Location: NJ, USA
Expire: 2014-02-20
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Posted: Fri May 11, 2012 7:39 pm Post subject: |
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Nesster wrote:
The 'normal' PEN FT lens is 38mm - the fov on a m4/3 2x crop factor would give fov equivalent of 76mm in 35mm... No I didn't say that too clearly. The 2x crop factor applies for all lenses, to get the '35mm equivalent'.
The 'normal' 24mm lens for 110 is more like a m4/3 'normal'
pen FT lenses by Nesster, on Flickr _________________ -Jussi
Camera photos
Print Photographica
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WolverineX
Joined: 19 Apr 2009 Posts: 1694 Location: Zagreb , Croatia , Europe
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Posted: Fri May 11, 2012 7:43 pm Post subject: |
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WolverineX wrote:
Nesster wrote: |
The 'normal' PEN FT lens is 38mm - the fov on a m4/3 2x crop factor would give fov equivalent of 76mm in 35mm... No I didn't say that too clearly. The 2x crop factor applies for all lenses, to get the '35mm equivalent'.
The 'normal' 24mm lens for 110 is more like a m4/3 'normal'
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so it doesn't matter that the lenses for PEN covered only half of the regular 35mm frame? or did they cover full 35mm frame but PEN camera used only half of that coverage? _________________ my tools:Oly E-M5 + 45mm/1.8 + Oly E-520 + 12-60 + 14-42 + 70-300 + Sigma 105mm + FL-50R + EC20 + SRF-11 ring flash
http://forum.mflenses.com/wolverinex-testing-my-lenses-series-link-list-t39524.html |
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RTI
Joined: 15 Jul 2011 Posts: 282 Location: Moldova, Chisinau
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Posted: Fri May 11, 2012 7:49 pm Post subject: |
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RTI wrote:
WolverineX wrote: |
Nesster wrote: |
The 'normal' PEN FT lens is 38mm - the fov on a m4/3 2x crop factor would give fov equivalent of 76mm in 35mm... No I didn't say that too clearly. The 2x crop factor applies for all lenses, to get the '35mm equivalent'.
The 'normal' 24mm lens for 110 is more like a m4/3 'normal'
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so it doesn't matter that the lenses for PEN covered only half of the regular 35mm frame? or did they cover full 35mm frame but PEN camera used only half of that coverage? |
No it doesn't matter, as an example take most point and shoot - the focal length is written in 35mm equivalent. _________________ Cameras: Canon 5DIII, Zorki-4, Canon AE-1
MF:Rokkor 58/1.2, Rokkor MC 58/1.4, Yashica ML 50/1.7, M39 Jupiter-9 (silver 1955), Zuiko 35-70/3.6
AF: Sigma Art 35/1.4, Tamron 24-70/2.8 VC, |
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Nordentro
Joined: 24 Jun 2010 Posts: 4710 Location: Lillehammer, Norway
Expire: 2015-01-29
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Posted: Fri May 11, 2012 9:00 pm Post subject: |
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Nordentro wrote:
WolverineX wrote: |
Nesster wrote: |
The 'normal' PEN FT lens is 38mm - the fov on a m4/3 2x crop factor would give fov equivalent of 76mm in 35mm... No I didn't say that too clearly. The 2x crop factor applies for all lenses, to get the '35mm equivalent'.
The 'normal' 24mm lens for 110 is more like a m4/3 'normal'
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so it doesn't matter that the lenses for PEN covered only half of the regular 35mm frame? or did they cover full 35mm frame but PEN camera used only half of that coverage? |
Half frame meant that the camera used a 18×24 mm vertical (portrait) format, producing twice the pictures on a roll of 135 film as the regular 36×24 mm format. _________________ Lars | Lens collection | Manuellfokus.no |
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cambug
Joined: 06 Jun 2010 Posts: 91
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Posted: Sun May 13, 2012 5:58 pm Post subject: |
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cambug wrote:
In fact the physical dimensions of a APS-C sensor is quite close to half frame of 35mm film ( 18x24 / 24x36 )mm, yet the cropping factor is only 1.5x / 1.6x. So the half size does not translate into a cropping factor of 2, the cropping ratio is determined by dividing the diagonal length of film format ( 43.3 for 35mm ) with the diagonal length of digital sensor. Also the ratio of the area swould be the square of the cropping factor...
If the sensor is exactly half the size of a 35mm full frame, the cropping factor should be 1.414, square root of 2, the same as the each step of lens aperture ratio... |
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John Shriver
Joined: 24 Dec 2009 Posts: 192
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Posted: Thu May 17, 2012 12:19 am Post subject: |
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John Shriver wrote:
But 4/3 and Micro-4/3 have a 13 x 17.3 mm sensor. Yes, the Pen F lenses cover APS-C, but I think the only APS-C cameras with a small enough flange-to-sensor distance to be used with them are the Sony NEX's and the Fuji XPro-1. They won't work on any APS-C SLR I can think of.
So the 38mm lens was a "normal" lens on an 18 x 24mm half-frame exposure. On the Micro-4/3 sensor it will be a short telephoto, about the equivalent of a 75mm on a 35mm camera. |
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Nordentro
Joined: 24 Jun 2010 Posts: 4710 Location: Lillehammer, Norway
Expire: 2015-01-29
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Posted: Thu May 17, 2012 10:00 pm Post subject: |
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Nordentro wrote:
m43 sensor is close to "quart frame"
But as an multi user of m43 cameras, let's stick to the 2x crop factor term _________________ Lars | Lens collection | Manuellfokus.no |
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Phenix jc
Joined: 19 Dec 2009 Posts: 398 Location: France
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Posted: Fri May 18, 2012 10:15 pm Post subject: |
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Phenix jc wrote:
18x24 :
The 38mm is a 55mm 35mm equivalent
The 70mm is a 100mm 35mm equivalent
The 100mm is a 143mm 35mm equivalent
So m4/3 : Can we say that the 38mm is a 112mm 35mm equivalent ?
And Nex : a 83mm 35mm equivalent ? _________________ "Plonger les choses dans la lumière, c'est les plonger dans l'infini" Léonard De Vinci
f/1.2 club Zuiko : 50/1.2, 55/1.2 Rokkor : 50/1.2, 58/1.2 Nikkor : 50/1.2, 55/1.2 Third Party : Porst(Fujinon-X) 50/1.2, Porst 55/1.2 Canon : S 50/1.2, nFD 50/1.2, FL 55/1.2, R 58/1.2, nFD 85/1.2 Hexanon : 57/1.2 Nokton : 50/1.1 |
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