Voigtlander 25mm f:0.95 for Micro Four Thirds

[epand56]

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I saw that Voigtlander will issue a series of lenses for the Micro Four Thirds.

The first one will be (or is) a 25mm f:0.95 that looks like a gorgeous lens.

No way to mount these lenses on an M camera?

 

Here you are some samples:

Voigtländer Nokton 25/0.95 · First image sample - a set on Flickr

 

Thanks.

[viramati]

now that would be something

[wudai_e]

I love how this lens renders, I might even consider just to buy a 4/3 camera so I can use this lens.

 

Newbie question, 25mm on a 4/3 sensor is what focal length on a 35 format?

[doubice]

I saw that Voigtlander will issue a series of lenses for the Micro Four Thirds.

The first one will be (or is) a 25mm f:0.95 that looks like a gorgeous lens.

No way to mount these lenses on an M camera?

Thanks.

 

'No way' is correct. Even if you found an adapter (none available), infinity focus would be impossible. The lens flange to sensor (film plane) distance is shorter on M4/3 than on the M bodies.

 

Newbie question, 25mm on a 4/3 sensor is what focal length on a 35 format?

 

50mm - factor of 2x.

 

Best,

 

Jan

[farnz]

...

50mm - factor of 2x.

 

Best,

 

Jan

it's actually 12.5 mm isn't it, Jan?

 

If you take a 50mm lens in 135 format and place it on a 4/3 camera it will have the effective field of view of a 100 mm lens (ie double) so it stands to reason that a 50 mm lens in 4/3 format would have the effective field of view of 25 mm (ie half) doesn't it?

 

Pete.

[doubice]

it's actually 12.5 mm isn't it, Jan?

 

If you take a 50mm lens in 135 format and place it on a 4/3 camera it will have the effective field of view of a 100 mm lens (ie double) so it stands to reason that a 50 mm lens in 4/3 format would have the effective field of view of 25 mm (ie half) doesn't it?

 

Pete.

 

Pete,

 

Maybe I misinterpreted the original question - I assumed the poster was asking what 'angle of view' would an equivalent of a 4/3 25mm lens have on a full frame camera. The 25mm 4/3 is a 'standard' lens for that format - hence the answer would be 50mm.

 

A 25mm lens is a 25mm lens, as a 50mm lens is a 50mm lens etc. - it does not matter which format it was designed for. What differs, is the angle of view, depending on the sensor size (or film format) and in the case of the 25mm Voigtländer, the image circle.

 

So - the Voigtländer 25mm lens has a focal length of 25mm and as such will have the same angle of view on the 4/3 as a 50mm lens would have on a full frame camera. If you put a 50mm lens on a 4/3 camera, it will have the same angle of view, as a 100mm lens would have on a full frame camera.

 

To put it simply - 2x factor.

 

I know - it does get confusing.......

 

Best,

 

Jan

[farnz]

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Good point, Jan.

 

So, in reality, the output of a 25 mm lens that's designed for the 4/3 format won't fully cover a 36 x 24 mm sensor (or film) although it will still have the same field of view.

 

Pete.

[doubice]

Good point, Jan.

 

So, in reality, the output of a 25 mm lens that's designed for the 4/3 format won't fully cover a 36 x 24 mm sensor (or film) although it will still have the same field of view.

 

Pete.

 

Yes, Pete.

 

If you attached the 4/3 format 25mm lens to a full frame camera, it should theoretically have the same field of view as a 25mm lens designed for full frame. I say theoretically because, the 4/3 format lens will not be able to cover the full 24x36mm frame - it is designed to cover only the 4/3 sized sensor, which is 13x18mm (approx.).

 

Similar rules applied in the days of sheet film cameras: a 90mm lens was the standard focal length for 6x7cm, but it was a wide-angle on a 9x12cm (4”x5”) camera. Lenses designed for 4”x5” had a much larger circle of coverage than those designed for 6x7cm. If you tried using a 90mm Summicron on a 4”x5” camera, the image circle would be even smaller.

 

Best,

 

Jan

[lct]

...Newbie question, 25mm on a 4/3 sensor is what focal length on a 35 format?

As far as field of view is concerned, 25mm on 4/3 is equivalent to 50mm on full frame cameras. At f/0.95, DoF will be close to that of a 50mm lens at f/1.9 on FF cams.

[gyoung]

snip

 

Similar rules applied in the days of sheet film cameras: a 90mm lens was the standard focal length for 6x7cm, but it was a wide-angle on a 9x12cm (4”x5”) camera. Lenses designed for 4”x5” had a much larger circle of coverage than those designed for 6x7cm. If you tried using a 90mm Summicron on a 4”x5” camera, the image circle would be even smaller.

 

Best,

 

Jan

 

On the other hand, I remember reading somewhere that the 135 Elmar (presumably the original one) was a lens designed to cover plates etc. (9x12 cm ?) I wish I still had access to a 5x4 to try out my 135/4 Elmar to see what its like!

 

Gerry