30mm sigma art = 50mm FF: Micro Four Thirds Talk Forum: Digital Photography Review

30mm sigma art = 50mm FF

Started Aug 1, 2015 | Discussions

(unknown member) • Forum Pro • Posts: 19,317

30mm sigma art = 50mm FF

Aug 1, 2015

after a lot of research and testing I decided on the sigma 30mm art and picked it up new from a local shop for $150. I tested my old pentax FF film camera with a 50mm prime and the 14 42 kit lens set to 30 mm and the FOV was exactly the same , after getting home just now the sigma is also exactly the same. I also looked up the DOF charts for the 25 1.8 and at 10ft both the sigma stopped at 2.8 and the 25 oly stopped at f2.o had identical DOF , so im a pretty happy chappy saving a few dollars on the way to a perfect combo EM5 + 30mm art. as a 50mm equivalent.

cheers don

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Pentax k7,fz150,xz1, oly m43 e-pL5 , EM5 my toys.
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OP (unknown member) • Forum Pro • Posts: 19,317

Re: 30mm sigma art = 50mm FF

In reply to (unknown member) • Aug 1, 2015

I thought this would have been a good topic to discuss ? has this been brought up before ?

cheers don

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Jon Schick • Veteran Member • Posts: 5,163

Re: 30mm sigma art = 50mm FF

In reply to (unknown member) • Aug 1, 2015

Not quite - it's the equivalent of 60mm field of view but I agree it's a great lens...I have one too, and also highly recommend its longer 60mm sibling.
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OP (unknown member) • Forum Pro • Posts: 19,317

Re: 30mm sigma art = 50mm FF

In reply to Jon Schick • Aug 1, 2015

Jon Schick wrote:

Not quite - it's the equivalent of 60mm field of view but I agree it's a great lens...I have one too, and also highly recommend its longer 60mm sibling.
--
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No its not ! its 50 mm, have you got a FF with a fifty on it, its the same FOV. I have the 60 and its awesome as well.

cheers don

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Pentax k7,fz150,xz1, oly m43 e-pL5 , EM5 my toys.
http://www.dpreview.com/galleries/9412035244

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yahoo2u • Contributing Member • Posts: 715

Re: 30mm sigma art = 50mm FF

In reply to (unknown member) • Aug 1, 2015

Donald B wrote:

Jon Schick wrote:

Not quite - it's the equivalent of 60mm field of view but I agree it's a great lens...I have one too, and also highly recommend its longer 60mm sibling.
--
http://thephotographersblock.wordpress.com
http://jonschick.smugmug.com/

No its not ! its 50 mm, have you got a FF with a fifty on it, its the same FOV. I have the 60 and its awesome as well.

cheers don

30x2=60.

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MOD Tom Caldwell • Forum Pro • Posts: 46,353

Re: 30mm sigma art = 50mm FF

In reply to (unknown member) • Aug 1, 2015

Donald B wrote:

Jon Schick wrote:

Not quite - it's the equivalent of 60mm field of view but I agree it's a great lens...I have one too, and also highly recommend its longer 60mm sibling.
--
http://thephotographersblock.wordpress.com
http://jonschick.smugmug.com/

No its not ! its 50 mm, have you got a FF with a fifty on it, its the same FOV. I have the 60 and its awesome as well.

cheers don

Well sometimes lens manufacturers round up or round down their lens labelling to suit "known" lens focal length steps. As the Sigma Art lens was designed for aps-c use I would not be surprised if it did not exactly convert to a precise "30" and there is also no telling whether your FF "50" is precisely a "50" as there were quite a few "55" lenses on offer and presumably some were in-between and labelled "50" for convenience and market acceptance. Nobody is going to worry much if the lens on their camera is truly a 52.6mm and not a precise 50mm.

In any case "50-60" in FF terms, it is an academic exercise - it is a good lens any which way.

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Tom Caldwell

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OP (unknown member) • Forum Pro • Posts: 19,317

Re: 30mm sigma art = 50mm FF

In reply to Jon Schick • Aug 1, 2015

Jon Schick wrote:

Not quite - it's the equivalent of 60mm field of view but I agree it's a great lens...I have one too, and also highly recommend its longer 60mm sibling.
--
http://thephotographersblock.wordpress.com
http://jonschick.smugmug.com/

I razed the topic as like me was looking for 50mm ff and thought the 30 would be a bit to close, but to my surprise it was exactly the same ?

cheers don

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Pentax k7,fz150,xz1, oly m43 e-pL5 , EM5 my toys.
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OP (unknown member) • Forum Pro • Posts: 19,317

Re: 30mm sigma art = 50mm FF

In reply to Tom Caldwell • Aug 1, 2015

Tom Caldwell wrote:

Donald B wrote:

Jon Schick wrote:

Not quite - it's the equivalent of 60mm field of view but I agree it's a great lens...I have one too, and also highly recommend its longer 60mm sibling.
--
http://thephotographersblock.wordpress.com
http://jonschick.smugmug.com/

No its not ! its 50 mm, have you got a FF with a fifty on it, its the same FOV. I have the 60 and its awesome as well.

cheers don

Well sometimes lens manufacturers round up or round down their lens labelling to suit "known" lens focal length steps. As the Sigma Art lens was designed for aps-c use I would not be surprised if it did not exactly convert to a precise "30" and there is also no telling whether your FF "50" is precisely a "50" as there were quite a few "55" lenses on offer and presumably some were in-between and labelled "50" for convenience and market acceptance. Nobody is going to worry much if the lens on their camera is truly a 52.6mm and not a precise 50mm.

In any case "50-60" in FF terms, it is an academic exercise - it is a good lens any which way.

I just put a 40mm prime on my ff pentax and its equal to 25mm on my epl5.

Interesting isn't it, I have 10 50mm primes and it the same on all of them.

cheers don

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Pentax k7,fz150,xz1, oly m43 e-pL5 , EM5 my toys.
http://www.dpreview.com/galleries/9412035244

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adamandbean • Contributing Member • Posts: 615

Re: 30mm sigma art = 50mm FF

In reply to (unknown member) • Aug 1, 2015

I have playefd with that lens in a shop-very nice

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peppermonkey • Veteran Member • Posts: 5,204

FF Pentax as in film Pentax SLR?

In reply to (unknown member) • Aug 1, 2015

Donald B wrote:

I just put a 40mm prime on my ff pentax and its equal to 25mm on my epl5.

Interesting isn't it, I have 10 50mm primes and it the same on all of them.

cheers don

I could be wrong but I think I read somewhere that the Oly 25mm is a tinsy bit wider than the Panny 25mm...though I may have mistaken those lenses with two totally different Oly and Panny lenses

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Hubert
My non-digital gear: Agfa Isolette, Ricoh Ricohflex VII, Voigtlander Bessa R, Voigtlander Bessa L, Zorky 4, Fed 2, Konica Big Mini, Konica Auto S2, Pentax K1000, Yashica Electro 35 GX, Recesky
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Henry Richardson • Forum Pro • Posts: 21,959

3:2 aspect ratio and 4:3 aspect ratio

In reply to (unknown member) • Aug 2, 2015

Your 35mm SLR has a 3:2 aspect ratio and your m4/3 has a 4:3 aspect ratio.

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OP (unknown member) • Forum Pro • Posts: 19,317

Re: 3:2 aspect ratio and 4:3 aspect ratio

In reply to Henry Richardson • Aug 2, 2015

Henry Richardson wrote:

Your 35mm SLR has a 3:2 aspect ratio and your m4/3 has a 4:3 aspect ratio.

which way do you think is 50 mm ? landscape or portrait.

cheers don

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captura • Forum Pro • Posts: 27,478

Re: 30mm sigma art = 50mm FF

In reply to Tom Caldwell • Aug 2, 2015

Tom Caldwell wrote:

Donald B wrote:

Jon Schick wrote:

Not quite - it's the equivalent of 60mm field of view but I agree it's a great lens...I have one too, and also highly recommend its longer 60mm sibling.
--
http://thephotographersblock.wordpress.com
http://jonschick.smugmug.com/

No its not ! its 50 mm, have you got a FF with a fifty on it, its the same FOV. I have the 60 and its awesome as well.

cheers don

Well sometimes lens manufacturers round up or round down their lens labelling to suit "known" lens focal length steps. As the Sigma Art lens was designed for aps-c use I would not be surprised if it did not exactly convert to a precise "30" and there is also no telling whether your FF "50" is precisely a "50" as there were quite a few "55" lenses on offer and presumably some were in-between and labelled "50" for convenience and market acceptance. Nobody is going to worry much if the lens on their camera is truly a 52.6mm and not a precise 50mm.

In any case "50-60" in FF terms, it is an academic exercise - it is a good lens any which way.

The Sigma 30mm lens for the APS-C Sony NEX series produces 1.5 X 30 = 45mm FF equivalent, for what it's worth. It is pretty much identical to the Sigma 30 for M43, except that the mount and concomitant registry distance is suitably changed.

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30mm sigma art = 50mm FF

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