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Subject: Poser camera to real world focal length?

ghostship2 opened this issue on Mar 06, 2020 · 11 posts
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ghostship2 ( ) posted Fri, 06 March 2020 at 9:14 AM · edited Fri, 10 January 2025 at 4:01 AM

Somewhere someone (maybe Bagginsbill?) had a formula for figuring out real world lens focal length for the cameras in Poser.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740

bagginsbill ( ) posted Fri, 06 March 2020 at 10:07 AM · edited Fri, 06 March 2020 at 10:15 AM

FOV equivalent

PoserMM * 1.41732283465 = Traditional 35mm film camera

If you desire the FOV of exactly what a real-world 35mm camera would show using a X mm lens, divide by 1.41732283465

So to produce same FOV as a traditional 50mm you would use 35.28 in Poser.

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)

bagginsbill ( ) posted Fri, 06 March 2020 at 10:12 AM · edited Fri, 06 March 2020 at 10:14 AM

Took me a moment to find the original thread archive.

The reason is that Poser simulates (who knows why) that its film is 1 inch (25.4 mm). The ratio to a 35mm camera is 36/25.4

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)

bagginsbill ( ) posted Fri, 06 March 2020 at 10:23 AM

https://www.renderosity.com/mod/forumpro/?thread_id=2886725

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)

ghostship2 ( ) posted Fri, 06 March 2020 at 10:33 AM

Thanks BB! gotta write that down now.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740

ypvs ( ) posted Sat, 07 March 2020 at 7:13 AM

This maybe a slight hijack but does anyone have any suggested settings for a) human eyes b) GoPro camera

I'm thinking the 'sensor' area would be smaller and would need the camera scaling down as well as focal length

Thanks in advance

Poser 11 , 180Gb in 8 Runtimes, PaintShop Pro 9
Windows 7 64 bit, Avast AV, Comodo Firewall
Intel Q9550 Quad Core cpu,  16Gb RAM, 250Gb + 250Gb +160Gb HD, GeForce GTX 1060

ironsoul ( ) posted Sat, 07 March 2020 at 9:01 AM

@ ypvs 50mm focal length with a 35mm sensor is considered roughly equvalent to human vision


ghostship2 ( ) posted Sat, 07 March 2020 at 9:22 AM

Gopro 7 2.92mm equivalent to 16.21mm on a 35mm camera.

ypvs posted at 8:20AM Sat, 07 March 2020 - #4382808

This maybe a slight hijack but does anyone have any suggested settings for a) human eyes b) GoPro camera

I'm thinking the 'sensor' area would be smaller and would need the camera scaling down as well as focal length

Thanks in advance

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740

ghostship2 ( ) posted Sat, 07 March 2020 at 9:23 AM

typical iPhone focal would be around 18.34mm in Poser.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740

pikesPit ( ) posted Sat, 07 March 2020 at 10:21 PM · edited Sat, 07 March 2020 at 10:25 PM

Maybe it's just me? But a "Poser" focal length of 35mm just looks "off" to me, especially in closeups on the face. Having used an analogue SLR camera for the last 40 years, I just "feel" that the Poser FL values are far more closer to what I would get in my old (antique?) Pentax camera. So I still use the standard:

  • 35 mm for landscape
  • 55 mm for snapshots
  • 85 mm for portraits
  • 105(+) mm for zoom

and to my eye the resulting renders look realistic enough compared with what I would expect from a 35 mm film analogue camera.

regards, Peter

P.S. @ Ghostship:

"Eyephones" don't count - they live in their own twisted reality :P 😄 )

ghostship2 ( ) posted Sat, 07 March 2020 at 10:31 PM

https://www.youtube.com/watch?v=Ey_mLj8Edgc

pikesPit posted at 9:30PM Sat, 07 March 2020 - #4382860

Maybe it's just me? But a "Poser" focal length of 35mm just looks "off" to me, especially in closeups on the face. Having used an analogue SLR camera for the last 40 years, I just "feel" that the Poser FL values are far more closer to what I would get in my old (antique?) Pentax camera. So I still use the standard:

  • 35 mm for landscape
  • 55 mm for snapshots
  • 85 mm for portraits
  • 105(+) mm for zoom

and to my eye the resulting renders look realistic enough compared with what I would expect from a 35 mm film analogue camera.

regards, Peter

P.S. @ Ghostship:

"Eyephones" don't count - they live in their own twisted reality :P 😄 )

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740

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