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studio f/stop calculation conversion to real world - need factor

nickalamannickalaman Posts: 196
in Daz Studio Discussion

Does anyone know the conversion factor, if i set my camera to 50mm at an fstop of 2.8 studio, the resulting iray image is way to outof focus. i've got to increase the aperature to around, which makes no sense. does nayone know t he conversion factor?

 

Comments

  • ToborTobor Posts: 2,300

    You set depth of field in the camera settings. It's best to simply ignore what the f/stop value is, and visually set the depth of field on one camera by viewing it sideways with another. Set the camera parameters so the depth lands into the figure you want.

    The f/stop setting in Iray Render Settings has no correlation with the camera, and does not control depth of field. It's merely a way to set the exposure value using familiar photographic controls.

  • nickalamannickalaman Posts: 196

    Thanks,

     

    I was looking at the fstop in the camera setting, I'm aware of how to focus the camera using an other camera from the side. That works quite well, being a photographer I would like to replicate real life scenes and lens combinations. Example., i'd like to shoot a portrait at with an 85mm lens at an aperature of 2.8 from 3 feet away on a 35mm body. That would give me about .7 inches of deapth of field. When I dial the same numbers in studio i get something completely off, at an fstop of 2.8 i get a razor thin dof, nowhere close to reality. In order to get close to what it should look like, i have to dial an fstop close to 25. So i was just wondering of anyone knew the exact number to multiply a real fstop to get the daz equivalent.

     

    So focusing is not a problem, the problem is if I want to get an equivalent  DOF of say a 135mm lens at a fstop of 2.0 from say 5 feet way on a 35mm body. What do i do? because typing these numbers in the camera parameters does not give the expected results. 

     

  • Former DAZ CustomerFormer DAZ Customer Posts: 167

    There doesn't appear to be a correlation.  Your best bet, if you want to reporoduce a particular lens, is to google the lens's manual and consult their DOF chart.  Then you can manually configure your camera's DOF settings to correspond.

  • ToborTobor Posts: 2,300
    nickalaman said:

    So focusing is not a problem, the problem is if I want to get an equivalent  DOF of say a 135mm lens at a fstop of 2.0 from say 5 feet way on a 35mm body. What do i do? 

    As I said, there is no correlation between the f/stops in D|S and standard lenses. A request for this feature been made for years. I doubt it will ever be. If Daz were to change the camera settings to mimic a real camera/lens, it would break every existing scene people have created.

    After a while you get a feel for it. I'm a photographer by trade too, but "real world" values aren't a feature I particularly yearn for. I don't make 3D art with my camera, and I don't take pictures with D|S. Different tools in my mind.

  • bluejauntebluejaunte Posts: 1,922
    nickalaman said:

    Thanks,

     

    I was looking at the fstop in the camera setting, I'm aware of how to focus the camera using an other camera from the side. That works quite well, being a photographer I would like to replicate real life scenes and lens combinations. Example., i'd like to shoot a portrait at with an 85mm lens at an aperature of 2.8 from 3 feet away on a 35mm body. That would give me about .7 inches of deapth of field. When I dial the same numbers in studio i get something completely off, at an fstop of 2.8 i get a razor thin dof, nowhere close to reality. In order to get close to what it should look like, i have to dial an fstop close to 25. So i was just wondering of anyone knew the exact number to multiply a real fstop to get the daz equivalent.

     

    So focusing is not a problem, the problem is if I want to get an equivalent  DOF of say a 135mm lens at a fstop of 2.0 from say 5 feet way on a 35mm body. What do i do? because typing these numbers in the camera parameters does not give the expected results. 

     

    Noticed that too, it's pretty off. Best to just eyeball it to be honest.

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