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05/25/2007 05:48:38 PM · #26 |
Originally posted by TechnoShroom:
Originally posted by silverfoxx:
Originally posted by quiet_observation:
Try a view camera. |
what is a view camera? |
This would be one example. |
oh wow:) loks interesting though |
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05/25/2007 05:56:08 PM · #27 |
OK.. forget lens aberrations and just "focus" on DOF. LOL!!!!
I'll try saying this one more time, then I will shut my big fat mouth.
DOF is a function of lens focal length, distance from lens to object and aperture. Sensor size is NOT a variable in that function. It never has been.
A 70mm lens at f/8 and 10 meters from the object has EXACTLY the same DOF regardless of the camera used or the sensor size of the detector that the camera has.
The confusion about this is caused by camera manufacturers who speak in 35mm "equivalents" to make their products look good. Physics doesn't mean anything to them. :)
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05/25/2007 06:00:20 PM · #28 |
Originally posted by stdavidson:
OK.. forget lens aberrations and just "focus" on DOF. LOL!!!!
I'll try saying this one more time, then I will shut my big fat mouth.
DOF is a function of lens focal length, distance from lens to object and aperture. Sensor size is NOT a variable in that function. It never has been.
A 70mm lens at f/8 and 10 meters from the object has EXACTLY the same DOF regardless of the camera used or the sensor size of the detector that the camera has.
The confusion about this is caused by camera manufacturers who speak in 35mm "equivalents" to make their products look good. Physics doesn't mean anything to them. :) |
Yes, okay, I'm just going from the thought of medium format and large format not having the same framing at the same focal lengths. So to get the same equivalent framing you do have to change focal lengths, and as you said that is what changes the DOF, not technically the size of the sensor. |
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05/25/2007 06:05:00 PM · #29 |
Originally posted by stdavidson:
OK.. forget lens aberrations and just "focus" on DOF. LOL!!!!
I'll try saying this one more time, then I will shut my big fat mouth.
DOF is a function of lens focal length, distance from lens to object and aperture. Sensor size is NOT a variable in that function. It never has been.
A 70mm lens at f/8 and 10 meters from the object has EXACTLY the same DOF regardless of the camera used or the sensor size of the detector that the camera has.
The confusion about this is caused by camera manufacturers who speak in 35mm "equivalents" to make their products look good. Physics doesn't mean anything to them. :) |
The *actual* DoF and the *apparent* DoF might be different, however, because using the same lens on the same subject at the same distance with different sensor sizes will result in different frames with visual appearances. Mathematically speaking, the DoF is identical. |
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05/25/2007 06:15:08 PM · #30 |
Originally posted by wavelength:
Yes, okay, I'm just going from the thought of medium format and large format not having the same framing at the same focal lengths. So to get the same equivalent framing you do have to change focal lengths, and as you said that is what changes the DOF, not technically the size of the sensor. |
On this we agree 100%. :)
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05/25/2007 06:19:37 PM · #31 |
| If any uber-geeks want some calculus to go along with the discussion, Have at it! |
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05/25/2007 06:58:38 PM · #32 |
Originally posted by wavelength:
If any uber-geeks want some calculus to go along with the discussion, Have at it! |
No calculus there :-(
Just a little basic Algebra. |
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05/25/2007 07:02:17 PM · #33 |
Originally posted by kirbic:
Originally posted by wavelength:
If any uber-geeks want some calculus to go along with the discussion, Have at it! |
No calculus there :-(
Just a little basic Algebra. |
I haven't done either for years, so It's all the same at this point ;) |
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