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New Voigtlander Nokton 50mm f/1.2 Aspherical
#12
Just what I said. With digital, light gets lost with light hitting at steeper angles at the micro lens structures. You see this as vignetting with (U)WA lenses, and light loss at large apertures. With every f1.2 lens you won't get f1.2 worth of light. Or: with every T1.3 lens you won't get T1.3 worth of light. Reason: the micro lens structure. You can test this yourself: put your f1.4 lens on your 5D. Use a fool proof metering mode, and meter what light it needs wide open. Now disconnect the lens a bit so that the contacts don't make a connection. Now the camera does not know it has a 50mm f1.4 lens. Meter again. You will notice a slightly different (longer) exposure time.

With bigger apertures, Canon amplifies the signal extra to hide the confusing fact of light loss at microlens level with big apertures which does not cause is shorter exposure times even though you do use a larger aperture which does allow more light to get through.

Hence: you can't say that that 35mm f1.2 has the same T-stop as the 35mm f1.4 because the exposure times are similar.
  


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RE: New Voigtlander Nokton 50mm f/1.2 Aspherical - by Brightcolours - 07-23-2018, 01:41 PM

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