A new Kodak dcs pro srl/n sensor filter

Started Jul 11, 2012 | Discussions thread
bassotto
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errata corrige focus shift calculation
In reply to bassotto, Jul 12, 2012

bassotto wrote:

since the refractive index of 0.7mm thick Schott S8612 is 1.54 and the new glass filter is probably a Sodalime glass and the RI should be 1.52:
((1.54-1) 1.54)x0.7=0.2454545 and
((1.52-1)
1.52)x0.55=0.1881578 so
0.2454545-0.1881578=0.0572967mm of Focal shift backwards
the sensor has to be shifter forward of 0.0572967mm!

It means 5mm/100 and consider the DoF
DoF calculator
http://www.dofmaster.com/dofjs.html
and the CoC etc etc......

with my 55mm micro at f16 and 10cm from subject or with sekor 180mm and bellows at (improbably) f4,5 and 55cm from the same subject I can nullify the DoF of 0.05mm behind the subject and gain 0.10mm in front of it, isn't it?

really should be 0.057mm inside a DoF of 0.05cm=0.50mm behind and in front of a subject so........isn't it?

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