Joseph S Wisniewski

Lives in United States Detroit, MI, United States
Works as a Speech and sensor scientist
Has a website at http://www.swissarmyfork.com
Joined on Jul 12, 2002
About me:

I've been in love with photography for over 50 years.

My favorite form of photography is macro, and much of my gear is of my own design.

I've done professional photography on and off for over 20 years.
Taught 8 years at Midwest Photography Workshops.
Designed 3 scientific digital cameras and 7 lenses.

Author of mImage and (coming soon to the App Store and Google Play) ColorForEveryone.

Comments

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Alex Panoiu: From page 60 of the thesis (http://www.lytro.com/renng-thesis.pdf) I understand that if each microlens covers m x m pixels and the image was taken at f/N then the image can be refocused anywhere in the depth of field of f/(N x m). For example, the image taken at f/4 and each microlens covers 8x8 pixels then the image can be refocused anywhere in the depth of field of f/32. This also means that spatial resolution is reduced by a factor of 256, say from 256 megapixels to 1 megapixel.

The tradeoff is that for each factor of 2 of loss in spatial resolution the "potential" depth of field increase corresponds with one step of aperture.

N-1, actually. Elsewhere in his thesis, Ren Ng comments that it's not possible to get the last stop of DOF out of a real system.

So, the f4 lens, 8x8 pixel microlens system gives you DOF from f4 to f16, not f32.

Link | Posted on Jun 23, 2011 at 14:51 UTC
On article Content commenting system launched (128 comments in total)

But will it hold together when a controversial news item gets 50,000 comments?

Link | Posted on Jun 22, 2011 at 20:52 UTC as 42nd comment
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