Fuji QuickSnap disposable focus distance

[marcinwuu]

<p>Does anyone know what's the actual focal distance the disposable QuickSnap is set to?</p>

[Colin O]

<p>According to the specs <a href="http://www.fujifilm.com/products/quicksnap/lineup/superia/">here</a>, the 'QuickSnap Superia' has a 32mm f/10 lens, with depth of field from 1m to infinity. Depending on the size of the circle of confusion that Fujifilm used in the depth of field calculations, I calculate that you would get such depth of field with a 32mm f/10 lens with a focal distance of approx 2.15m to 2.4m or thereabouts.</p>

[glen_h]

<p>The math is well known:<br>

https://en.wikipedia.org/wiki/Hyperfocal_distance<br>

so it is reasonable to assume that Fuji knows it.</p>

<p>As far as I know, you should use the circle of confusion that comes from the aberations of the lens, and so likely larger for a cheap plastic lens than a top quality multi-element glass lens. Otherwise, no less than the diffraction limit.</p>

[marcinwuu]

<p>Thanks a lot.<br>

Should've figured this out by myself by the way, must be the age chipping away at the gray cells...</p>

[glen_h]

<p>No problem.</p>

<p>It is one thing that you sort of know, but it was not so long ago that I read the actual description, and actual math.</p>

<p>I went to a talk by someone from Lytro a few years ago. I think that had some discussion on focal distances and depth of field. For even more details, read the paper on the Lytro web site that is the PhD thesis of the founder.</p>