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Thread started 21 Jun 2011 (Tuesday) 14:59
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Plenoptic camera?

 
focus.pocus
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Jun 24, 2011 23:02 |  #106

wow... another new member with an article about this camera... and amazingly they all have 67 posts... hmmmmm


I know, right? I'm just sayin'...

  
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C ­ Scott ­ IV
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Jun 26, 2011 12:08 |  #107

Do I dare post as a "new member?" This will be very interesting to watch.

There seems to be a cool social networking side to this that will no doubt not appeal to everyone. As an amateur, if I compose a shot a certain way, that was my intent and that is what I want to provide the viewer. When I used to use all AF points there were shots where focus was on the wrong subject. The refocus option would have been welcome.

I haven't read each and every article but what is interesting to me is that most of the focus is on focus. Not much is said about exposure or dynamic range in the mainstream. For exposure it looks like they are automatically bracketing and merging just like we do except within one exposure. That can be a good thing for the P&S crowd. Maybe not so much for for those how want control over that.

Reference is made to it being good in low light. It makes sense that a combination of auto bracketing in a single exposure and auto ISO for low light would reduce the amount of camera shake. There almost have to be some limitations there.


Charles
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wimg
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Jun 26, 2011 13:53 |  #108

C Scott IV wrote in post #12660293 (external link)
Do I dare post as a "new member?" This will be very interesting to watch.

There seems to be a cool social networking side to this that will no doubt not appeal to everyone. As an amateur, if I compose a shot a certain way, that was my intent and that is what I want to provide the viewer. When I used to use all AF points there were shots where focus was on the wrong subject. The refocus option would have been welcome.

I haven't read each and every article but what is interesting to me is that most of the focus is on focus. Not much is said about exposure or dynamic range in the mainstream. For exposure it looks like they are automatically bracketing and merging just like we do except within one exposure. That can be a good thing for the P&S crowd. Maybe not so much for for those how want control over that.

Reference is made to it being good in low light. It makes sense that a combination of auto bracketing in a single exposure and auto ISO for low light would reduce the amount of camera shake. There almost have to be some limitations there.

Yes, there are several limitations:
1) it uses the image projected by the main lens for recording an image by its system, which means there is an extra step involved, lowering total resolution and adding aberrations.
2) each of its lenses cover a set of sensels on the sensor, which effectively means that in order to get the same resolution as an average compact camera, you really need 100+ MP.
3) each of its lenses which capture the images introduce further aberrations etc.
4) aperture of the lenses which capture the images is F/4, which means that it works optimally with the aperture of the main lens set to F/4, smaller means underexposing an image, more means overexposing, effectively anyway (and this seems independent of iso settings).

When the lens array used covers 25 sensels, the resolution used is reduced by a factor 5 linear (square root of surface elements covered). IOW, a 12 MP compact camera capable of producing a 3000 X 4000 pixel images, now will yield a 0.48 MP image, or 600 X 800 pixels. Using less sensels per group increases resolution, but for optimal refocus possibilities, you need as many sensels as possible per group, and as many groups as possible - there is a balance there somewhere.

This, IMO, is the real reason why this approach will be used for consumer cameras first, and I understand they will generate 2 MP images at first (sensor size wrt MP I dont know). This is genrally not enough for those who want to do larger format printing, but is plenty for web viewing and small prints, IOW, for the consumer industry.

HTH, kind regards, Wim


EOS R & EOS 5 (analog) with a gaggle of primes & 3 zooms, OM-D E-M1 Mk II & Pen-F with 10 primes, 6 zooms, 3 Metabones adapters/speedboosters​, and an accessory plague

  
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Bokehlicious
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Jun 28, 2011 22:39 |  #109

Here's the CEO of Lytro talking about the light-field camera technology on the BOL podcast
http://www.youtube.com …tPnuz-rO-Rg&feature=feedu (external link)

pretty interesting




  
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Plenoptic camera?
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