PIX 2015

WOW what a game changer A7s

Started Apr 6, 2014 | Discussions thread
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Ontario Gone
Senior MemberPosts: 4,183Gear list
Re: you forgot to tell us WHY more megapixels better
In reply to RussellInCincinnati, Apr 8, 2014

RussellInCincinnati wrote:

RussellInCincinnati: In contrast, there are no reasons why smaller pixels will de*crease noise for a given sensor readout after a given exposure time. *_Please let me know if this is not true, am eager to learn._

Ontario: Well then perhaps DXO needs a lesson too, as well as Sony themselves because everything you said is being contradicted by tests.

I didn't ask about test results, which test entire manufactured camera body systems and could reflect different sensor technologies. For example a company might use better sensor technology in a higher megapixel camera in order to give lower noise overall, EVEN THOUGH the higher megapixel count in and of itself increases read noise.

I.e. you are avoiding my question. Which is why do you predict that the lower-megapixel Sony A7s can't have significantly better low light noise when the company says the thing has it, and when all the theoretical technical factors predict that larger pixels deliver decreased noise?

What is one technical reason that a higher megapixel camera decreases noise? If you can't think of one technical reason, than why would someone without agenda speculate that the new Sony camera doesn't have lower noise in dim light, as the company claims. Particularly since we can effortlessly think of several technical reasons why a lower megapixel camera should have lower noise at the same level of sensor technology.

P.S. Ontario I liked your low light sample, particularly your subject's apparent cynicism about the photographic process.

Ty for the photo compliment, she must be one of the most photographed dogs around. As to your question, i think the lower read noise of less MP CAN make a difference (but like i said, it's extremely small), my point however is that since we are not buying just a sensor, that doesnt necessarily matter. In the end the A7s could be superior or inferior in noise performance, and buying a camera with expectations for noise based on resolution is an exercise in disappointment.  If we look at past models with differing rez, we can see this.

I think their assertion that the A7s will have less noise pertains to video not stills, but they are not going to advertise that. Sony is a company and they want to sell product. It will be interesting to see samples once it launches.

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"Run to the light, Carol Anne. Run as fast as you can!"

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