why not f/1.2 by Sony?

Started May 14, 2013 | Discussions thread
EinsteinsGhost Forum Pro • Posts: 11,977
Re: why not f/1.2 by Sony?

stan_pustylnik wrote:

EinsteinsGhost wrote:

stan_pustylnik wrote:

EinsteinsGhost wrote:

stan_pustylnik wrote:

TiagoReil wrote:

quezra wrote:

captura wrote:

Instead of concentrating on bigger f1.2/1.4 lenses, they could just make sure that OSS is installed in most of the new ones including the new Zeiss lenses. Stabilization is worth about 2 f-stops, anyhow.

Well the things OSS don't help with are DoF and shutter speed which is still necessary for fairly common objects of photography (e.g. active children).  But yes, for anything static OSS is just fine.

IF you cant get children moving with an 1.8 lens cause of speed, then you wont get them with a 1.2 too. Remember that is a stop of light, and not even that, probably it is that a 60, 70 % of a stop of light cause of the sensor problem. So with a 60%, 70%, you really think you will get those kits moving static? It is not enough. Yes, everything counts, but if you got movement at 1.8, you are still are going to get it at 1.2

There is big difference in 1 stop for indoor photography where benchmark lenses f/1.2; f/1.4 rule, difference between 8", 4", 2", 1", 2, 4, 8, 15, 30, 60, 125, 250, 500, 1000, 2000 is huge.

  • 1/1000 s
  • 1/500 s
  • 1/250 s
  • 1/125 s
  • 1/60 s
  • 1/30 s
  • 1/15 s
  • 1/8 s
  • 1/4 s
  • 1/2 s
  • 1 s

Shutter speed comes down, not to f-stop but, to t-stop. So, what might seem like a 1-stop advantage going from f/1.2 to f/1.8, might shrink to 1/2-2/3 stop.

Please compare your info to:


I guess, that explains why you have absolutely no interest in understanding if t-stop matters.

why not, I see information here: http://en.wikipedia.org/wiki/T-stop#T-stop

It still doesn't explain why Sony doesn't build f/1.2 and f/1.4 lenses for NEX, that seems to be major milking cow for Sony.

For bragging rights, it could. But, at a time when you're needs are to complete a sensible lineup for NEX buyers, it would be stupid to put resources on something overly expensive without the benefits to show for. Okay, there might be a few who would buy f/1.8 because Sony is now building f/1.2... At this point, it makes ZERO sense. I would rather see 85mm f/2 next and a zoom lens or two that open up more a bit. This would explain why Sigma would offer a f/2.8 trio first, before thinking f/1.4 or so. Its about getting your priorities right.

As for t-stop, go past just reading about these articles on Wiki. And then you might learn that the improvement in shutter speed (as your first source suggested, and you were running around with it), is not linear. The benefits are negligible, except on paper.

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