[biz-engineer]

As I said, the 645z can meet and exceed it's expected performance by reusing K-3's AF - they didn't had to develop an entirely new AF system. It's a highly competitive product.

That's what I wanted to say, so, one person understood at least.

[i5_david]

36 ÷ 1,5 ^ 2 = 16.

Both the length and the width of the sensor being 1.5 times smaller, the area, and consequently the pixel number, is 2.25 times smaller.

Grazie mille! Makes sense to me. Good explained 👊

[pathdoc]

My K-5 can do ISO 80 in expanded sensitivity mode. Surely you're not telling me that the K-1 can't do better?

Oh well. I'll forgive almost anything for aperture coupling and TTL flash. I await the official release to see what exactly this beast of a camera has inside it.

[Chris Mak]

You don't understand my post. I can repeat


Nikon D810 has marked ISO100 and ISO64. And even ISO32. But ISO32 is already not real - "software ISO".
ISO64 is "hardware ISO". IT'S TRUE ISO.

D810 with ISO64 allow to make photo with exposure as real ISO47. DR is 14.76EV.

Don't forget that cameras have the highest DR at real low ISO. My K-5IIs at ISO80 is 1 STOP better than at ISO200.



Low ISO means highest DR, lowest noise and highest resolution. ISO50 is just symbolic ISO in our discussion.
Will K-1 have ISO lower than 100 or not?

80, 64 or 50...Don't care which one.

Yes,
This is what makes the D810 different from the D800 or the Sony A7r.
A true base iso of iso 47 would be a pretty significant pré for e.g. landscape photographers when they shoot in bright daylight.
As far as I know though, this type of sensor is more expensive to produce because it requires a larger Full Well Capacity.
So it is not at all a given that the Pentax K1 will have a competitive sensor to the D810.

Chris

[monochrome]

And that's another straw man argument (do we see a pattern?). The claim was made, and applies to Pentax' medium format cameras.

That's a tactic. When you've lost the point, redirect the argument.

[biz-engineer]

So it is not at all a given that the Pentax K1 will have a competitive sensor to the D810.

I don't know what the sensor will be. It might be a nice differentiation for Pentax FF if it was the 42Mp BSI because it would be the only DSLR having the best FF sensor at the time of its release. But if it is a 36Mp sensor, it will be for it unit cost, this 36Mp CMOS sensor may now be available for relatively cheap since it was most probably produced for a while , cost optimized (production yield improvement and other cost optimizations), and performance wise wouldn't be so different from the 42Mp BSI. It depends if Ricoh decided to try an attack on market share by offering the cheapest best spec ff of the market (something like $2K). But if the sensor is a D800E sensor and Pentax FF priced at >$3K, it's going to sell to Pentaxians, but that's all.

[MarkJerling]

Those specs will do nicely.

[Kunzite]

We already know the price.

[beholder3]

With 1/8000 shutter speeds ISO 50 has only niche applications all by itself.

There is only one important item here: that is the max dynamic range.

If that can be achieved at ISO 100 instead of ISO 50 that is even better.

And if the K-1 outperforms the D810 (which itself hugely outperforms the APSC level Sony A7RII in max DR) even at ISO 100 that is better than better.

I want the biggest possible max dynamic range (for shots with bright light and deep shadows).
And I want this available at a moderate ISO, since if I can only get it as ISO 50 such as in the D810 I need slower shutter speeds to get there.

Give me 15 stops of DR at ISO 100 and I am going to be a very happy user.

[MJSfoto1956]

if the K-1 can do 6.5 fps with a big buffer, I'll be a happy camper. My D800 does 4 fps and that would be a nice upgrade indeed. I'm also a fan of SD cards -- much more convenient than CF cards. + for Pentax.

Michael

[monochrome]

That's what I wanted to say, so, one person understood at least.

i understood what you actually said.

But the discussion is meaningless. The FF will apparently have new VF features and an improved AF system (and improved IBIS for telephoto lenses).

The production plan for 645D was 10,000 units over three years. The production plan for 645Z was amended and increased dramatically to meet demand (20,000 units in pre-order alone).

I imagine the FF production plan is higher, so the R&D will spread over more primary units, plus likely the next flagship APSc, at least.

[Ian Stuart Forsyth]

Yes,
This is what makes the D810 different from the D800 or the Sony A7r.
A true base iso of iso 47 would be a pretty significant pré for e.g. landscape photographers when they shoot in bright daylight.
As far as I know though, this type of sensor is more expensive to produce because it requires a larger Full Well Capacity.
So it is not at all a given that the Pentax K1 will have a competitive sensor to the D810.

Chris

I would not be surprised if the D810 was built to specific requirements that Nikon was aiming for and willing to pay more for that FWC

[jaad75]

If it does 6.5 fps in full frame mode, it does not have an old IMX094 inside definitely. Hopefully it's not just another rumor.

BTW, the D810 doesn't have 14.8EV dynamic range - you should look at "Screen" results instead of "Print" (which is downscaled to 8MPix). It goes up to 13.67EV at the lowest ISO.

[discharged]

We already know the price.

That is a bit strong. We do not know the price, we have rumors and info from members that their sources has told them the same or similar (asahi man and kenspo primarily) my own sources are quiet as can be, probably because they have no info to give at this time. And still, the price might be different from the one we have here

[darylk]

I'm guessing that the K-1 will have a new focus array sized for the sensor. The next gen 645 would then either inherit the K-1's array (the low cost but adequate approach) or have one specifically designed for the format, which might be worth the investment given the sales success of the 645z.