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08-25-2010, 10:42 AM   #346
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QuoteOriginally posted by Agnostic Quote
Noise comparison impressions from the images in the imaging resource comparometer:

A560 is at least one stop better than the A33 at 1600 and 3200 ISO.

A55 is about half a stop or less worse than the A560 at 1600 and 3200 ISO.

The KX looks similar to the A560 at 1600 and 3200 ISO.

The Sony images look consistently less sharp than those from the KX, looks like jpg smoothing to remove some noise but it could be the lens.

From that I'd say that if the difference for the A560 and A33 hold for the A55 and the K-5 the K-5 should be able to reach Kx high ISO levels or even surpass them slightly by about half a stop max at high ISO.

The A55 also has a much, much cleaner blue channel than the K-7 at all ISO settings. Good news for landscape shooters who like b&w.

Now the wait is for Raw shots!

i'm actually looking forward to a day when most cameras share and standardize on common sensors. then, like the old film days, cameras and camera-makers will be judged only by their glass, service and the individual features and ergonomics of their bodies.

08-25-2010, 10:50 AM   #347
and
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The new sensor has 16mpix, even if the manufacturers improve noise somewhat in each generation they normally eat it up by increasing the amount of mpix. For those who want fantastic iso noise, the best camera is the D3s and that has only 12mpix on a ff sensor, if they used all the latest innovations and made a new 10mpix sensor then presumably it would have quite good noise performance and could also deliver more fps. Already saw in the negatives on the dpr review of the new sony that there was NR killing details over iso 400. I ge the impression a lot of the new cameras has just worse noise performance but better NR software in camera, but if that is the case I can run strong NR on my k7 shots today to get good iso performance.

Last edited by and; 08-25-2010 at 02:15 PM.
08-25-2010, 10:56 AM   #348
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QuoteOriginally posted by wowtip Quote
...or to use f1.4 lenses wide open, without flash in sunshine without ND filters, for really thin DOF.
I wouldn't want to use the FA 50/1.4 wide open unless you want really soft shots.

QuoteOriginally posted by and Quote
The new sensor has 16mpix, even if the manufacturers improve noise somewhat in each generation they normally eat it up by increasing the amount of mpix. For those who want fantastic iso noise, the best camera is the 3Ds and that has only 12mpix on a ff sensor, if they used all the latest innovations and made a new 10mpix sensor then presumably it would have quite good noise performance and could also deliver more fps. Already saw in the negatives on the dpr review of the new sony that there was NR killing details over iso 400. I ge the impression a lot of the new cameras has just worse noise performance but better NR software in camera, but if that is the case I can run strong NR on my k7 shots today to get good iso performance.
Agreed. I wouldn't mind a 12mp sensor in a good semi-pro body if it had improved dynamic range and signal/noise ratios. I still don't understand why no other camera manufacturer has followed up on the Fuji S5. that had a dynamic range of 13.5 like the S3 which was introduced 6 years ago. The only camera that has surpassed that since is the Nikon D3x with 13.7 and that came 4 years after the Fuji S3. They keep adding extra features and upping the MP count but dynamic range has had way to little attention. In fact it decreased from the K20D to the K-7.

Last edited by Agnostic; 08-25-2010 at 11:07 AM.
08-25-2010, 01:50 PM   #349
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QuoteOriginally posted by Steelski Quote
How am I wrong, only 70% of the light gets through, if it was 50% it would be half the light. AKA 1 stop. 70% of light getting through is a loss of 3/5ths of a stop, which is larger than 1/2. It is 60% of a stop light fall off.
I am not wrong. Its just a different way of stating it.
I could state that its more than a 50% of a stop light fall off. which would also be right. Roughly 1/2 a stop is also right, although less accurate.
How could you be wrong? Because your reasoning assumes a linear relationship between % of light loss and the same in stops/Ev. The relation is not linear, its exponential.

30% loss is exactly 0,514573 Ev. 1/2Ev would be 0,5 and 3/5Ev would be 0,6. You tell me which is closer to 0,514573, 0,5 or 0,6, and as such more accurate...

It's not a major issue however. And in practice it's the images that matter.

Wim

08-25-2010, 02:33 PM   #350
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QuoteOriginally posted by Ishpuini Quote
How could you be wrong? Because your reasoning assumes a linear relationship between % of light loss and the same in stops/Ev. The relation is not linear, its exponential.

<snip>

Wim
That's when I get for retiring my K&E slide rule. I forgot I should be doing this with logs.

In general, though, I solved my computation crisis by assuming that all values within a given order of magnitude are about the same. Saves a lot of time but tends to aggravate the IRS.
08-25-2010, 04:06 PM   #351
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Just out of curiosity, why am I seeing some "other forums" mentioning that the K5 would be an "in-between" camera, i.e.: between the K7 and K5?

JP
08-25-2010, 04:11 PM   #352
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QuoteOriginally posted by jpzk Quote
Just out of curiosity, why am I seeing some "other forums" mentioning that the K5 would be an "in-between" camera, i.e.: between the K7 and K5?

JP
Old rumors? I'm pretty sure the K-5 name floated around as the model under the K-7 until the K-r model/rumor came up.
08-25-2010, 04:21 PM   #353
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QuoteOriginally posted by ewalk Quote
Old rumors? I'm pretty sure the K-5 name floated around as the model under the K-7 until the K-r model/rumor came up.
That figures.
I recall having asked why Pentax would call an upgraded camera with a "number" lower than the present "flagship" number (i.e.: from K7, I was probably expecting a "K8" or something like that) and someone here at this forum put me back in my place!
Thanks for the response.

JP

08-25-2010, 04:49 PM   #354
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" wouldn't want to use the FA 50/1.4 wide open unless you want really soft shots."

I use my Pentax 50mm f/1.2 wide open for studio portraiture. That lens performs extremely well in that arena.
08-25-2010, 05:02 PM   #355
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QuoteOriginally posted by jpzk Quote
Just out of curiosity, why am I seeing some "other forums" mentioning that the K5 would be an "in-between" camera, i.e.: between the K7 and K5?

JP
K-5
K-7
K-r
K-x
08-25-2010, 09:21 PM   #356
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If it handles noise at or above the K-x.... I'll be on the next train to K-5 ville
08-25-2010, 10:14 PM   #357
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QuoteOriginally posted by Netsoft Quote
OGL has been quite reliable with his rumors. I personally believed he's the unofficial pentax news release
I don't think so....

How soon - not later, September, 10-15. But it's not 100% true info.
K-R will be first, K-5 is on September, 20.
08-25-2010, 10:51 PM   #358
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QuoteOriginally posted by ogl Quote
I don't think so....

How soon - not later, September, 10-15. But it's not 100% true info.
K-R will be first, K-5 is on September, 20.
some other sites have the release announcments of another brand today with 18mp and apparently a lower price. If the real high ISO numbers of this product work really well there will be value here but otherwise it will be hard to see
this product flying off the shelves at a price higher than than the brard c model 60D announced today. I love pentax---hope they have something up their sleeve.
08-25-2010, 11:41 PM   #359
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QuoteOriginally posted by zackspeed Quote
K-5
K-7
K-r
K-x
That's plenty of model name range for a more pro K-3 and K-1 then
08-25-2010, 11:49 PM   #360
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QuoteOriginally posted by Ishpuini Quote
How could you be wrong? Because your reasoning assumes a linear relationship between % of light loss and the same in stops/Ev. The relation is not linear, its exponential.

30% loss is exactly 0,514573 Ev. 1/2Ev would be 0,5 and 3/5Ev would be 0,6. You tell me which is closer to 0,514573, 0,5 or 0,6, and as such more accurate...

It's not a major issue however. And in practice it's the images that matter.

Wim
Please explain your calculation. I can concede if I am wrong. I would like to learn.
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