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04-29-2009, 06:05 AM   #1396
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QuoteOriginally posted by dopeytree Quote
I don't think 38.6 Mbits/sec is going to have chunky artefacts eh?
No, it doesn't and it as good as it gets in any consumer product right now.

However, this is only 206 kB per frame. Assuming the time compression makes for about 50% over still images, this is about 400kB per frame.

My average K20D image, when resized to 1080p, requires JPG compression quality 7/12 (in PS) to become about as big.

Attached is a comparison of qualities:

- Original 1:1 (100%) crop from K20D
- Uncompressed, but resized to 1920 width
- Compressed at JPG quality 7/12 (medium), as to be expected at 38.6 Mbits/sec bitrate.

The latter two have been resized to the original resolution of the K20D. They look better before the upscale, of course. But also making the comparison harder.

So, the smaller size and the compression both do their bad on IQ. The resizing about as much as the compression.

Note that consumer HD camcorders record at much lower bitrates!


P.S.
What is the Bluray spec?
A 2h movie stored on 50GB Bluray translates to 56 Mbits/sec ... (without the audio and the specials)


Last edited by falconeye; 06-15-2011 at 05:28 AM.
04-29-2009, 06:07 AM   #1397
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QuoteOriginally posted by ogl Quote
50% of Pentaxian will be gone into ecstasies, 30% will grumble...
20% will stay with old cameras...I guess...

Maybe I'm wrong...
I believe 50% of the Pentaxians will go "Pentax is doomed, they have got it wrong again, why doesn't it have x instead of y? Why can't Pentax get things right?". Of those, 30% will jump ship beacuse the camera is "too small", but on the other hand we will get many new Pentaxians coming over from Canon because "Canon is too big".

15% of the users will complain about the lack of a pink colour scheme for the outer design, and 23% will say "K20D is a much better looking body" and another 23% will complain about the position of the green button, but 18% will compalin about the existence of a green button and 43% will be confused about the lack of an Fn-button. "Why has Pentax changed the ergonomics? Now I must learn a new way of pressing buttons!". Of course 32% will complain about the direct access to ISO, of those 32%, about 89% has misinterpreted how ISO is set, and 43% thought ISO was always set to ISO 12800, but 20% asks the question - "where is the button for the ASA setting?"

12% of the first buyes will have the camera serviced because "couldn't get the camera to accept my Fuji Velvia slide film in the SD card slot".

14% will have tried to open the K7 in a darkroom and putting the SD card onto the film development tray, and then phoning Pentax service about how many minutes it should stay in the developer because still after 15 minutes there is no glimps of an image being showned on the card..
04-29-2009, 06:12 AM   #1398
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QuoteOriginally posted by RMabo Quote
I believe 50% of the Pentaxians will go "Pentax is doomed, they have got it wrong again, why doesn't it have x instead of y? Why can't Pentax get things right?". Of those, 30% will jump ship beacuse the camera is "too small", but on the other hand we will get many new Pentaxians coming over from Canon because "Canon is too big".

15% of the users will complain about the lack of a pink colour scheme for the outer design, and 23% will say "K20D is a much better looking body" and another 23% will complain about the position of the green button, but 18% will compalin about the existence of a green button and 43% will be confused about the lack of an Fn-button. "Why has Pentax changed the ergonomics? Now I must learn a new way of pressing buttons!". Of course 32% will complain about the direct access to ISO, of those 32%, about 89% has misinterpreted how ISO is set, and 43% thought ISO was always set to ISO 12800, but 20% asks the question - "where is the button for the ASA setting?"

12% of the first buyes will have the camera serviced because "couldn't get the camera to accept my Fuji Velvia slide film in the SD card slot".

14% will have tried to open the K7 in a darkroom and putting the SD card onto the film development tray, and then phoning Pentax service about how many minutes it should stay in the developer because still after 15 minutes there is no glimps of an image being showned on the card..

Hahahhahahahaha so true

You forgot all those wanting their old m lenses to auto meter
04-29-2009, 06:14 AM   #1399
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QuoteOriginally posted by Torphoto Quote
I knew more info would leak out but some of the specs are scarey, partially not believeable like the 5fps and 77 metering zones. I would believe 3.5fps with a 5 fps 6mp mode yes..
5 fps is real, but not with highest resolution, still more resolution than the limited 20 fps burst mode in the K20D. Should work for most things.

77 metering zones, yes.
Why not? 16 zone evaulative metering is old now. The others has gone past 16 zones for decades ago...

04-29-2009, 06:16 AM   #1400
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QuoteOriginally posted by dopeytree Quote
I would love WR in all my lenses especially in the limiteds!
Will not happen, the seals takes up too much space. Limiteds are meant to be the smallest lenses on the market. They would be too big with all the rubber seals inside and outside.
04-29-2009, 06:17 AM   #1401
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QuoteOriginally posted by falconeye Quote
I
- No contrast AF (Even Canon 5DmkII cannot focus while in video mode ...)
It has contrast AF.
Why be so surprised? Panasonic G1 has it...
Olympuas has contrast AF too.
04-29-2009, 06:21 AM   #1402
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QuoteOriginally posted by dopeytree Quote
15 MP NEW APS-C CMOS SENSOR
Not entirely new, tweaked version of the existing 14.6Mp with less noise.

QuoteQuote:
ISO 50-6400
Done in software, Pentax has experimented with this before (K10D prototype).

QuoteQuote:
77 AF points in LV
Yes.

QuoteQuote:
11-point TTL double-cross sensor
SAFOX-system being updated, but I don't know the number of AF sensors.

|quote]
77 zones light metering
[/quote]

Yes.

QuoteQuote:
1/8000 shutter with 1/250 sync
Most likely yes.
04-29-2009, 06:21 AM   #1403
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QuoteOriginally posted by RMabo Quote
5 fps is real, but not with highest resolution, still more resolution than the limited 20 fps burst mode in the K20D.
Come on, the A700 and E-3 did it in 2007, even the middle-class D90 does 4.5fps. OK the 5D mk II does only 3.9fps but it's 21MP.

04-29-2009, 06:28 AM   #1404
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QuoteOriginally posted by RMabo Quote
but 20% asks the question - "where is the button for the ASA setting?"
I'm sure you mean the DIN setting?
04-29-2009, 06:35 AM   #1405
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I took this file from a dpreview sample of the K20D: http://72.32.185.217/~estone/extra/imgp9698.jpg.jpeg

rotated (it was portrait not landscape) and resized to 1920x12** I then opened a 1920x1080 file in photoshop and placed the photo in it, this cropped part of it. I then saved it as a jpg at 12 quality: http://72.32.185.217/~estone/extra/K-7%20video%20frame%20simulation.jpg

and opened in quicktime I then exported the file as a h.264 .mov file with quality at 3080 Kbit/sec
giving this file:
http://72.32.185.217/~estone/extra/K-7%20video%20frame%20simulation.mov

and here's a 100% crop from the above: http://72.32.185.217/~estone/extra/K-7%20video%20frame%20simulation%20100%.jpg

Not quite sure why there's a bit of colour change though.. but compare the quality of later .jpeg to the .mov file and you should have a rough idea of the quality to expect from full HD video

but this gives no indication of rolling shutter etc as it's just a simulated still.

Last edited by dopeytree; 04-29-2009 at 07:03 AM.
04-29-2009, 06:52 AM   #1406
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QuoteOriginally posted by dopeytree Quote
and opened in quicktime I then exported the file as a h.264 .mov file with quality at 3080 Kbit/sec
giving this file:
My consideration 10 posts ago may be more accurate.

The entire thing about H.264 is the time compression (compression along the time axis, not just along the spacial axes). Compressing a single frame tells you NOTHING!

E.g., a scene from tripod with a few moving cars only will yield much better quality than a handheld or a turn with varying perpective.

Which is why camcorder demo movie on vendor websites tend to show flowers smoothly bending in the wind
04-29-2009, 06:57 AM   #1407
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QuoteOriginally posted by Edvinas Quote
I have suspicion that many forum members already have K-7 photos Interesting, who is going to post them first?
Rice of course. Including another mind-blowing set of exclusive specs.


04-29-2009, 06:57 AM   #1408
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QuoteOriginally posted by RMabo Quote
Will not happen, the seals takes up too much space. Limiteds are meant to be the smallest lenses on the market. They would be too big with all the rubber seals inside and outside.
Hardly a valid point, wristwatches are made watertight with rubber seals.
04-29-2009, 07:04 AM   #1409
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QuoteOriginally posted by Gimbal Quote
Hardly a valid point, wristwatches are made watertight with rubber seals.
Well I don't quite agree w/ Roland but this analogy is no good. Watch has few moving parts external. I was just thinking about the seals in aperture rings and focus rings alone... I'm sure it's just a cost factor or lack of wanting to re-design... I'd wait and see what the supposed "new line" does/is.....
04-29-2009, 07:09 AM   #1410
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QuoteOriginally posted by RMabo Quote
Will not happen, the seals takes up too much space. Limiteds are meant to be the smallest lenses on the market. They would be too big with all the rubber seals inside and outside.

You said exactly the same thing about Pentax being unable to make a more advanced camera than the K20D smaller due to weather sealing and SR. It is not true. The seals hardly take any space and electronics can be made very small indeed; particularly now when theres no restrictions from the film spool and path....
Wheather sealing is no problem for the Limited lenses and I'll expect the next generation of these lenses to have that feature.....
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