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03-17-2010, 01:22 AM   #16
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QuoteOriginally posted by smc Quote
Pacific Canada....??
For some reason, I imagined the 645D spreading westward like a flu pandemic when you said that.

And yes, Pentax have found a niche, and tapped it. As long as they don't dawdle on the global rollout, they're gonna do nicely. The waves this thing is making are pretty big, especially from a company that had previously been chalked up as an also-ran.

03-17-2010, 03:17 AM   #17
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QuoteQuote:
Besides, we see the 645D as just a first step. We firmly intend to follow up with more MF bodies in the coming years to stay close to the forefront of image quality.
[wild speculations/]

There are 2 ways of seeing 35 sensors.
- First the native size for K-mount
- Second, crop size for 645-mount

The second perspective would not be stupid IMO, as the FF/35mm Body would be much more compact that already "compact" 645D, and 35mm would be the start of an upgrade path for user, not the end. In addition, if Pentax release a 35mm body at, let say 3000/$ it would be considered as cheap backup body for the more serious 645D/40Mpx.

The sensor is already available, it's the 18Mpx from Kodack that you find on the M9.

Downside would be that the wide end would be a pain to provide decent lenses.

But at the end, such a strategic move would be so much like Pentax

[/Wild speculations]

Guillaume
03-17-2010, 04:01 AM   #18
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QuoteOriginally posted by lithos Quote
If Pentax can pull off a rectilinear ~24mm, boy, will this thing sell.
Registration distances are
Pentax KAF: 45.46mm
Pentax 645: 70.87mm

So, registration/diagonal are:

APS-C (1.53x crop, 0.65x conversion): 162%
FF (1x crop, 1x conversion): 105%
33x44mm (1.27x crop, 1.27x conversion): 129%
MF (1x crop, 1.62x conversion): 102%

Therefore, existing APS-C lens designs could be enlarged(*) 95% and a 12-24mm design would become a 23-47mm lens. I hear that Sigma announced a 10-16mm rectilinear lens for APS-C. So, a 20mm MF crop lens is certainly feasible.

Even more so as the 33x44mm crop factor is smaller than for APS-C.

___
(*) A simple enlargement is not enough as the resolution would suffer (e.g., MTF 50% would drop to 20%). But a relatively more precise lens calibration and polishing, relatively smaller aperture and relatively smaller registration distance can compensate for this. E.g., rather than a 27/2.8 (a copied 14/2.8 design), one may build a 27/4.0 instead.

Last edited by falconeye; 03-17-2010 at 04:10 AM.
03-17-2010, 04:27 AM   #19
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QuoteOriginally posted by ghelary Quote
The sensor is already available, it's the 18Mpx from Kodack that you find on the M9.
Just a side note ...
The M9 sensor is a 6.8m Kodak sensor, half a generation behind the new 6m TrueSense sensors you'll find on Leica S2 or Pentax 645D. It's not that an issue on the M9 because Leica developed their own M-mount specific micro lens array.

I think, for full frame, 6 m CMOS FF sensors would be a better choice.

03-17-2010, 06:05 AM   #20
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QuoteOriginally posted by falconeye Quote
Just a side note ...
The M9 sensor is a 6.8m Kodak sensor, half a generation behind the new 6m TrueSense sensors you'll find on Leica S2 or Pentax 645D. It's not that an issue on the M9 because Leica developed their own M-mount specific micro lens array.

I think, for full frame, 6 m CMOS FF sensors would be a better choice.
The issue with CMOS sensors seems to be availibility either for APSC or FF. The only FF sensor that seems to be available at the moment is the Nikon/Sony 24Mpx sensor. I'm not sure that Sony would be willing to open up the only real selling point of their system (I mean Alpha 850/900)

Anyway, that was day dreaming, Pentax has certainly advanced discussion with Kodack and a clear view of future sensor lineup if they are speaking of future 645D cameras.

But still, basing 35mm sensor camera on 645 mount would make a lot of sense. In my mind
03-17-2010, 06:51 AM   #21
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QuoteOriginally posted by ghelary Quote
But still, basing 35mm sensor camera on 645 mount would make a lot of sense. In my mind
But why not keep it a little larger than 36x24 then? E.g. 44x33

The cut-through pictures show that there's literally a lot of room for miniaturizing 645-mount cameras. So you can make a camera that looks less "alien" and chunky than the 645D. Also worth mentioning is that a cropped 645-mount sensor would have room for SR movement (which I think may be a problem with K-mount?).
03-17-2010, 06:57 AM   #22
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QuoteOriginally posted by ghelary Quote
[wild speculations/]

There are 2 ways of seeing 35 sensors.
- First the native size for K-mount
- Second, crop size for 645-mount


[/Wild speculations]

Guillaume
I think 645D will never have 35 mm sensor. I think if Pentax could make FF camera, it will be camera with 24-28 MP sensor. My forecast - new Samsung FF sensor or old SONY 24.5 MP sensor.

Wild speculation - M9's sensor version with 3 fps.
03-17-2010, 07:11 AM   #23
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QuoteOriginally posted by er1kksen Quote
I think we've all seen the mock-up wideangle plenty of times by now...
Anyone who has gotten a look at this know if you can use a UV filter with it?

03-17-2010, 07:20 AM   #24
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QuoteOriginally posted by ogl Quote
I think 645D will never have 35 mm sensor. I think if Pentax could make FF camera, it will be camera with 24-28 MP sensor. My forecast - new Samsung FF sensor or old SONY 24.5 MP sensor.

Wild speculation - M9's sensor version with 3 fps.
Who care about FPS ? Apart from action shooters ie : photojournalist, sport reporters, 3 fps is plenty enough, lack of video/live view may be more difficult to sell to users.

The strong point in Pentax selling a cheaper 645 cropped body would be that they wouldn't have to develop a 3rd lens lineup.
03-17-2010, 07:22 AM   #25
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QuoteOriginally posted by kenyee Quote
Anyone who has gotten a look at this know if you can use a UV filter with it?
Digital sensor are very sensitive to IR not UV, on contrary of film, but apart from the orignal Leica M8, all cameras have a build in IR filter.

There's not point in UV filters in digital photography.
03-17-2010, 01:26 PM   #26
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QuoteOriginally posted by ghelary Quote
There's not point in UV filters in digital photography.
Photographed on a beach on a windy day or near a waterfall?
I'd much rather clean off a filter than the front bulbous element of something like Nikon's 14-24 lens that won't accept filters
03-17-2010, 02:32 PM   #27
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QuoteOriginally posted by kenyee Quote
Anyone who has gotten a look at this know if you can use a UV filter with it?
From the pictures it looks you can use any rounded filter in the filter drawer inside the lens. And that probably means that you can't put filters on front of the lens.
03-17-2010, 03:46 PM   #28
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I'm with Falk on the CCD *if* they could somehow correct for the purple fringing that seems to come with the CCD sensors. My K20D CMOS is seemingly immune to PF compared to my old K10D. Whereas, the CMOS is a cooler sensor more suited to longer exposures such as found in astrophotography. I suppose the usefulness of MF in astro has yet to be shown, though.
03-18-2010, 06:43 AM   #29
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Pentax 645D in Romania

The local Pentax distributor will bring the 645D body at approximately 9000 EUR in the coming 1-2 months.

Romania is in the EU so this may be valid for the rest of the countries.
03-18-2010, 07:04 AM   #30
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QuoteOriginally posted by jbinpg Quote
My K20D CMOS is seemingly immune to PF compared to my old K10D. Whereas, the CMOS is a cooler sensor more suited to longer exposures such as found in astrophotography.
I thought the K20D had less PF because of the AA filter? I noticed the drop in PF in my Tamron 70-300 when I switched from the K10D too.
I think the CMOS sensors are worse for astrophotography because you can't turn off the dark frame subtraction...at least not w/ Samsung's sensor...
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