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02-13-2014, 04:23 PM   #301
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QuoteOriginally posted by bossa Quote
A mirrorless MF camera with the right flange distance could allow FF lenses to be used in Crop Mode for a FF experience and this would allow a transition to MF, over time, for people with legacy glass. If it's good enough for Sony and Leica to develop adapters then I don't see why Pentax should limit themselves.
Yawn. SSDC.

It isn't the mount or the camera that matters. It is the lenses. Adapting FF lenses misses the point. You have to mount 645 lenses. So how is the MIL 645D Camera any smaller once the adapter is mounted?

02-13-2014, 04:24 PM   #302
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I'm not at all an optics specialist, but wouldn't a short flange difference on an MF system require quite specialized lenses to cover the sensor area? The image circle has to widen after the last element, and the longer the distance the more dramatic the angles would need to be.

Does this show up at all on native A7 lenses from Sony?
02-13-2014, 04:37 PM   #303
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QuoteOriginally posted by interested_observer Quote
As, I understand - there is a basic architectural difference between Canon, Nikon and Pentax in terms of the image processing hardware. Canon's image processing chip allows for multiple parallel processing paths, while Nikon/Pentax's do not. Both Canon and Pentax use variations of the Fujitsu Milbeaut, while Canon uses a version of Texas Instruments OMAP. Unlike Fujitsu Milbeaut, Digic (Texas Instruments OMAP.) supports multi-processor configurations and can also execute external programs. The ability to support and execute external programs enables the Canon's ability to have third party capabilities like CHDK.

Thanks for the information, Ricoh/Pentax might have to to alter the architecture to allow for a degree of SIMD parallelism or even task sharing across two cores on the same die.The storage and computational requirements for 4K video are substantial. It would be very interesting, (however unlikely) if Ricoh could get someone like NVIDIA or AMD to produce a processing chip with sufficient capabilities to handle 4K video and data storage in a single platform.
02-13-2014, 04:51 PM   #304
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QuoteOriginally posted by derekkite Quote
I'm not at all an optics specialist, but wouldn't a short flange difference on an MF system require quite specialized lenses to cover the sensor area? The image circle has to widen after the last element, and the longer the distance the more dramatic the angles would need to be.

Does this show up at all on native A7 lenses from Sony?

If that is the limiting factor then the lens designers can add a 'hollow tube' to the end of the lenses in order to maintain focal length. Long focal length lenses are already designed this way.

A short registration distance allows easier design of wide angle lenses.

In the extreme case the image circle doesn't widen after the last element - this is the definition of telecentricity. In theory this is required by the M4/3rds standard (which requires telecentric lenses).

02-13-2014, 04:56 PM   #305
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Do we know

Do we know when there will be some official information?
02-13-2014, 04:59 PM   #306
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Thanks
02-13-2014, 07:05 PM   #307
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QuoteOriginally posted by Digitalis Quote
Recent images have revealed that the 645D might have video/ live view - if this is the case than be prepared for a frenzy of cinematographers. Especially when one takes into account that there is no similarly priced alternative for MF video from either RED or black magic.
Hey, what's that red button for? "Record" ?
02-13-2014, 07:47 PM   #308
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Hmmmmm, noser is right. The photo from CP+ clearly shows a red button. Funny, all of the press release shots I have seen have had the tilt-screen strategically obscuring it.

Whatever it does, it also appears to be a delete button with the trash can icon next to it.

edit: ah, just noticed that Digitalis posted a similar image upthread



QuoteOriginally posted by noser Quote
Hey, what's that red button for? "Record" ?


02-13-2014, 08:00 PM   #309
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Red on the K3 is live view.
02-13-2014, 09:12 PM   #310
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QuoteOriginally posted by Roberts Quote
No, there is not so much empty space in 645D behind the sensor. I don`t know about 645d II, but taking into account that 645DII has articulated screen, there is less space behind the sensor than in 645D.
Guess we're seeing the same thing and interpreting it differently. Most DSLRs have their rear LCDs crammed up against the back of the sensor.
02-13-2014, 09:23 PM   #311
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QuoteOriginally posted by derekkite Quote
Red on the K3 is live view.
Thx... I don't have a K3 so I wasn't sure how the modes work. I think I had in mind the red button from the K-01, which I heard was one-touch record or something.

It could very well be the 645D-ii would only be LV, if they recycle the K3 firmware (like the K7 > 645D).

It would still be nice for display on a large monitor in a studio situation though.
02-13-2014, 09:25 PM   #312
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QuoteOriginally posted by tuco Quote
Engineers over in metric countries must deal with the ambiguity all the time of what is mass for calculations vs weight/force when everything is called kilograms for both.
Only if the planet on which the object resides is unclear.

Otherwise, it is clear because kilograms are always mass. There's no ambiguity when you CALL kilograms "weight" because all the objects are assumed to reside on Earth, where the two quanities are simply related by a factor of 9.8. Every engineer who made it through his program would know kilograms are actually a unit of mass--they'd never pass a few core courses without knowing the difference between weight and mass!

I'd say the ambiguity is in the old USA. Most people don't even know the unit of mass (it's slugs, btw), since it is never used. When given some block on a spring problems (which need mass, not weight), many of my DE students--all future engineers--didn't realize they needed to divide pounds by 32 to get mass to make the problem work. They always equated pounds and kilograms as the same. If all they knew were kg, this wouldn't happen.
02-13-2014, 09:47 PM   #313
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QuoteOriginally posted by MadMathMind Quote
kilograms are always mass.
...except when they aren't.
02-13-2014, 10:05 PM   #314
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There is no video switch button!
02-13-2014, 10:48 PM   #315
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After sitting here and comparing that image to my own 645D I noticed another thing: the AF point selector dial has been blanked as well. It is likely we will see a K3 style AF system used in the 645D as well, which will give the 645D MK II a boost in low light capability.
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