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03-23-2015, 04:18 PM   #361
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QuoteOriginally posted by clackers Quote
It's like a holy relic, isn't it, with lines of Pentaxians hoping a glimpse of it will cure their afflictions?
Lol, that was also what I thought. It's sad. Better to have put it away after CP+. I don't think Ricoh are doing themselves any favours with this new display, least of all with an APS-C lens mounted on it. That is a bit of a blooper.

03-23-2015, 04:28 PM   #362
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Why? There are 3 things they're telling us:
1. It's a FF K-mount DSLR
2. It will accept APS-C lenses via a crop function
3. It will be launched by the end of this year.
Putting an APS-C lens on the mock-up is in line with #2
03-23-2015, 04:36 PM   #363
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Actually, the discussion here was about no flash, the obvious (to me) articulated lcd. I don't see how this changes anything at all.
03-23-2015, 05:11 PM   #364
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It ain't the prettiest camera I've ever seen, but it looks as if you could break rocks with it! I like it.

03-23-2015, 08:01 PM   #365
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Perhaps the Birmingham photos aren't detailed enough, but the 'relic' looks like it's had a touch of sand-paper applied. Some of the 3D printing crinkles and ridges seem to be gone now, for example:

CP+:


Birmingham (PhotographyBlog.com image):
03-23-2015, 11:03 PM   #366
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The ridges are still there, the photo above just had a better lighting and a polarizer.

The viewfinder looks pretty juicy doesnt it? Does that give any indication of how good it could be?
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03-23-2015, 11:30 PM   #367
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QuoteOriginally posted by Class A Quote
... by a factor of 2.25..
...by a factor of ~2.4
QuoteOriginally posted by Class A Quote
... larger sensor...
A FF sensor size is ~2,4 times larger than APS-C one.Correct?

36x24 / 23.5x15.6* = 2.3567921400.......
*K-3 sensor size
03-24-2015, 12:07 AM   #368
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Did you guys hear about the new 3D printed sensors? They don't need Sony anymore.. they just print them.

03-24-2015, 01:05 AM   #369
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QuoteOriginally posted by Tesla Quote
They don't need Sony anymore.. they just print them.
Printing silicon, and even complete metal jet engines, I can understand. But can they print optical glass and lenses nowadays too? That would really change the industry.

---------- Post added 2015-03-24 at 07:14 PM ----------

QuoteOriginally posted by Deimos Quote
Does that give any indication of how good it could be?
It does look like there is going to be a huge pentaprism in the camera. Or something else fancy going on in the area around the pentaprism and viewfinder eye-piece, like a big metering sensor or some EVF features.
03-24-2015, 01:19 AM   #370
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QuoteOriginally posted by romeck Quote
...by a factor of ~2.4
A FF sensor size is ~2,4 times larger than APS-C one.Correct?

36x24 / 23.5x15.6* = 2.3567921400.......
*K-3 sensor size
wrong, of course.

2.25, not 2.4 we say not about area. but about pixel density.

Last edited by ogl; 03-24-2015 at 01:28 AM.
03-24-2015, 02:10 AM   #371
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QuoteOriginally posted by ogl Quote
wrong, of course.

2.25, not 2.4 we say not about area. but about pixel density.
Ok. "pixel density"
=
Thus, from where such and not another number: 2.25?
With diferrent sensor sizes and density we have lot of fraction...
K-5 and K-3 both are APS-C, but with different density of pixels. Which of them is compared to FF sensor and with at which the density of its own.

Where I am wrong?
03-24-2015, 05:49 AM   #372
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QuoteOriginally posted by romeck Quote
Ok. "pixel density"
=
Thus, from where such and not another number: 2.25?
With diferrent sensor sizes and density we have lot of fraction...
K-5 and K-3 both are APS-C, but with different density of pixels. Which of them is compared to FF sensor and with at which the density of its own.

Where I am wrong?
36 MP FF camera has the same pixel density as 16 MP APS-C. 36:16=2.25
03-24-2015, 06:04 AM   #373
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QuoteOriginally posted by rawr Quote
But can they print optical glass and lenses nowadays too? That would really change the industry.
you could print them but you would still have to buy lapidary supplies to polish and smooth out the "steps" in the finished product. Unless you like your bokeh to look like freshly cut onion, speaking if which: If I ever saw that I would probably cry. Also the lack of consumer friendly optical multi-coating technology means that the flare resistance of printed lenses will probably be absolutely abysmal. Without proper anti-reflective coatings there will be limits on the number of elements and complexity of lens designs with printed optics.
03-24-2015, 09:05 PM - 1 Like   #374
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QuoteOriginally posted by romeck Quote
A FF sensor size is ~2,4 times larger than APS-C one.Correct?
It depends.

Canon APS-C implies a conversion factor of ~2.56 and even when you take a single manufacturer like Pentax where the conversion factor is often close to ~2.25, the actual factor changes with each sensor. I'm not sure whether all of the 23.5x15.6 area quoted for the K-3 is optically active. Usually, there are at least a border of dark pixels to be subtracted, etc.

To simplify matters, the crop factor for Pentax, Nikon, etc (but not Canon) is typically assumed to be 1.5 even though it may be closer to 1.53 in reality. The square of the crop factor is the area conversion factor, hence 2.25 being commonly used.

@Ogl: Your pixel density example happens to yield the correct result, but only because the sensors have the same pixel density and their areas differ by the APS-C <-> FF area conversion factor. Normally, working out the area conversion factor using the number of MP would not work at all.
03-24-2015, 11:21 PM   #375
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Roughly, APS-C area is 42% of the full 135 format area.
Fractions of a mm do play some role, as they even out equation that roughly 36MP FF sensor may produce a roughly 16MP APS-C cropped image, if the sensor is using same pixel density and tech as the APS-C sensor. That is, basically, why everyone expects Pentax FF to come with a 36 MP FF sensor.
On the other hand, 24MP FF sensor would produce ~10 MP APS-C crop image. For many, not sufficient.
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