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Forum: Pentax News and Rumors 04-26-2017, 03:01 PM  
Theta 4K developed
Posted By falconeye
Replies: 67
Views: 6,672
The YI 360 VR camera is an important product.

YI is known to bypass non-Chinese companies with less traditional products than a DSLR. GoPro now is in deep trouble because it can't compete with YI anymore. Even Google choose to partner with YI for its VR Jump project. Not GoPro. Not Ricoh Theta. Known as the YI Halo (17,000 USD).

YI has a very transparent spec sheet. They use two 4k camera and two 220 degree lenses. If distortion free, it would yield 6.3k. In practice, they obtain 5.7k which sounds about right.

5.7k VR is 1580 per 100 degree eye lens. Within a typical 50 degree FV, you are left with 790 pixels width. That about PAL quality TV, about the minimum one may actually accept. 4k VR (or even HD VR) are below the minimum quality threshold.

So yes, this YI 360 VR culd be the first affordable VR camera which isn't a toy actually. Which unfortunately includes the 4k Theta.
Forum: Pentax News and Rumors 12-09-2016, 03:42 AM  
rumored Pentax mirrorless camera - something between K1000 and K-01
Posted By falconeye
Replies: 480
Views: 40,171
Ok, fair enough.
But in order to compare export rates in a meaningful way, one first has to define economic regions of comparable size. Otherwise, one is ONLY seeing a size effect. In order to compare with the US, it is best to compare core Europe (F, UK, NL, B, L, D, A, CH [aka DACH]) with it. I assume core Europe does still export more than the US because it is embedded in the rest of the EU.
Or speaking otherwise, it would be interesting to see the export rate of California, a state half the population of Germany.
Forum: Pentax News and Rumors 12-08-2016, 05:17 PM  
rumored Pentax mirrorless camera - something between K1000 and K-01
Posted By falconeye
Replies: 480
Views: 40,171
I wonder if this is accurate information?
At least in Germany, consumer economy is very strong NOW and US economy is considered "indeterminate" in a Trump era. I don't see how 2018 predictions can be possible today.

At least my photo friends have their pockets full of cash but don't buy cameras like they used to. Cameras today are good enough and we simply return to the pre digital hype era of a solid but small photo market.
Forum: Photographic Technique 11-05-2016, 05:20 AM  
Lighting a tanning bed + model
Posted By falconeye
Replies: 8
Views: 966
Do a Google image search on "tanning studio". My hit #18 shows a pretty good sample of what to achieve.

E.g., make sure you have a good balance of bench and ambient light, such that the bench gives nice reflections on the model's skin.
Forum: Pentax News and Rumors 07-27-2016, 02:42 AM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
I believe Nicolas already mentioned it:
There is a so-called "Linear DNG" subformat which is supposed to be demosaiced data.
E.g., it is output by the DNG converter if selecting to output downscaled DNGs.

The problem with linear DNG is that it is 3x the size of uncompressed RAW, i.e., about the size of pixel-shift RAWs. Moreover, I am not sure about available bit-depths for linear DNG. Eventually, the ability to detect motion will improve over time and a true RAW format with all four sub frames would most probably still remain the best option for archiving.
Forum: Pentax News and Rumors 07-25-2016, 11:26 AM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
:lol:
Actually, I am always in favour of "the best possible".

I only answered to a post which introduced "workflow" into the discussion. And information theory tells us that workflow (data efficiency) is the biggest argument in favor of Bayer, not against it. I only wanted to explain that simple fact.

Of course, I would prefer full color information at every pixel. Unfortunately, such technology does not exist yet. Foveon has noise, pixel shift has temporal blur.

And between 4x resolution and full color information, I choose 4x resolution.
Forum: Pentax News and Rumors 07-20-2016, 02:51 AM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
That's true in theory, false in practice.

That's because the "workflow" has to deal with 4x the data and has to guess which pixels did change.

The immense success of the Bayer pattern has to do with its efficient "workflow", needing much less original data for the same perceived image quality.

The real merit of pixel-shift is an absolute better image quality at the pixel-level than a single capture with a Bayer filter could provide. For me, it may mean more fun at post-processing at 100% view.
Forum: Pentax Lens Articles 07-17-2016, 03:42 PM  
DA lenses on Full Frame: Test Shots thread
Posted By falconeye
Replies: 499
Views: 335,869
I just wanted to pin here this thread:
-> https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/304092-da-60-250-mod-ff.html
It reenforces the ++ rating the lens got in the thread OP.
Forum: Pentax News and Rumors 07-17-2016, 03:22 AM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
For my taste, this is a too pixel-centric view.

One should not forget that our own eyes don't capture color information at full resolution or anything close. Therefore, for an optimal viewing experience of the final art, there is no point in capturing full colour information at every pixel.
Forum: Pentax K-1 07-08-2016, 03:51 PM  
Been banned from DPReview
Posted By falconeye
Replies: 133
Views: 10,718
To Rishi's defense.

He has been contacting me on several occasions, including questions about standardized AF testing.

I consider him to be one of the most open minded and competent people over there at DPR. Of course, he is able to fail just like everybody else.

But I wouldn't accuse him of incompetence or tentative testing. I think in the end, this thing all comes to tone and language. The probable cause if people got banned, I guess.

About the test itself ...
In the tracking (riding in curves) test, the K-1 lost focus because the target left the focus area. That may be considered unfair and I agree. OTOH, some other cameras have their AF area spread a wider area, so the comparison is still valid. And in BIF, it is indeed difficult to keep a subject centered. Moreover, the target corossed the center area several times and K-1 did not re-aquire focus then. Unlike some other cameras which do.

Overall, the test is valid. It is not drawing an image representative of the K-1 AF capabilities if above behaviour is worked around. But valid it is.

One last word ...

Some well known bloggers started to make fun of over-loyal Pentaxians defending the brand on every occasion. Pentaxians have to tone down their voice quite a bit on other fora if they want to be perceived as serious photographers. I say this as a Pentaxian myself, although shooting another brand as well.
Forum: Pentax Lens Articles 07-08-2016, 03:31 PM  
DA lenses on Full Frame: Test Shots thread
Posted By falconeye
Replies: 499
Views: 335,869
I think that GeneV's test is a nice reminder that many genuine full frame lenses do vignette quite a bit as well.

I appreiate the recent entries shot with a K-1. Thank's a lot.

Nevertheless, may I suggest to provide a few corner crops as well, so everybody can assess sharpness on full frame, besides vignetting?
Forum: Pentax News and Rumors 07-07-2016, 02:09 AM  
2016 Pentax Forums T-shirt Design Contest
Posted By falconeye
Replies: 180
Views: 17,288
I propose to consider this entry as a good starting point for a re-designed pentaxforums logo. The current one is ... not pretty IMHO. At least not for a photographer used to some artistic level.
Forum: Pentax Lens Articles 06-15-2016, 05:18 AM  
DA lenses on Full Frame: Test Shots thread
Posted By falconeye
Replies: 499
Views: 335,869
Thanks for the test. How about corner sharpness?

I find it interesting that LR applies their profiles despite the fact that the image circle is different. Obviously, Adobe does not keep track of image circles in the profile and the body.

Which is kind of sad as it renders DA profiles useless on full frame bodies and makes full frame profiles for DA lenses impossible. However, hand-made profiles and their manual selection could help here.
Forum: Pentax K-1 05-30-2016, 08:02 AM  
No "ricoh"
Posted By falconeye
Replies: 40
Views: 3,452
+1

Asahi was the original name of Pentax, Pentax just being a brand name. Very similiar to Daimler-Benz and Mercedes.

However, Asahi licensing the name from Zeiss is a bit misleading. At the time, the company in question was Pentacon in communist Germany (now belonging to Schneider Kreuznach). Pentacon was formed from parts of VEB Zeiss Ikon which is the Eastern part of Zeiss after WWII. However, the company now known as Zeiss is its Western part. Pentacon did indeed invent the Pentaprism (in the Contax S camera, picking up on wartime plans) which is why Pentax very likely had a reason to license the name from them. OTOH, I really doubt any capitalist company ever cared about licenses hold by any communist company, or vice versa ...
Forum: Pentax News and Rumors 05-18-2016, 05:37 AM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
I only used a K-1 at an event. It certainly felt well and I personally love the Pentax build quality and user experience. I'd say it outperforms an A7rII in terms of responsiveness, so IMHO, it is a more professional tool overall. But having said this, it is no speed monster too.

---------- Post added 18th May 2016 at 13:42 ----------


Ok, getting rid of color filtration is the one last big step remaining. I agree.

I've just no idea which timeframe to expect when it would happen.
Forum: Pentax News and Rumors 05-17-2016, 10:05 AM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
This is an interesting question.

Looking at the current D500 buzz, just pushing the state of the art a little bit still seems to do the trick. Just stay ahead of the pack.

What separates pro-level cameras from more enthusiast-level cameras IMHO is responsiveness. Compared to the top of the line cameras, cameras like a A7rII etc. feel like toys, sooo slow in everything. A pro-level camera must be able to catch the image in less than the blink of an eye, including the time required to grab the camera. And contrary to popular belief, no current camera is without its limitations. So, that's an area to improve.

Another future area probably is 4k and 8k video capture with in-body frame selection apps.

OTOH, I think in-camera post-processing is useless. Images will simply be shared to a tablet and processed there. All pro photographers carry tablets these days. But ease, speed and reliability to offload images to tablets in an area for huge improvements. IMHO, this should be a fully automated process and Nikon's snapbridge is a step in the right direction here (permanent pairing).

Eventually, I think image quality (low light noise etc.) can't be improved much anymore beyond what a full frame camera delivers today. So, a pro-level camera has to differentiate elsewhere. And this does include medium format, because fast MF lenses either don't exist or would have too shallow DoF.
Forum: Pentax News and Rumors 05-02-2016, 03:50 PM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
Correct.

0.5EV was a ballpark figure which seems to be rather accurate today (wrt 18% gray noise). It used to be larger in the past and will aproach 0EV in the future, as we approach the limits of physical feasibility.

And as I explained some time ago, please forget that "substrate" nonsense.
Forum: Pentax News and Rumors 05-02-2016, 09:53 AM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
The difference is 1.22EV 0.5EV and that's a constant.

As much as people now rave about the K-1 and full frame image quality, as much they rave about D500 and how APSC "now" almost matches full frame.

It is more about wishful thinking than anything else. And the newest firmware for JPG processing.

Wrt raw quality, the best DxO low light score (ISO) for APSC currently is 1438 (D5500, 1235 for Pentax K-5II). According to Photographic Dynamic Range versus ISO Setting , the D500 scores 30% better which would be closer to 1900 (personally, I expect it to score around 1600) and in line with the best full frame scores, scaled to APSC.
Forum: Pentax News and Rumors 05-02-2016, 04:39 AM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
No reliable source.
They compare JPG, accept different exposure times for the same ISO level, and state that D810 and D800 share the same image sensor which they do not. Having said this, it may well be the K-1 beats D810. The D800E does too in terms of noise (by a tiny margin).
Forum: Pentax K-1 05-02-2016, 03:40 AM  
Can anyone with a K-1 give me a review of the AF?
Posted By falconeye
Replies: 71
Views: 13,965
I am sure the K-1 AF is good enough for 99% of use cases.

However, being curious myself, I did a quick and dirty side by side test. AF-S from out of focus into focus in normal store light:
1. K-1 + Pentax 70-200/2.8 at 200mm
2. D500 + Nikkor 70-200/2.8 at 200mm

Where, of course the D500 AF is that of the $7000 D5. I.e., this is an apples to oranges test. OTOH, I did not test AF-C where the D500 should excel.

Both combinations focussed with a noticeable lag, with the lag being 2 or 3 times larger for the K-1. I cannot say if this is from the AF or the lens focus motor. Don't get me wrong: the lag for the K-1 was still ok for most shooting situations. But it is not in the same class as D5/D500.

BTW, in live view, the D500 AF was ridiculously slow ;)
Forum: Pentax News and Rumors 04-29-2016, 05:56 AM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
No surprise here.
It seems Pentax isn't a reliable partner to associated pros.

kenspo, you may not have followed it, but before you, the forum has seen another brand ambassador. It was benjikan (Benjamin Kanarek, a well know fashion photographer from Paris and North America) and I do still remember that the divorce with Pentax wasn't nice.

I would have hoped that under Ricoh, the relationship to associated pro photographers would be handled a bit more like a partnership rather than hire and fire. Obviously not.
Forum: Pentax News and Rumors 04-27-2016, 04:52 AM  
Pentax K-1 Officially Announced
Posted By falconeye
Replies: 1,591
Views: 171,920
I am sorry to say that WR in French is VR and unfortunately, only Nikon lenses got this designation so far :p
Forum: Pentax Lens Articles 04-26-2016, 08:34 AM  
DA lenses on Full Frame: Test Shots thread
Posted By falconeye
Replies: 499
Views: 335,869
Barry, thank you so much for your compilation.


Yes, I agree.

I propose someone creates and maintains a moderated thread which collects results for DA lens image quality with the K-1.
Forum: Pentax News and Rumors 04-25-2016, 03:31 PM  
New article on the K-1 Special Site
Posted By falconeye
Replies: 43
Views: 6,939
:)
Nevertheless, I guess intuition can be fooled.

The Bulbous Bow of tankers comes to my mind ...
Forum: Pentax News and Rumors 04-24-2016, 04:35 PM  
New article on the K-1 Special Site
Posted By falconeye
Replies: 43
Views: 6,939
Interesting read. Esp.

triggered my attention. Is this the explaination why the 70-200/2.8 was delayed?

Anyway, it is interesting. It highlights how computer-aided lens design cannot automate the design process as much as we (in the forums) tend to believe. One naively would have thought that error propagation analysis in the design software with the quality-inspection tolerance parameters as input values would have predicted the problem. It obviously didn't and experience of lens designers remains key to the success of optical companies.
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