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Forum: Pentax K-1 5 Hours Ago  
Mark II image processor impressions
Posted By biz-engineer
Replies: 7
Views: 470
From analyzing images, K1 colors balance is slightly shifted at high ISO compared to low ISO settings.The K1 II corrects that. High ISO images don't contain much detail anyway, so it doesn't make sense to keep high frequency noise anyway, noise reduction is adapted to ISO setting, which is not a bad thing. However, using low ISO is the best for getting high image quality and the original K1 works well at low ISO, and is now relatively cheap for a 36Mp full frame camera.
Forum: Pentax K-1 1 Day Ago  
On location with Matt Emmett, Heritage Photographer & Pentax Brand Ambassador
Posted By biz-engineer
Replies: 6
Views: 370
Nice video. Thanks for sharing. The K-1 is a good tool, across enthusiast and professional use.
Forum: Pentax DSLR Discussion 2 Days Ago  
The Good - The Bad and The Ugly about Pentax
Posted By biz-engineer
Replies: 39
Views: 1,492
Agree on that. For lenses, lack of third party support is a limitation but not blocking if there is a Pentax product available, usually, OEM lenses are still generally a tad better than third party lenses, depending on cases.
Major issue for flash systems. Lighting is very important for getting top image quality, but getting is work fully with Pentax is a hit or miss. Ricoh should actively work on that, I mean, there should be a person at Ricoh Imaging responsible for taking with main flash and strobe makers to make sure P-TTL works with Pentax cameras, especially high-end model. Currently, flash interoperability is better with older Pentax models than it is for the K1 flagship that is supposed to be used professionally, that's not good at all.
Forum: Pentax DSLR Discussion 2 Days Ago  
A Pentax Hidden Feature Perhaps?
Posted By biz-engineer
Replies: 24
Views: 1,292
Yes, that works pretty well, no one is using it, but everyone complains about Pentax not having eye AF. In order to check if face detect could be used reliably, I took a hundred of test shots of faces with face detection AF, and I used focus peaking in my post processing software to check focus, and the result was that > 90% of the shots are indeed focused on the eye! It happens that the eye is naturally a part of the face that has sharpest contrast between the white and the iris... just think about it for a minute... and then think about all the folks saying that Pentax does not do eye AF... And in fact, if you try the face detect of Pentax with subject wearing sunglasses or face profile, AF won't lock on the face... simply because Pentax AF face detect algorithm is trying to locate a pattern of two round balls in order to conclude that a face is there... So, the Pentax face detect is actually an eye detect AF but Ricoh never stated it.

With regards to adjusting the focus manually with quick-shift... I've found that I can refine focus better than the camera but I am very slow to do that.

And with regards to the "hidden feature", I agree, looks like the guys writing Pentax camera manuals are talking to the guys who designed the camera. To me it looks like the Pentax camera designers are living on an island at Pentax, deep hidden from marketing and customers.
Forum: Pentax DSLR Discussion 2 Days Ago  
The Good - The Bad and The Ugly about Pentax
Posted By biz-engineer
Replies: 39
Views: 1,492
Video? I don't know what is better: Full frame FHD at 60 i/s or 4K 30 i/s cropped in the middle portion of the sensor ...
Forum: Pentax K-1 3 Days Ago  
Dynamic Range to ISO comparisson K-1 Vs K-1 Mark II
Posted By biz-engineer
Replies: 6
Views: 490
I think it's way too over-complicated make up "theory" for what it is. In old day when I developed video drivers chips of flat panel displays, we used a criteria that 6 effective bits per channel were required for the human vision to perceive good tone gradation. To put it straight back into place, I say that all bclaff does is to postulate that 3 bits per channels are necessary to code tones in shadows. That's like considering dynamic range as the SNR at a level of luminance lower than 18% grey. Anyway, 6bits per channels are enough for good enough quality, all the rest of free headroom for image post-processing.
Forum: General Photography 10-14-2018, 06:00 PM  
What's the mirrorless winner - need your help please!
Posted By biz-engineer
Replies: 29
Views: 1,075
It's like to quit smoking, every smoker knows that smoking is not good for health and bank account, but how many succeed to quit the smoking addiction.
Forum: Pentax K-1 10-14-2018, 04:08 AM  
K-1ii white dot issue ?
Posted By biz-engineer
Replies: 18
Views: 879
Dark current noise is a fact of all sensors. It is more or less prominent depending on the sensor. Dark frame subtraction has been a regular technique since digital cameras are used, it's not a "problem" of Pentax K1 or Pentax K1 II, it's something we have to consider for the making of night sky photographs. White dots are on the K1 and K1II and all cameras using the same sensor (Nikon, Sony..), they do appear when pushing ISO and exposure time. Ten minutes exposure time is very long... I use 2 minutes exposures at ISO1600 at dark sites , f2.8, means your aperture was f5.6 in the example shot (why no aperture value in the exif?). If you need to expose for 10 minutes, means you have a slow lens for night sky photography, and so stacking multi-exposures is the cheap option at the expense of spending more time for the post processing.
Forum: Pentax K-1 10-14-2018, 01:43 AM  
K-1ii white dot issue ?
Posted By biz-engineer
Replies: 18
Views: 879
In order to get a nice clean gray frame, the 10 minutes exposure would consist of stacking 10 exposures of 1 minute each, with any camera of any brand, or get a lens with larger aperture so that to shorten the exposure time or reduce the ISO setting. That's how most people do for night sky photography.
Forum: Photographic Technique 10-13-2018, 06:19 AM  
Exposing for the highlights
Posted By biz-engineer
Replies: 23
Views: 1,019
There is only interest to expose for the high lights at ISO100 to avoid blown highlight. At ISO200, the sensor is underexposed by 1 ev (from sensor physical dynamic range), ISO400 underexpose by 2 ev. , ISO800 underexposes by 3 ev. etc.. (ISO200 , 1 ev of highlight can be recovered by underexposing 1 ev in post), etc. At ISO100, the best way to have no highlight blown out without having the camera reset to a different exposure is to set the camera to M mode, exposure compensation to +2ev, press the green button, and that's all: from that point , all shoots will be exposed without burned high lights unless the lighting changes, if the light source changes then same procedure again. There is no "free lunch", doesn't seem like camera have a mode that expose for the highlights, because sometime the highlight is out of interest for a photographs, and the rest of the image would suffer less quality just for protecting a tiny piece of highlight area that is not playing a role in the image. It's up to the photographer to decide what to do for getting the best possible images depending on what the photograph should emphasize in a scene.
Forum: Pentax News and Rumors 10-13-2018, 12:47 AM  
Your Best Photo+: RICOH IMAGING has renewed the condition of “Your best photo”.
Posted By biz-engineer
Replies: 55
Views: 2,578
Yes. They are usually downsized samples, not the full resolution files, and unless explicitly given one of the creative commons licenses, the published files aren't legally usable without prior authorization from the publisher, unless the site where the photographs are published explicitly defines if and how the photographs can be reused. If the photograph is of professional quality, it shouldn't be given away for not benefit (financial, brand promotion etc). Shall truth be told, there are not so many professional quality photographs in the portfolios of the fans of camera gear...
Forum: Flashes, Lighting, and Studio 10-12-2018, 04:00 AM  
High Speed Sync for GODOX Bulb Flashes and Pentax
Posted By biz-engineer
Replies: 14
Views: 385
Thanks. The seller is in China, that's import tax added here. Last time I purchased something shipped from China on amazon, I had to pay 150 Euros of tax (costed me 30% more than if I had purchased the same thing at the local shop).
Forum: Pentax News and Rumors 10-10-2018, 11:23 PM  
Visiting Photokina what I learned.
Posted By biz-engineer
Replies: 75
Views: 5,595
What happened after photokina? The Nikon Z7 and Canon EOS R are now on the shelves next to Sony A7, and everything came down quiet again, shops waiting for the rare customer in town willing to drop 5 grands on a new camera for not having a mirror. OTOH, I've seen Canon 5DIII and 24-105 f4 kit used at 1500 Euros.. that's a third of the price of the Nikon Z7 24-70 f4 kit.
Forum: Flashes, Lighting, and Studio 10-10-2018, 10:52 PM  
High Speed Sync for GODOX Bulb Flashes and Pentax
Posted By biz-engineer
Replies: 14
Views: 385
Where can we buy that? Last search I did couldn't find the Pentax version on amazon. It's good the see online ads for Pentax compliant lighting devices but no info about where it's available for sale ?
Forum: Pentax Medium Format 10-09-2018, 01:22 PM  
645Z vs. Fuji MFD Mirrorless
Posted By biz-engineer
Replies: 29
Views: 1,253
For landscape on a tripod, the 100Mpixels can be had with a Pentax K1 on a L bracket with a $15 arca plate extender on a tripod (rotate around the nodal point), take 3 vertical shots (can even be 3 pixel shifted frames, 145Mbytes each) at ISO100 and you are done, gives plenty of resolution. The trouble is, bigger than 100Mp gives some stress to image processing tools.
Forum: Pentax Medium Format 10-07-2018, 11:39 AM  
645Z vs. Fuji MFD Mirrorless
Posted By biz-engineer
Replies: 29
Views: 1,253
Currently, it is not easy to select a good yet affordable MF system. Pentax 645 body is large, old set of lenses. Fuji GFX50S and GFX50R use contrast detect for focusing, it is rather slow, fine for stills, landscapes, but would be a challenge for weddings, catwalks , where the Pentax would nail focus faster. It is expected that the Fuji GFX 100Mp will use phase detect for focusing, but it won't be cheap. Usually, when going out with a MF system with a suitable tripod, is not something small anyway. I'd wait to see how the new Fuji 100Mp will be like.
Forum: Flashes, Lighting, and Studio 10-05-2018, 03:54 AM  
Help with first flash
Posted By biz-engineer
Replies: 9
Views: 393
For manual flash (you have to set the flash power setting yourself, manually, for every shot), all flash guns will do. For automated flash setting with the P-TTL, it's not sure that third party flash models stated as compatible for Pentax TTL will fully work. I would recommend to double verify flash model / camera model compatibility.
Forum: Pentax News and Rumors 10-04-2018, 08:46 AM  
Ricoh is working....with Zenit on a K-1 rebadge DSLR???
Posted By biz-engineer
Replies: 107
Views: 6,024
There is money to be made out of legacy. Some companies are supporting old products that OEM don't want to support when the type of product become out of their focus. The logic is that if Nikon, Canon, Leica etc.. develop their new product lines with new mount, there will be a legacy market left for who want to take it. Not sure about the Pentax thing.
Forum: Photographic Industry and Professionals 10-02-2018, 11:50 AM  
Camera industry 2018 - now doom is everywhere - shareholder tip: sell
Posted By biz-engineer
Replies: 47
Views: 1,887
The market for lens mount adapters is booming. You have to sell stocks of camera companies and buy stock of Metabone and Novoflex. Just do a search of lens mount adapters on amazon, I get 106 pages of adapters !!!
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 10-01-2018, 10:53 PM  
L Mount alliance, new Nikon, Canon mounts...future
Posted By biz-engineer
Replies: 31
Views: 800
Interesting opinion that let me thinking. Actually, the way I see it is each company see the market shrinking and having to pay their bills, their approach is to offer a broad range of product and be pragmatic with regard to what product they will discontinue or not. Sigma and Tamron continue to release lenses for DSLR mounts and they'll also make new lenses for MILC mounts. In fact there is a lot of reuse of parts and IP between DSLR and MILC, and so the goal is to grab money from every source. IMO we will not see an all MILC approach with abandon of DSLR, the proportion of investments and new products will depend on adoption. Businesses are very pragmatic, they don't drop products/technologies as long as there is money to be made out of it. Film to digital was very different in a way that the digital workflow was revolutionary making it very easy to take pictures to everyone, and there was a lot of growth. Currently there is no such revolution with mirrorless, as you say, it's basically a minor change in the user interface, it's not really pulling the masses, and MILC has been around for a very long time with small sensors, it just that EVF implementation moved up to apscu43 and then full frame and MF. MILC is a way to extend the market life cycle of the digital camera market by giving a reason to people to buy something new as opposed to keeping their DSLR until it breaks.
Forum: General Photography 10-01-2018, 01:41 PM  
Déjà vu Photokina 2016?
Posted By biz-engineer
Replies: 48
Views: 1,661
If I'm not mistaken , your K30 has 16Mp, as you were referring to yourself being limited by the equipment you know.
Forum: Pentax Medium Format 10-01-2018, 01:39 PM  
Pentax 645Z replacement?
Posted By biz-engineer
Replies: 94
Views: 6,083
That confirms what was written by photoptimist.
Forum: Pentax Medium Format 10-01-2018, 01:34 PM  
Pentax 645Z replacement?
Posted By biz-engineer
Replies: 94
Views: 6,083
No, because the shot noise is signal correlated and the quantization noise is about constant. Therefore, oversampling only improve the total S/N be a negligible amount. That's why the Sony 45Mpixel sensor produces about the same image S/N as the 12Mp sensor of the same size made by the same company. For full frame, the S/N max out at less than 8bits effective. Now, your assumption is based on having the possibility to increase the max voltage accross the PIN junction of CMOS sensors, unfortunately this is not possible due to semiconductor material physics, and this is even less possible when the pixels get smaller.
Forum: Pentax News and Rumors 10-01-2018, 08:54 AM  
Miscellaneous development at Ricoh Imaging
Posted By biz-engineer
Replies: 112
Views: 10,766
they can't even file patents without having some of the customers digging into it... info is being posted on the web at the speed of light. Wow. Any bit of info is going to be looked at with a magnifying glass. Scary. If I was working on engineering project for Ricoh Imaging I would hide completely from anyone having a forum account :confused:
Forum: Pentax K-1 10-01-2018, 06:39 AM  
Shutter shock blurring
Posted By biz-engineer
Replies: 13
Views: 760
You won't see it with a flash because the flash pulse is like bringing up equivalent shutter speed to 1/5000 at reduced power.
When shutter choc there is, also raise the question of camera motion effect at those shutter speeds. Using 1/40th to 1/80th with a 50mm lens isn't reducing motion blur to 0 even with SR enabled.
If sharpness is the only goal, its maximum is achieved either with a lot of light and high shutter speed and base ISO, or with a flash gun set at half power (or less than half power) and base ISO.

If the drop of sharpness happens in real shooting situation then it's worth considering, however it's less a concern if shutter blur happens in test conditions only.

Depends what we photograph:
- if that's portrait it'll be sharp enough even with shutter shock (some may smooth out skins in post, or use Skin type1/2 options in K1)
- if that's landscape macro or reproduction works tripod and ES or even pixel shift can be used
- if that's sport with long lens shutter speed is usually over 1/250th -> 1/2000th, SS is much less a problem in that range of shutter speed

---------- Post added 01-10-18 at 15:56 ----------


If you have a 4K monitor, chances are you cannot see the blur. I have an 27 inch HD monitor and I can barely see the shutter blur of the examples posted at 100%, there is a little bit of blur but not obvious to my eyes.
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