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Forum: Pentax News and Rumors 10-12-2021, 08:56 AM  
DFA21/2.4 Limited available in amazon jp
Posted By cfraz
Replies: 182
Views: 13,846
This can be true if and only if you care about aperture and filter size and totally disregard all other lens attributes.
Forum: Pentax K-1 & K-1 II 09-06-2021, 02:32 PM  
New K1 Mark II. I think I've gone too far.
Posted By cfraz
Replies: 90
Views: 4,211
Or one can invoke the often-promised answer:

Just. One. More.
Forum: Pentax K-3 III 08-21-2021, 04:50 PM  
K-3 III - what is "deep learning with learning promises" in AF-system?
Posted By cfraz
Replies: 39
Views: 2,506
Absolutely not.
Forum: Pentax News and Rumors 08-04-2021, 11:03 AM  
D FA 21 Limited is one of the three.
Posted By cfraz
Replies: 1,748
Views: 137,564
Interesting. Just curious how a lens correction profile can improve sharpness.
Forum: Pentax News and Rumors 07-31-2021, 04:29 PM  
D FA 21 Limited is one of the three.
Posted By cfraz
Replies: 1,748
Views: 137,564
The Rico Imaging U.S. website shows 2.4 times as many K-mount primes under $1000 as above. I suspect that's good indication that the next released prime will be an f2.4 lens.
Forum: Pentax K-3 III 06-13-2021, 02:35 PM  
FA43 Limited registers as 42mm?
Posted By cfraz
Replies: 4
Views: 430
It's an unfortunate side-effect of earth's increase in rotational speed. With earth spinning faster, something, somewhere had to give.
Forum: Pentax K-3 III 06-03-2021, 09:09 AM  
AF-C of K-3III is impressive
Posted By cfraz
Replies: 692
Views: 76,301
The AE RGB sensor cannot perform AF on it's own. It can, under the right conditions, identify where in the frame an eye is located. But it can't even say whether that eye is 2 meters or 2 kilometers away. It only knows the X-Y coordinate position of the eye within the frame. The PDAF system then uses the focus point* nearest the eye X-Y coordinate to determine distance and move the lens accordingly.

* I suppose it's possible for the PDAF module to find distance for multiple focus points near the eye, and then use some sort of average to set focus distance.
Forum: Pentax News and Rumors 05-12-2021, 08:04 PM  
The challenge of the new Pentaprism
Posted By cfraz
Replies: 168
Views: 12,750
According to Ricoh, the brighter viewfinder image is owing to, in part, a high refractive index glass with lower reflection losses than in conventional prism glass. See the link in post 1 of this thread and also the features page of PENTAX K-3 Mark III - Ricoh, where they state:
Forum: Pentax K-3 III 05-08-2021, 06:58 PM  
AF-C of K-3III is impressive
Posted By cfraz
Replies: 692
Views: 76,301
Hitchcock's "The Birds" came to mind when I saw that image.
Forum: Pentax K-3 III 04-27-2021, 05:23 PM  
Pentax K-3 mark III received today in USA
Posted By cfraz
Replies: 158
Views: 9,630
The "please buy our new camera" email or the "your new camera is shipping" email?
Forum: Pentax K-3 III 04-27-2021, 04:10 PM  
AF-C of K-3III is impressive
Posted By cfraz
Replies: 692
Views: 76,301
What I find a bit surprising (in a good way) is that focus was recaptured following the out-of-focus frames (8 and to a lesser extent several others you listed); this recapturing of focus occurred several times in the sequence. Especially significant for the final few frames, as the relative focus distance change per frame increases as the subject gets closer to the camera. Or to put it another way, the change in focus distance per frame may be only 5% of the focus distance when the train is far away, while it may be 30% of the focus distance when the train is close, which seems more challenging for the AF system to get right.
Forum: Pentax News and Rumors 04-27-2021, 03:42 PM  
New Firmware Released
Posted By cfraz
Replies: 305
Views: 26,386
Interesting. Apparently it uses a Linux bootloader called Stubby (I think U-boot is probably a more typical bootloader for embedded Linux). The Stubby readme file references the mb86s27 which is the 8th generation Milbeaut (Socionext) image processor. It supports full HD @ 120fps, 4K @ 30fps, H.264 codec - I guess that is already well-known.
Forum: Pentax K-3 III 04-02-2021, 03:17 PM  
Advantages of K-3 Mark III over the K-3 II
Posted By cfraz
Replies: 75
Views: 5,219
I could never find a -12.5 diopter (no - that's not a typo) viewfinder lens for my K-5 IIs so I had to wear my coke-bottle-bottom glasses or contacts. A replacement lens in my eye courtesy of cataract surgery solved the problem! Just another option, though it may not be widely applicable. ;)
Forum: Pentax News and Rumors 02-24-2021, 11:06 PM  
New K-3 III video from Ricoh: OVF face, eye and bird detection is coming.
Posted By cfraz
Replies: 229
Views: 28,375
6:06 - "It is a Pentax original smartphone that allows you to quickly select the functions and settings to be set."

Finally! That will surely quell all the complaints we've had on this forum.
Forum: Pentax News and Rumors 09-15-2020, 09:50 PM  
Patents possibly linked to the APS-C flagship
Posted By cfraz
Replies: 120
Views: 16,078
Interesting. If by "not using the SAFOX sensor anymore but the RBG sensor" you are saying the metering sensor completely replaces the PDAF sensor in K-new for autofocus duties, I'm not sure that all the bits of info we have so far add up to that conclusion.

Early images of the K-new with no lens installed apparently showed the reflection of a larger (than in K-3) PDAF sensor under the mirror box, implying a larger coverage area. The cutaway drawing showing the new prism arrangement also shows a large area below the mirror box - I don't see the purpose of that space if not for a PDAF sensor.

I think prior Pentax cameras used the metering sensor to assist autofocus in tracking objects (by color, maybe shape), essentially giving the system cues on which PDAF point to use as object moved across the frame. My take on this may be completely wrong.

The sensor in the patent seems to be a Foveon-like sensor. Maybe it can be used together with a PDAF sensor to enhance the AF system? Or maybe the patent is for a future camera's AF system? Anyway, I'd be surprised if K-new doesn't use PDAF. I have no idea if they'll call it SAFOX or something else. But this is all guesswork by me based on what I think I know - again I may be completely wrong.
Forum: Pentax News and Rumors 08-25-2020, 10:30 AM  
Another snippet from Pentax HQ
Posted By cfraz
Replies: 410
Views: 34,161
I remember one of the first interviews conducted by PentaxForums with a Pentax executive from Japan. It seemed obvious to me that the executive, while appreciative of PentaxForums, was not all that familiar with what the forum was about. He seemed completely surprised to learn that PentaxForums had a virtually complete database of all Pentax lenses, for example.

The latest Ricoh financial reports show that for the year ended March, 2020, the "Other"* business unit category, sales for The Americas was about 2% of Domestic sales (2.9 vs. 150.4 billion yen). Europe, Middle East and Africa totaled about 3% of domestic sales.

Recognizing that Ricoh Imaging may just be a small part of "Other," and Pentax a small part of Ricoh Imaging, one cannot assume the 2% figure applies to Pentax brand. But I think there is a significant possibility that we PentaxForumites have an inflated view of how important we are to the Pentax brand.

* In the past, Ricoh Imaging (which includes Pentax brand) was part of "Other." I didn't see Ricoh Imaging referenced at all, but am assuming it's still part of "Other." If someone knows better, please correct me!
Forum: Pentax News and Rumors 08-12-2020, 08:46 PM  
R03010 = K-new was registered by FCC on 27 July 2020
Posted By cfraz
Replies: 238
Views: 29,324
From Ricoh's press release* on Jan. 26, 2017 announcing the KP, linked by kwp in post #138 of this thread:

1) The notation tagging the press release:


New release of PENTAX KP, a middle-class digital single-lens reflex camera equipped with the new APS-C size sensor

2) The title of the press release:


Middle class digital SLR camera equipped with new APS-C size sensor

3) The first paragraph right after pictures of the KP:


Ricoh Co., Ltd. (President: Zenji Miura) and Ricoh Imaging Co., Ltd. (President: Noboru Akabane) have a compact body that can be carried around every day, high basic performance that supports full-scale production, and photographers and shooting scenes. We are pleased to announce the release of the PENTAX KP, a middle-class digital single-lens reflex camera with a variety of customization functions to suit your needs.

Ricoh Co. president and Ricoh Imaging Co. president both clearly and without ambiguity identified the KP's place in the Pentax line-up with no bumbling, before any outrage, before the camera was sold.

Unfortunately, Ricoh USA executives waffled on the issue, but they only distribute product. I'm not sure why we give so much weight to what Ricoh USA folk said in interviews vs. what company officials who planned, designed, and brought the KP to market actually wrote about it.

* Translation by Google Translate, highlighting added.
Forum: Pentax News and Rumors 08-04-2020, 10:01 AM  
Meet the new flagship
Posted By cfraz
Replies: 765
Views: 83,256
All those people who a wanted long-bed, crew-cab, auto tranny, center console, 3-DIN radio and trick tailgate pickup and bought the Tundra must be really, really mad at Toyota now.
Forum: Pentax News and Rumors 09-05-2019, 10:22 AM  
New Sony APS-C Sensor - 26MP
Posted By cfraz
Replies: 1,219
Views: 104,877
Fixed it for you...
Forum: Pentax News and Rumors 04-02-2019, 07:37 AM  
Pentax ME-D!!!
Posted By cfraz
Replies: 66
Views: 17,259
And the Minox Mini-ME
Forum: Pentax News and Rumors 03-12-2019, 04:37 PM  
Ricoh booth at CP+
Posted By cfraz
Replies: 476
Views: 47,231
Sort of a Q-"H" sensor, then?
Forum: Pentax News and Rumors 11-27-2018, 09:40 PM  
Amateur Photographers (UK) Predicts End for Pentax
Posted By cfraz
Replies: 1,318
Views: 103,172
To add to Mark's comments: A FF pentaprism is much larger and heavier than it's APSC cousin. Also, the FF mirror box needs to be able to swing a mirror that's about 50% wider.
Forum: Pentax News and Rumors 10-06-2018, 07:11 AM  
K3ii replacement
Posted By cfraz
Replies: 2,451
Views: 224,129
Like they did with the K-3 series? The K-3 II is lighter than the K-3.

Yes, Pentax cameras generally are heavier than other brands which lack IBIS and magnesium body shells.

No, the K-3 does not weigh more than a D750. No matter how many times you repeat it (and ignore another poster's reminder to check your facts). The K-3 II is 50g lighter (body only) than the D750, the K-3 is 35g lighter (body only). With battery and memory card, the differences are even greater: K-3 II is 55g lighter, and K-3 is 40g lighter than D750.

D750 from Nikon | Imaging Products | Nikon D750:

K-3 II from Specifications? PENTAX K-3 II | RICOH IMAGING:

K-3 from Specifications?K-3 | RICOH IMAGING:
Forum: Pentax News and Rumors 05-24-2018, 02:27 PM  
New gear on Photokina
Posted By cfraz
Replies: 21
Views: 4,530
In contrast to this kind of self-important post?
Forum: Pentax News and Rumors 05-04-2018, 11:06 PM  
February 2018 CIPA numbers are in... the DSLR lives!
Posted By cfraz
Replies: 165
Views: 20,295
Lots of talk about sales figures but I haven't seen much about *usage* data. So I'll throw in my purely anecdotal data point.

I recently spent a week at Southern California theme parks. I saw *lots* of DSLRs, ~100 +-20%, 4 or 5 MILCs and tons of cellphone cameras. The big surprise to me - 15 - 20 film SLRs.

I'm not sure there is a strong correlation between camera type purchase and actual use.
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