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Forum: Pentax K-3 III 11-20-2022, 02:57 PM  
Still struggling with AF
Posted By ramseybuckeye
Replies: 29
Views: 1,279
Unless it is very still, water is hard because there are many many high contrast spots that continually move. Single spot through the viewfinder works better than anything else for me, but I've never used live view in this type of image, because I wouldn't use a tripod shooting birds, only for landscapes of non moving subjects.
Forum: Pentax KP 11-02-2022, 03:54 AM  
Post Your Best KP Shots
Posted By edri
Replies: 4,078
Views: 399,423
KP + DA70mm Limited

Forum: Weekly Photo Challenges 11-17-2022, 08:35 AM  
Weekly Challenge Weekly Challenge #594 - Break the Rules - Winners
Posted By Vaskebjorn
Replies: 5
Views: 357
Congrats to the winner(s) and thanks to hcarvalhoalves for the great challenge.
Forum: Weekly Photo Challenges 11-17-2022, 08:07 AM  
Weekly Challenge Weekly Challenge #594 - Break the Rules - Winners
Posted By NatureHike
Replies: 5
Views: 357
Congrats all, three great photos!
Forum: Weekly Photo Challenges 11-16-2022, 02:30 PM  
Weekly Challenge Weekly Challenge #594 - Break the Rules - Winners
Posted By jacamar
Replies: 5
Views: 357
Thanks hcarvalhoalves. The shot was taken with the k-3iii and the 35mm f2.8 Macro Limited, during a workshop with Freeman Patterson (who wrote the book on breaking the rules) in New Brunswick. It would have been a good idea to have cropped around one of the brighter areas, but I was a bit hesitant that that might have been too much - so I just left it as an overall "mood" image with a bit of "Where the Wild things Are" to it. I suppose lack of subject was one of the rules broken. Again, thanks for giving it the nod.
Forum: Weekly Photo Challenges 11-11-2022, 06:27 AM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By jacamar
Replies: 16
Views: 780
Evening forest by Steven, on Flickr
Forum: Weekly Photo Challenges 11-10-2022, 12:37 PM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By jchorst
Replies: 16
Views: 780
Totally unbalanced.
Forum: Pentax News and Rumors 11-10-2022, 01:58 PM  
Pentax KF
Posted By borisII
Replies: 425
Views: 29,298
The situation is strange. I believe that the release of the camera is an unequivocal answer to the fact that they will not develop a budget niche.
I aslo believe that MF is dead - Ricoh completely failed the competition with Fuji and Hassel and nothing has been heard about 645 for a long time. The 645Z is outdated and costs $7,000. Let me remind - it was released 8.5 years ago.

We hope for K-1III - heavily tweaked in the spirit of K-3III. Nothing else is expected.

Most likely, it is naive to expect progress from Ricoh. It is a pity that KP was discontinued. It's sad that there is no available camera even with 27 autofocus points.

An expensive crop, an expensive FF and a completely backward pseudo-budget camera (also expensive for their niche).
No disappointment at all, but I try to understand the way of Ricoh...but can't.

Maybe it's just hobby of president of Ricoh Imaging?
Forum: Pentax News and Rumors 11-10-2022, 02:06 PM  
Pentax KF
Posted By The Squirrel Mafia
Replies: 425
Views: 29,298
Ricoh's gonna do whatever Ricoh wants to do & they don't care what Pentaxians or anyone else thinks. That seems to be their mantra. Hahaha! :p
Forum: Pentax News and Rumors 11-10-2022, 12:43 AM  
Pentax KF
Posted By beli_delfin
Replies: 425
Views: 29,298
Guys at DPreview are right. Basically KF is a waste of resources for Ricoh/Pentax and just a try of revival of K70.
It would be better to put all resources in enhanced K1 and lower the price of K3 mk III. Ricoh/Pentax has to improve their technology a lot to compete with modern mirrorless competition with K1.
For approximately the same price as K3 mkIII you can get OMD E-M1X and brand new OM5, Fuji XPro III, brand new XT5 or XT4, Sony A7c and a6600, Canon R and R7, Lumix S5 and GH5 mk II to name just a few. A looooot of competition.
And with KF now they basicaly put a 6 years old camera on a market to compete with at least 10 other cameras. Woul be interesting to know how many they will actually sell.
Forum: Weekly Photo Challenges 11-09-2022, 12:59 PM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By noelcmn
Replies: 16
Views: 780
How to ruin your career as a Portrait Photographer
Portrait fun with the FIsheye by Noel Bowers, on Flickr
Forum: Pentax DSLR Discussion 11-08-2022, 11:31 AM  
The New Pentax K-WOW
Posted By TaoMaas
Replies: 35
Views: 2,275
Count me as another one who think Pentax needs to up their video game. I've been a loyal Pentax user for 50 years and am one of the 2 or 3 members of my camera club who still shoot with Pentax...and there used to be a bunch of us. Pentax lost most of those folks by being slow to embrace autofocus and I think they're doing a similar thing these days by ignoring video. Personally, Pentax's video quality...or lack of...has forced me to buy a used GH-4 for my video shooting and lately I've been pricing the Sony A7sii for the same reason. If they're not going to improve their video quality throughout their line, then maybe Pentax could release a single more video-centric camera. A K-02 perhaps? Heck, I'd even settle for a speed booster that would let me use my Limited lenses on my GH-4 with more functionality.
Forum: Pentax DSLR Discussion 11-09-2022, 12:37 AM  
The New Pentax K-WOW
Posted By Cerebum
Replies: 35
Views: 2,275
Full frame? Bigger lenses? More weight? Nah, I will stick with my small and breathtakingly cool KP with its wonderful (for me) ergonomics. OK, I want a K1 but I have zero cash so that will have to wait. The KP is eminently customizable for jpeg shooters, the third wheel, flip screen and swapable grips are superb, the IQ is excellent, the accelerator chip means I can ramp up my iso when I need to (it blows my K3 out of the water in this regard). Auto focus is accurate and plenty fast enough. As for shooting, I live in aperture priority, back button focus, entire exposure triangle at my fingertips. I sometimes use CTE WB and pixel shift occasionally but all the other tricks, whilst nice to have, I don't use. Wish list, maybe a top LCD and a bigger battery but not at the expense of the lovely small form factor. The KP has the classic look of my MX, particularly in silver, with the smallest grip and sporting a limited prime. Mine is up to 35k clicks without a hitch so, for me, my wish list would be to put the KP back into production.
Forum: Weekly Photo Challenges 11-08-2022, 06:32 PM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By Hattifnatt
Replies: 16
Views: 780
A portrait with the DA 15mm Limited.

Anca by Hattifnattar, on Flickr
Forum: Weekly Photo Challenges 11-08-2022, 05:47 PM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By NatureHike
Replies: 16
Views: 780
My entry. This is from this past weekend. A cigar plant with the DA 10-17. Breaks the rule of "don't hold the camera like a drunk" as well as maybe not so much a rule as a tradition of not using ultra wide angles for closeups. Also has a fairly distracting background. I thought it all came together to make a pretty cool and unique photo though.

Forum: Weekly Photo Challenges 11-08-2022, 04:57 PM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By ramseybuckeye
Replies: 16
Views: 780
I took this one last night, not because of this challenge, but I actually liked it this way, vertical landscape, the sun is nearly in the middle of the frame, and it was shot at 420mm, DA*300 and DA1.4 TC. I don't know why, but if I have this combo with me when shooting sunrise or sunset, I got to take a few at 420mm.

The Sun Between by Tom Ramsey, on Flickr
Forum: Weekly Photo Challenges 11-08-2022, 05:16 AM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By atupdate
Replies: 16
Views: 780


Tim
Forum: Weekly Photo Challenges 11-07-2022, 02:45 PM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By Kerrowdown
Replies: 16
Views: 780
It's the most awkward composition I could reasonably find quickly... but "wot a belter". :lol::lol::lol:
Forum: Weekly Photo Challenges 11-07-2022, 01:05 PM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By ismaelg
Replies: 16
Views: 780
Hello,

Vertical landscape, centered, mid day harsh light.


Thanks,
Ismael
Forum: Do-It-Yourself 03-20-2020, 02:12 PM  
Rebuilding a pentax D-Li90 battery
Posted By marcusBMG
Replies: 13
Views: 3,602
UPDATE: There are some other threads discussing batteries and battery capacities; FYI:


https://www.pentaxforums.com/forums/22-pentax-camera-field-accessories/42336...batteries.html

https://www.pentaxforums.com/forums/210-pentax-k-3-iii/427215-battery-question.html

https://www.pentaxforums.com/forums/6-pentax-dslr-discussion/422347-wasabi-b...rebuild-2.html

https://www.pentaxforums.com/forums/22-pentax-camera-field-accessories/34794...batteries.html

In particular photogem has been inspecting 3rd party batteries and comparing to original pentax batteries. He has observed:
- a lot of lower quality generic cells in the 3rd party batteries.
- the 3rd party batteries don't have a thermal sensor.
- or a balance charging BMS.
His review of a Wasabi battery is here. A significant risk with the 3rd party batteries is swelling. A significant advantage of rebuilding is maintaining quality.


Also PF member eccs19 (Mark Evers) has made this YouTube video:
















You Tube






As Li Ion batteries age the charge capacity steadily diminishes. As you can see in the first pic, the test result for one of my D-Li90's is now only 985mAh*, ~ half the original spec capacity of 1860mAh. It is a pretty old battery, the date code is 201009 ie this is over 10 years old so it's done pretty well.
While both pentax and third party batteries are readily available, the pentax battery is overpriced and you don't really know what the quality is of the third party ones. My own experience of buying and checking Li Ion battery cells is that outside of the main brand names like panasonic, samsung etc it's a bit of a lottery, the market is riddled with low quality or dodgy cells (especially ebay - for examples of really dodgy cells check out














You Tube



- anything advertised with an OTT capacity rating ie above ~3500mAh can be assumed to be dodgy).

So the advantages of rebuilding are 1. cost and 2. quality control.


WARNING. This is what I did. You engage in something like this at your own risk. It is up to you to have sufficient diy and electrical know how. Don't disassemble a battery that hasn't been discharged. Take proper health and safety precautions.
TOOLS: modelling knife, soldering iron, plastic glue, gluegun. Multimeter useful for testing. Spot welder ideal for reassembly.
  1. The two halves of the case are glued/sealed together. I worked the tip of a knife blade along the join to separate. PIC 1

  2. The battery is a straightforward 2S/1P, 18500 cells (ie 18mm dia, 50mm length). There is a balance charging connection BC and a small control board CB. The MH12210 ID'ed these cells as panasonic. PIC 2.

  3. The cells are stuck to the base, ease out carefully. Note the polarity arrangement. I have already pulled off the spot welded link strip on the R ends. PIC 3.

  4. The control board is going to have to be soldered off to access the cell ends. PIC 4. The end solder points S are the ones. I intend to use the same connectors and (later) used some desolder wick to (partially) clear the connection points. PIC 5.

  5. These are the connectors. I used a dremel to remove them without bending/twisting. PIC 6.

  6. It is a good idea to use identical new cells. As well as varying capacity and quality, different cells are designed for different purposes eg high current for drills and tools. I think these are more oriented to capacity and durability. Panasonic MH12210 replacement cells are available from a number of suppliers, typical cost seems to be ~6 each (UK). The supplier I enquired with (ecoluxshopdirect.co.uk) were out of stock but advised that the slightly cheaper Amsplus cells were essentially identical quality and spec so I went with that.

  7. A gluegun is standard for joining cells into a block PIC 7. The tags can be soldered back on but I have the right tool for this job, my newly commissioned MOT spot welder PIC 8.
    If you are soldering, it is a bit more risky, in fact the seller of the cells I bought remarked that he had had a customer who had had problems soldering cells for a camera battery. My own tips: lightly sandpaper the surfaces, good quality flux, "hoof" profile soldering iron tip, Pb/Sn flux cored solder seems to work best. Also there is little room in the case for "lumpy" soldering, you will need to try to make the joint as flat as possible.
    The rear tags are straightforward, then the front tags and control board are the ticklish part. I used bluetac (less secure, easier to microadjust position)/double sided sticky tape (more secure) to carefully position and hold the tags PIC 9 .

  8. Then resoldering the control board went smoothly, just a second or two contact with the iron and the old solder melted and the tag came though the slot.

  9. I now had a disconcerting moment when I couldn't get a voltage reading out of the battery. But the battery started charging fine (case left open to observe, check temperature by touch PIC 9) so it was just the control board registering that the cells were low and doing its job, switching the battery off.

  10. I suggest either a cyanoacrilate superglue, or plastic-weld solvent (I used the latter) to rejoin the case. Done (pic 10), battery works perfectly.

Overall I can say this is a straighforward, easy in fact, little diy exercise.

*except that later I realised that the Imax was faulty, consistently under-rating all the cells I tested with the discharge capacity function! The true capacity of the DLi90 was probably around 1500mAh - still significantly down on its rated 1800mAh.
Forum: Weekly Photo Challenges 11-07-2022, 10:48 AM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By aaacb
Replies: 16
Views: 780
exposed darker than the meter would say, letting the shadows lose all detail

Forum: Weekly Photo Challenges 11-07-2022, 09:34 AM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By Yaki
Replies: 16
Views: 780
This picture breaks almost every rule of composition Most of them intentionally. This way it reveals the vivid chaos and the condenced power of a small club Rock concert. :cool:

_YAK1021Etalon10y

p.s. by the way - Break the rules - sound pretty good as a rock concert title.
Forum: Weekly Photo Challenges 11-07-2022, 01:30 AM  
Weekly Challenge Weekly Challenge #594 - Break the rules
Posted By Vaskebjorn
Replies: 16
Views: 780
I actually shoot a bit more of 16:9 or rather 3840:2160 these days. This is caused by the fact that I got really disappointed with the prints I was getting from my printshop. So I decided to go the digital route and got myself a Samsung the frame. I sold it as a gift to myself obviously. The screenformat is as you guessed 3840:2160 and I can now change the “prints” as often as I want. The attached one is my current one. As this is a macro I hope this qualifies as “breaking the rules”

Hidden droplets by Richard Oude Egbrink, on Flickr
Forum: Pentax SLR Lens Discussion 02-01-2020, 09:01 AM  
Basic information for pentax lens protocol
Posted By Darkover
Replies: 23
Views: 2,694
Hi everybody,

I was curious about the comunication protocol. At first I checked the internet but I did not found so much. And most things I found are wrong. So I switch on my oszi and did some research.

Attachment 485869

On this picture you can find a complete exchange of data. The K1 did this three times in a second.

On most pages about Pentax mount they talk about a special digital pin for communication. I think this is wrong. The new pin for KAF is power supply for the lens.
The camera uses the SPI protocol, but without /CS. I think CS is not necessary because there is only one ASIC(old lens) or one microcontroller (new lens) inside the lens.
After the ASIC is switched on the camera start communication to the lens. For this it uses the old KA contact. I think there are resistor in the ASIC or lens-PCB so a KAF lens
on older KA mount shows correct values for aperture. On KAF or newer the lens transmit and perhaps accept data on this lines.
On the picture you can see it is possible to detect the 19 databyte from the lens. There is no EEPROM in the lens. I think it is a least an ASIC because they values are changing when you focus the lens or change the focal length. Of course I started with an old Pentax F35-135 1:3.5-4.5 becaue it is KAF.
On the new KAF4 the must be also a way to send data to the lens. I thing this is done with the MISO line. But this is untested.

There is only on surprise now. The camera deliver 4V to the lens. I think it is an unusual voltage. You would expect only 5V or 3.3V for this. The reason is perhaps that it is 5V but curent limited inside the body in case someone exchange the lens when the body delivers power.

The next point is to decipher the meaning of the 19 databyte. Until now this is an exercise for the reader. :lol:

The picture shows two analog channel and four digital channel from my oszi.

Olaf
Forum: Weekly Photo Challenges 11-06-2022, 03:40 PM  
Weekly Challenge Winners -#593 - Clouds
Posted By NatureHike
Replies: 4
Views: 292
Congrats y'all, those are awesome pictures.
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