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Forum: Pentax News and Rumors 10-29-2020, 11:44 AM  
Get ready for a November giveaway & December lens tournament!
Posted By Kobayashi.K
Replies: 124
Views: 4,518
Hi Colton. I don't often post on this forum but I frequently visit the Pentax Film SLR Discussion section and enjoy your photos (and the photos of others) because of your minimal approach and the colors. I'm not sure you would like to work with a digital camera though (if you win one).
;)
Forum: Pentax News and Rumors 10-29-2020, 09:29 AM  
Get ready for a November giveaway & December lens tournament!
Posted By Kobayashi.K
Replies: 124
Views: 4,518
So each year we get this giveaway event rewarding people who can produce as many crap posts as they can in a short time. As if we haven't enough of that in the News and Rumors section. This rewards the opportunists instead of long term users with high quality posts who now get frustrated by this iniquity and perhaps reduce their input or even quit.

What should happen is to organize a poll in which all members can vote which posters consistently had high quality contributions last year (in their view) with helpful information, photos, or sharing tidbits from their projects they put a lot of work into. The winners not only get some highly valued hardware but they can also feel proud of the appreciation from this forum. A positive side-effect is also that another person is awarded instead of harvesting an advantage for yourself.

As an example, my personal vote goes to @Swift1 (Colton Allen) because despite the difficult circumstances he lives in he is able to share high quality photos everybody can enjoy, and @photoptimist who consistently comes up with useful and surprising info, and @The Squirrel Mafia with enthusiastic reports how to use RawTherapee.
There are many more and everybody has his own preferences, but I think an approach like this will be much more advantageous for Pentaxforums in the long term.
Forum: Pentax News and Rumors 07-04-2020, 01:21 PM  
Sticky: An important message from the moderators
Posted By Kobayashi.K
Replies: 323
Views: 34,022
I'll predict that this type of micro management as proposed by Adam will not work. It is more of the same, it costs too many resources and too much time. Look at the can of worms represented by the reactions on this post to get an idea.

What is needed on PentaxForums is an AI system which monitors all posts, analyses the contents, and collects a subset which can be analyzed by the mods and further reduced to compile a list with offenders which are given a warning.

An AI system will not work perfectly from the beginning but it is a good investment, because but it can learn over time and become better and better. The mods are still present as the human factor, and they keep an eye on the performance of the AI system.

It would be wise not to take advise or use software from Google and the like, because that would inevitably lead to privacy issues. My take is that Microsoft would be a good partner, because they have all kinds of services scalable to small and large businesses.

Learn how Microsoft AI is helping your industry
Artificial Intelligence in Business - Microsoft AI
Forum: Film Processing, Scanning, and Darkroom 05-17-2020, 08:26 AM  
Drum scanning services?
Posted By Kobayashi.K
Replies: 14
Views: 1,022
When I scan my 35 mm B&W negatives with a Pentax K-70 I have a resolution of about 4200 dpi (sensor 6000 px wide, frame 36 mm wide). However, when pixel shift is used I still see an improvement of the definition of the grain. So I assume a resolution 4500 .. 5000 dpi is optimal.

The opinions on this differ, how far you must go, but I think an essential property of film is the grain, and it should be reproduced in a scan.
Forum: Pentax SLR Lens Discussion 05-13-2020, 11:05 AM  
How To Get The iPhone Generation To Give Real Cameras & Vintage Lenses A Try?
Posted By Kobayashi.K
Replies: 37
Views: 1,436
Why would you want to convince someone to use manual focus lenses. The fact that you like that personally is not a good reason. If someone is interested in photography and you want to help them, take a neutral position and present them with the possible alternatives, mentioning the pro's and con's, and let them judge for themselves.

Edit - To be clear: I shoot both film and digital and always use manual lenses on all cameras.
Forum: Pentax News and Rumors 05-13-2020, 10:01 AM  
PENTAX new product introduction video coming soon
Posted By Kobayashi.K
Replies: 286
Views: 20,142
I translated the Japanese text in various translators (Google, Bing, DeepL, Translate.com and Babylon NG) and it is a mixed bag: some are saying 'lens' and 'APS-C flagship', others 'lenses' and 'APS-C flagships' (plural), or combinations of them.
Forum: Pentax Camera and Field Accessories 05-12-2020, 01:26 PM  
Any experience with Gobe filters?
Posted By Kobayashi.K
Replies: 11
Views: 803
A point to examine is the material of the ring, which can be brass or aluminum. The latter tends to stick and when that happens they can only be removed with a tool. I always buy B+W or Heliopan filters, they are brass. Also important is the height of the ring when you use a screw-in hood on the filter. Most rings are very thin, the B+W F-Pro filters are 5 mm high though, all the Heliopan's have a medium height.

p.s. Can't find any specs for coatings or transfer functions or downloads on Gobe's home page (https://mygobe.com/).
Forum: Photographic Industry and Professionals 05-12-2020, 04:25 AM  
Pentax K-3 II successor on September 2020
Posted By Kobayashi.K
Replies: 961
Views: 84,201
So what's the point of joining PentaxForums when you encounter the flippy screen and video zealots everywhere.
Forum: Pentax Medium Format 05-06-2020, 09:29 AM  
medium format and dimensionality
Posted By Kobayashi.K
Replies: 46
Views: 3,248
I believe the word 'dimensionality' has no meaning in photography, I never came across this term before. It is coined by OP because he can't quantify the effect.

A photo like the one from Phil (post #19) has a number of well known properties: high resolution, sharpness, sufficient contrast, and a full and well balanced range of gray values (for B&W). I would say the combination of them all can be called tonality.

That's all you need to explain the effect, nothing new here. In this case, the impression of a pleasant tonality is amplified by the fact that it is a B&W photo. The impression of depth is amplified by the perspective. A subtle toning is also added to make the tonality look creamy.

I'm convinced that Pixel Shift also enhances the effect:
Pixel Shifted Images - PentaxForums.com

Many stunning photos there.
Forum: Film Processing, Scanning, and Darkroom 05-06-2020, 05:11 AM  
Developer questions
Posted By Kobayashi.K
Replies: 30
Views: 1,573
Thanks @fs999. Yes this version is even more diluted than all the others. As a side note, when I see that I wonder why people are inventing another version with an exotic name instead of simply diluting the CL 1+1 or more.

I also shoot a limited number of rolls a year, so I'm also interested in longevity. Good luck Jonathan with the Rodinal, keep us informed.

Personally I'm going the Caffenol route first with -CL to see how it compares to Perceptol (on FP4+). An advantage of Caffenol is also that you can pour it down the drain.

BTW Kodak recently changed the formula of HC-110, so that could potentially change its long shelf life. Perhaps they have taken a leaf out of Tetenal's book.
Forum: Pentax Medium Format 05-03-2020, 12:58 PM  
medium format and dimensionality
Posted By Kobayashi.K
Replies: 46
Views: 3,248
Isn't this simply a question of tonality. It is a well known property in analogue photography that a larger format gives (can give) better tonality. But I think it is less well known among digital users. The differences in sensor size we are talking about here are relatively small so the effect is less visible anyways.

See also
Why are FF images so much more pleasing than APS-C? - PentaxForums.com
Forum: Troubleshooting and Beginner Help 05-03-2020, 04:41 AM  
Firmware Update
Posted By Kobayashi.K
Replies: 5
Views: 809
What @Sandy_Hancock said.

A full recipe how to install the update is here (follow the points in 'Updating Procedure'):
Latest PENTAX K-70 Firmware Update : Software Downloads | RICOH IMAGING

Notice that Pentax firmware updates are cumulative, which means that the last update also contains all the previous updates. You can update from any version you have on the camera.
Forum: Pentax Camera and Field Accessories 05-02-2020, 03:36 PM  
How do you organize your filters?
Posted By Kobayashi.K
Replies: 17
Views: 1,082
All my small camera parts [1], including filters and hoods, are stored in Sistema Klip-it 3 litre boxes. These boxes are stackable, transparent for easy viewing, and with labels on one side with info what's inside. When I need more room I just buy a few extra of these boxes (with consequently the same size to keep it systematic) and they are added to the collection which is displayed in a cupboard in my study.

[1] Lenses, caps, batteries, chargers, grips, angle finders, eyepieces, data backs, adapters, extension tube sets, film holders, cables, straps, screws, small tools, SD memory cards, silica gel etc.
Forum: Pentax Camera and Field Accessories 05-01-2020, 11:10 AM  
Quick release straps
Posted By Kobayashi.K
Replies: 9
Views: 813
Nah, if you have a bad taste selecting a strap, how can you make an aesthetic photo.
Forum: Film Processing, Scanning, and Darkroom 04-30-2020, 11:39 AM  
Developer questions
Posted By Kobayashi.K
Replies: 30
Views: 1,573
Caffenol can be made 'just in time' and directly used, so that would eliminate the storage problem. Isn't there a version that delivers fine grain?
Forum: Film Processing, Scanning, and Darkroom 04-30-2020, 09:27 AM  
Developer questions
Posted By Kobayashi.K
Replies: 30
Views: 1,573
When a bottle of Rodinal can last years, and many people are buying it for that reason, the manufacturer obviously has small sales. To resolve that they can't change the formula to make it more disposable (the 'Rodinal' label can not be used any more), so a sneaky solution could be to change the bottle to allow faster oxidation. What you can do though, when the type of bottle is indeed the culprit, is to decant it in a (dark) glass bottle after purchase, and see what happens with it.

Edit: I see now this solution is also mentioned briefly in the linked thread.
Forum: Film Processing, Scanning, and Darkroom 04-29-2020, 09:08 AM  
Developer questions
Posted By Kobayashi.K
Replies: 30
Views: 1,573
The chemical ingredients in a package of powder are not evenly distributed, it is very difficult to achieve that (ask a chemical lab assistant). So, if you use 1/10th of the package and mix it up the resulting developer behaves inconsistent because the composition of chemicals may vary.
Forum: Film Processing, Scanning, and Darkroom 04-29-2020, 07:31 AM  
Developer questions
Posted By Kobayashi.K
Replies: 30
Views: 1,573
Even if you buy powder it must be mixed up from the complete package, because the powder consists of various ingredients that could be mixed uneven when only part of the package is used. So in practice usually the minimum amount of developer you make from it is 1 litre.

Ilford also makes powder developers for B&W: ID-11, Perceptol, and Microphen (and perhaps more).
I use ID-11 as a universal developer, Perceptol for fine grain on HP5+, and Microphen as a fine grain speed enhancing developer on FP4+.

Edit: Perceptol has a capacity of 4 films / litre, for ID-11 and Microphen it is 10 films.
Forum: Pentax DSLR Discussion 04-18-2020, 04:04 AM  
DSLR as webcam?
Posted By Kobayashi.K
Replies: 30
Views: 5,698
Take a look at the Ricoh Camera SDK for remote control of the camera, not all cameras are supported though.
RICOH Camera SDK
Forum: Pentax DSLR Discussion 04-09-2020, 02:25 PM  
Back up 2nd Camera
Posted By Kobayashi.K
Replies: 28
Views: 1,186
Besides the camera body you also need a backup battery charger, because in this case of the K-70, when the charger dies the camera is a brick; it has no option for a battery grip (for AA batteries).
So ideally the backup camera should have the same type of battery as the K-70, and a charger should be included if you buy used.
Forum: Pentax K-30 & K-50 04-07-2020, 07:45 AM  
AF fine adjustment - clarification please.
Posted By Kobayashi.K
Replies: 9
Views: 1,023
Thanks. The difference between AF and Manual is that the former uses a feedback loop with the focus motor involved. In Manual the loop is cut open and only the phase detect part from the AF module is used, so that would potentially change its behaviour. I'm going to read the threads provided by @MarkJerling and @Adam to understand it fully.
Forum: Pentax K-30 & K-50 04-07-2020, 03:50 AM  
AF fine adjustment - clarification please.
Posted By Kobayashi.K
Replies: 9
Views: 1,023
Do you need AF fine adjustment on manual lenses (or AF lenses used manual) when the hexagon focus indicator in the viewfinder is used as a confirmation?
Forum: Pentax DSLR Discussion 04-01-2020, 09:50 AM  
Focussing for sharp images.
Posted By Kobayashi.K
Replies: 52
Views: 2,730
For more sharpness get a K-70, set Recorded Pixels to 14M and use Pixel Shift?

I guess it depends how Pixel Shift is applied, before or after resampling to 14M what happens. Anyway this is only a thought experiment.
Forum: Pentax DSLR Discussion 04-01-2020, 06:49 AM  
Focussing for sharp images.
Posted By Kobayashi.K
Replies: 52
Views: 2,730
Yet another obstinate person here.

The problem with using a tripod is that it kills spontaneity. I am already shooting for many decades on film and digital. And I always shoot B&W which is about patterns and structures. So, my brain is programmed to detect those patterns an structures intuitively and I shoot them immediately when encountered without giving it any thought, analysing a scene consciously, or changing position to make it 'better'.

This approach requires quick shooting handheld to maintain spontaneity and in practice it delivers excellent footage which can be tweaked in post. I experience shooting handheld is convenient and more fun.

The camera I use is 16 Mp (see post #47, @gatorguy) with a battery grip attached to make it heavier for more stability, a short lens of 20mm (APS-C) or 28mm (film), and the aperture mostly set to f/8. I also prefer sunny weather which increases sharpness indirectly because you can use a faster shutter time at the same ISO (and it gives sufficient contrast, which is important for B&W). In practice nearly 100% of my photos are sharp, but I don't print so that's an advantage.
Forum: Pentax Film SLR Discussion 03-31-2020, 09:37 AM  
Can I save my LX screen? I messed up....
Posted By Kobayashi.K
Replies: 31
Views: 2,025
It's a guess how the screen is actually made with this little information, and how the damage is done. But the info from Phil also points to a coating. The important conclusion for this thread is not to use IPA.
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