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Forum: Photographic Industry and Professionals 05-13-2020, 04:30 AM  
Pentax K-3 II successor on September 2020
Posted By LukeOB
Replies: 961
Views: 84,528
Looks like we'll know a lot more on Friday :)

CP+2020 | RICOH IMAGING
Forum: Photographic Industry and Professionals 05-12-2020, 07:11 PM  
Pentax K-3 II successor on September 2020
Posted By Sandy Hancock
Replies: 961
Views: 84,528
Settle down folks. This debate has been done to death already....
Forum: Photographic Industry and Professionals 05-05-2020, 07:36 PM  
Pentax K-3 II successor on September 2020
Posted By Merv-O
Replies: 961
Views: 84,528
Well, if you rely more on video than still photography out of your Digital DSLR, then I can only refer you to the old adage: "I'd rather eat in a bar than drink in a restaurant".

Good luck in the land of cheaply mass-produced NikOnyCan oligarchy jack of all trade bodies. For many of us here though, the camera and the still photo is the art of the deal.
Forum: Film Processing, Scanning, and Darkroom 05-06-2020, 12:42 AM  
Developer questions
Posted By fs999
Replies: 30
Views: 1,588
Caffenol CLCS gives finest grain.

Forum: Pentax DSLR Discussion 04-01-2020, 05:44 AM  
Focussing for sharp images.
Posted By gatorguy
Replies: 52
Views: 2,768
Have you followed the shooters in the 6MP thread? A whole lot can be accomplished with a older basic digital camera. There's some great shots in that discussion.
The Six-Megapixel Club - Page 78 - PentaxForums.com

Personally I think anything 16MP and up is all most folks here need. Even as a "shoot now crop later" kind of guy, heavily at times I might add, 23MP has been more than enough. For most of us those 42MP and up photos will be wasted pixels for the most part, never needed for what we do with them and that excess discarded when we finish processing. They suck up computer resources and processing time for little reason.

Yeah there's a tiny segment that might occasionally print larger than an 11x14 and maybe they need all the pixels they can get, but heck I'd guess most of us don't print our images to begin with. Personally maybe 1 in 200 of my processed images actually gets printed. The rest are digitally shared or simply kept on file to look over someday, never put to paper.

I guess that puts me up to 4 cents worth now. :)

EDIT: I've owned a reasonably successful graphics firm for over 3 decades, with more than two decades now in an in-house large-format commercial print service and outsourcing of grand-format up to 16 feet tall. I do have a bit of experience in the pixels vs. print arena.
Forum: Pentax Film SLR Discussion 03-31-2020, 12:07 AM  
Can I save my LX screen? I messed up....
Posted By Astro-Baby
Replies: 31
Views: 2,030
I have seen the glossy side of a Fujica screen survive some IPA but the matt side was wrecked. The matt side of a screen is finely ground producing a kind of frosted effect. The finely ground surface means the plastic particles are so fine they melt quicker under a hit of IPA.
Forum: Pentax SLR Lens Discussion 03-02-2020, 07:59 AM  
Is old glass really that good on DSLR
Posted By normhead
Replies: 138
Views: 6,477
Usually the guys who like old glass are paying more attention to the rendering and not so much to absolute sharpness. There is a myth that absolute sharpness creates the most likeable images. My polls have shown over and over again, it's not true. Many prefer a certain type of rendering, and often old glass can provide something modern glass can't. There are guys who check the sharpness, then decide if they like the image. Then they reduce the image in size not realizing that if they'd reduced the image in size before they decided whether or not they like it they would have preferred the rendering of a softer lens.

The only lens I've post in my tests that didn't get a lot of love was my FAJ-18-35. Even my kit lenses have held thier own (selected by the number of people who represent the size of group that would be average for the lenses tested.) And reduced in size, my FA 35-80 won one of the polls although it didn't rate well pixel peeping.

There is little that is as frustrating as the constant barrage of sharper is better people who completely dismiss the value of how a lens renders and image. There seems to be this theory that if you don't know how the lenses render, buy the sharpest. It's a lazy man's way to do it, but far from the best way, unless you like buying lenses you don't really like.

Personally, I would pick up my FA 35-80 instead of my DA 35 2.4. Even though it's much sharper, I don't like the rendering of the 35 2.4, and we've reached a point where most people can't see the difference between a good lens and cheap lens reduced to 3840x 2160.

The only lens I've found that almost no one prefers would be the FAJ 18-35. I'd ask those who are picky about sharpness as opposed to rendering to avoid broadcasting thier opinions. By my guess based on my polls, most of the forum prefer softer lenses with better rendering. The sharpest lens is never going to receive more than at most 30% preference in blind tests. You're far more likely to prefer a "softer" lens by about 2:1.

There is a lot of nonsense out there.

Most of the people who buy lenses for their sharpness would buy something else with more thorough testing based on what they actually do with their images.

I look at the rendering of my FAJ 18-35 and the rendering of sharper glass, and while the FAJ is noticeably softer, reduced to 3840x 2160 for display on a 4k TV, it's images have a character I quite enjoy, for $100 CAD. The differences are ridiculously small and confined to how much of a sign in the picture can be read as the print gets smaller. really, quibbling over absolute sharpness is ridiculous. Stick with "do I like the way it renders at the size I want to display it, and you'll be a lot happier and save yourself a lot of money.

I know there are those conceited enough to think they have to have every image they take of quality that can be blown up to 12 feet by 8 feet, but taking lens purchasing advice from those guys will cost you a lot of money for nothing if all your images are reduced in size before display.

I do of course realize that my testing is never going to get me invited up on stage at a photo expo by lens manufacturers promoting new lenses. I can live with that.
Forum: Pentax DSLR Discussion 02-27-2020, 01:11 PM  
Composition Adjustment v Tilt/shift Lens
Posted By bdery
Replies: 27
Views: 1,441
I compared the two options, to some extent, in this review:

Rokinon Tilt-Shift 24mm F3.5 Review - Introduction | PentaxForums.com Reviews
Forum: Pentax DSLR Discussion 02-26-2020, 06:00 PM  
Composition Adjustment v Tilt/shift Lens
Posted By mlt
Replies: 27
Views: 1,441
And one other option. If your subject is static, you can combine the sensor shift in each direction with panorama stitching of the 4 images to approximate a 27x39mm sensor :)
Forum: Pentax Camera and Field Accessories 02-06-2020, 12:06 AM  
Protector Filter vs UV Filter
Posted By PDL
Replies: 79
Views: 3,115
Most of us on this tread are not arguing the UV filters are for physical protection. Keeping lens hoods on will provide some protection but the best thing is:
Don't hit the front element of your lens or your camera body with sharp or even blunt things.
Don't drop your camera, especially lens first onto hard pointy things.

Use filters when there is blowing dust/sand/metal shavings etc.
Use filters when your brother or "friends" are out to mess with you and ruin your day.
Use filters when around volcanic processes (Yellowstone, Hawaii, parts of Iceland and New Zealand).

Just keep away from this guy who will drop heavy weighted threaded rod on you lens - just to prove a faux point.
Forum: Photographic Industry and Professionals 01-31-2020, 12:49 PM  
Pentax March 2020 Interview Questions (formerly CP+)
Posted By Paul the Sunman
Replies: 56
Views: 8,692
What is the future for 645?

Since Pentax seems to be putting all its eggs in the DSLR basket, will the OVF on future Pentax cameras evolve to incorporate some of the advantages of EVF?
Forum: Pentax News and Rumors 10-13-2013, 01:47 PM  
Something else coming before year end...
Posted By Ray Pulley
Replies: 196
Views: 43,188
If the in-body motor is fast and silent, why even bother to continue in-lens focus motors of any kind?

It is clear to me that screw-drive lenses are extremely reliable versus in-lens motor designs (of any brand, and yes, there have been issues with in-lens focus motors of other brands), and you pay for only one focus motor versus one with every lens. Pentax has a quick-shift design that works just fine with the screw drive as well.

The screw-drive lenses I have are faster than any SDM lens I have owned, and while they might not keep up with a ring-motor design, they have to be far cheaper to make.

Putting a motor in the lens also means that the lens will never perform any differently than the day it was designed. While you are stuck with the gear ratio chosen for a screw-drive design, with the motor in the body, you can improve it with every generation and all lenses will benefit.

You have to have an in-body motor anyway to keep the backwards compatibility that Pentax is known for, and the main knock I hear against screw-drive lenses is the noise (which I am sure is mainly the motor in the body), so a fast and silent in-body motor is a simple and brilliant solution.

I hope that Pentax continues to think out of the box and doesn't listen to the folks that want the brand to "me too" everything CaNikon does, as that will leave only one way to compete: price.

I was holding out for the discounted K5II, but I may have to scrape up enough for the K3 if the IQ looks good.

Ray
Forum: Pentax News and Rumors 10-14-2013, 07:13 AM  
Ricoh Imaging expected to make a profit in this FY
Posted By ogl
Replies: 39
Views: 7,818
Thanks a lot...:) I'm happy to be here again.
Forum: Pentax News and Rumors 10-01-2013, 08:56 AM  
another new image of K-3!?
Posted By Fogel70
Replies: 490
Views: 104,067
On your dedicated video camera. ;)
Forum: Pentax News and Rumors 09-30-2013, 03:10 AM  
Pentax K3 with 40 MP via sensor shift
Posted By tigrebleu
Replies: 129
Views: 27,259
Using sensor shift to increase resolution through multiple shots isn't new. Hasselblad has a MF digital camera that can take six, 50 Mpix shots and combine them into a single 200 Mpix image by means of shifting its sensor with the help of piezo-electric actuators.

H4D-200MS

The only drawback is that the camera and subject as to be completely still during the shot. The advantages are 1) by shifting up, right, right, down, left and then left (or left, left, up, right, etc., whichever), each photosite can capture all four RGB color components (green is present, which can greatly reduce demosaicing artifacts, and 2) by stacking four images on top one another, noise can be reduced from the signal four times instead of just one. (Unless the noise isn't reduced at all, in which case it would add up with each picture.)

The problem with RGB (or RGBG, to be more accurate) Bayer matrix filters, is that a sensor with 20 million photosites doesn't record each of the 3 primary colors on each of its photosites. Instead, 25% of the photosites record the red color, 25% the blue color and 50% the green color. The missing info is then made up by the in-camera software or the RAW converter software the photographer is using, generating false color, demosaicing artifacts and such.

By moving the sensor six times, the sensor used in the H4D-200MS can record all primary color for each photosite, which results in a theorical resolution of 200 Mpix. Of course, the apparent detail isn't increased as much as a 200 Mpix Bayer matrix sensor would provide. But the colors are much more accurate, and artifacts are next to inexistent. Overall, the visual level of detail of that 200 Mpix picture compares to that a 60 Mpix sensor, but with much, much more accurate colors and much less annoying jaggies and other demosaicing artifacts. But this camera is a specialized product, and was design to answer the need of a very specific market (making photos of works of art and other historical artifacts).

(Just like the latest Sigma Foevon sensor (which is made up of 3 layers of 15+ Mpix that add up to 45+ Mpix) can't beat a 36 Mpix D800 in terms of details, it does provide increase detail, up to that of a 24 Mpix sensor, but more accurate colors, less artifacts and less issues with diffraction because of a too high pixel density. While the D800 36 Mpix roughly has the same pixel density has a D7000 16 Mpix, the 24 Mpix D7100 has a higher density then both the D800 and D7000, which leaves you closer to the limits of diffraction. As a result, diffraction can appear at wider apertures on the D7100, like F/8 instead of F/11. Diffraction reduces sharpness and the level of detail, so the higher sensor resolution can prove counter-productive if shooting at small apertures.)

If Ricoh plans to use such a device to increase resolution, the shift maybe won't provide each photosite with a signal for each primary color, but would at least allow to have two out of the three colors, like RGBG being shifted to GRGB for a RG-GR-BG-GB sampling. That would still require some demosaicing, so the gains wouldn't be as impressive as with a full RBG capture per photosite, both in terms of color accuracy and demosaicing artifacts. But it would allow to increase the level of detail capture by a decent margin at a lower cost.

Some will call this a useless gimmick, other will welcome this added resolution, even if it's limited to still subjects with tripod photography.

Now if a manufacturer can manage to get a one pixel shift in four directions on such a large, 50 Mpix sensor like the one in the Blad, I don't see why they couldn't do it on a roughly 5 times smaller APS-C sensor with 2.5 times less resolution. Doing the maths, that's about 33% more linear total resolution per mm to deal with. A bit more challenging, but nothing that can't be handled, I would assume. Especially considering the shift would only happen in one direction (20 Mpix to 40 Mpix) instead of four (50 Mpix to 200 Mpix).

The question isn't can they do it or not, it's more, how much does it cost to implement such a technology into a camera (in short, how much higher must we sell our camera to get this stuff in, and will the camera's price remain competitive if we do so).

And that is a question I can't answer. But maybe some knowledgeable people know more about industrial processes and how such a device can add to the price of a DSLR.
Forum: Pentax News and Rumors 09-27-2013, 05:33 AM  
New image of K-3!?
Posted By awaldram
Replies: 538
Views: 99,087
Don't understand the draw of a plastic fantastic lucky bag slow FF Vs metal alloy weather resistant quick aps-c whoever makes them.

It's not really the same price at all.
Forum: Pentax K-5 09-11-2013, 07:20 AM  
sigma mini-wide11 2.8 28mm won't work on my k-5
Posted By scratchpaddy
Replies: 16
Views: 2,249
Take a look at this page:

Features and Operation of the Ka Mount

The contacts on your lens give the camera a binary code to signify what the lens' aperture range is. Each contact is one digit: a plastic (insulated) contact is a 0, and a metal (conductive) contact is a 1.

The code your lens is supposed to make is 011*10, where the * is the contact that tells the camera it's an auto-aperture lens. That code means f/2.8-f/22. The code your camera is getting is 001*10, which means f/4-f/22. The metal contact which is second from the bottom is not making contact, so the camera thinks it's an insulator, or a 0. It's either dirty or too far recessed to make contact. If cleaning it (use rubbing alcohol and a cloth) doesn't work, try putting a little piece of metal foil over it.
Forum: Digital Processing, Software, and Printing 05-04-2013, 03:18 PM  
Batch edit of exif to add copyright
Posted By LaurenOE
Replies: 41
Views: 13,897
Of course you could use ExifToolGUI and enter the following commands on the files.

exiftool -copyright="Your Name" -m -overwrite_original_in_place -P

and

exiftool -Artist="Your Name" -m -overwrite_original_in_place -P

All you need is the free ExifTool and ExifToolGUI

ExifToolGUI

Once the software is installed

1 - select the file(s)
2 - Enter the command
3 - observe the change.

Forum: Pentax News and Rumors 08-28-2013, 08:28 AM  
New HD DA Limited lenses
Posted By Deimos
Replies: 820
Views: 107,960
This place is starting to sound like dpreview. Just a bunch of whiners, many of whom have already left Pentax, but come back spitting venom over anything and everything done by a company who frankly is making smart business decisions. I guess the problem for many is Ricoh/Pentax isn't dying as fast as they had hoped.

Green or Red ring, seriously? Who gives a f#$k? There is a green ring on the kit lens and consumer lenses, its called differentiation. No more logo tackily glued on the front, its called cost savings, production efficiency and more elegant design. Nobody bitching in this thread would even want to buy these anyways as they already have the old versions, or a Nikon FF and guess what? They arent made for you anyways...they are made for new customers and new products to come. Prices are a bit high to start? Yeah its Pentax that is how every release starts off...

The problem with Ricoh and Pentax is not the company or their products it is the negativity of a bunch of cranky old whiners tired of their hobby with nothing better to do than put down progress and cry about everything that they have no intent on purchasing.
Forum: Pentax SLR Lens Discussion 08-23-2013, 06:39 AM  
DxOMark - Best lenses for your Pentax K-50
Posted By normhead
Replies: 25
Views: 7,987
That's a pretty much useless review.... because of the lenses not included. Lenses they didn't test, that I use, the the Sigma 8-16, Sigma 70 macro, the Tamron 90 macro, the DA* 60-250, the DA 18-135. Neither does it mention the 31 ltd, the 43 ltd, the 77 ltd, the DA*200 or the DA*300 As far as I'm concerned if you talk about the "best lenses for a K-50" and don't include the first three, you're just wasting everyone's time and actually doing a disservice to your readers. I suspect that DxO didn't rate the Sigma 70 and Tamron 90 because they are much higher rated on other systems and they don't want to have to explain that all over again. Most people would think, well a lens is a lens, when in fact the same lens has much different ratings on DxO depending on which system it's on, and despite the high scores in DxO sensor ratings, lenses rate very poorly when evaluated on Pentax systems. Nevertheless, IR uses the SIgma 70 for it's resolution tests so you can compare how different systems do with the same lens, something that's nice to know. DxO pretty much hides that kind of information.

The title of this article should be " We didn't test most of the lenses commonly considered to be the best lenses available for the K-50, but of the cheapies we did test... these are the best."

Personally I did a lot of research before I bought each lens, and looked at a lot of pictures. I'd put my group of lenses up against DxO's any day, I will have better results than they do and have a better collection of lenses. It's sad when a company that wants to make money providing a service doesn't even meet the level of understanding of many of the users of the camera when making this kind of recommendation. I hope no newbies read this crap.
Forum: Pentax News and Rumors 07-26-2013, 01:50 PM  
New Camera/s by Christmas
Posted By monochrome
Replies: 997
Views: 153,093
Are you freaking serious? This is precisely the time of year when representatives have the MOST information about coming models - this is the Holiday preview / order period, right now.

This is the period when a Sales Rep presents and gets a signature on Co-Op advertising contracts for the Holiday Sales period; when a Sales Rep arranges in-store seminars by the 90+ Trained Contract Demonstrators Pentax USA has hired for this Holiday Season; and the time when a Sales Rep contracts for special Hoilday Merchandising Floor Displays (yes, they are CONTRACTED) that tie in with whatever Holiday Marketing Theme RIAC has arranged.

So might a salesman who goes around from store to store know if something new / good is coming? He or she darned well better know EVERYTHING, because the store owner has no incentive to let Pentax back in the door on smoke and a kiss this time,.
Forum: Pentax News and Rumors 07-24-2013, 02:38 AM  
DXO Just reviewed the K-50
Posted By rawr
Replies: 33
Views: 8,724
A big deficiency of DxOMark's measuring system is that they don't calculate a fashion score, based on body colour options and general camera aesthetics. K-50 beats the K-5's and the K-30 in that department.
Forum: Troubleshooting and Beginner Help 07-11-2013, 11:03 AM  
Eye cup magnifiers
Posted By photolady95
Replies: 6
Views: 977
I have one but didn't find it helpful on my K-x. If you PM me I'll send it to you for free.
Forum: Photographic Technique 06-16-2013, 06:29 AM  
Advice/material to help with fast lenses?
Posted By JimJohnson
Replies: 17
Views: 2,010
Actually the diopter is even easier to adjust than this.
Take the lens off and turn on the camera. Touch you shutter release to turn on the in-viewfinder LED display. Adjust the diopter until you see the sharpest characters. Done.

Wear multi-focal glasses? Remember this...

When you look at the LCD on the back side of the camera .... no matter how far away your subject might be, you need to focus on the LCD to see it. Use the close viewing part of your glasses.

When you look through the viewfinder ... no matter how far away your subject might be, you are actually looking at the focusing screen inside your camera - and the viewfinder optics are set to make this appear to be at infinity. Use the distance part of your glasses when you look through the viewfinder, NOT the closer focusing portion of your glasses. The diopter adjustment is there to tweak the view to infinity.
Forum: Troubleshooting and Beginner Help 06-10-2013, 05:49 AM  
Sensor cleaning
Posted By GibbyTheMole
Replies: 19
Views: 3,628
Here's what I do... I've done it many times. It's a piece of cake, it's safe, & it works great:

https://www.pentaxforums.com/forums/pentax-dslr-discussion/165819-eureka-fina...an-sensor.html
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