Forgot Password
Pentax Camera Forums Home
 

Showing results 1 to 25 of 300 Search:
Forum: Pentax K-3 III 1 Hour Ago  
FA43 Limited registers as 42mm?
Posted By c.a.m
Replies: 3
Views: 83
The depth of knowledge on this Forum never ceases to amaze. It's truly a wondrous place. ;)

I noticed the '42mm' indication also. Shrugs.

- Craig
Forum: Pentax Film SLR Discussion 2 Hours Ago  
Anyone servicing film camera's in Canada?
Posted By c.a.m
Replies: 3
Views: 91
A while ago, I had bookmarked this guy: Home

He's located near Kingston, Ontario. I haven't used his service, so I can't vouch for the quality.

- Craig
Forum: Pentax K-3 III 3 Hours Ago  
Anyone really measured the UHS-II write speed in the camera?
Posted By c.a.m
Replies: 24
Views: 897
I agree. Sorry, I didn't mean to suggest your analysis was incorrect. 60 or 70 is far from what we would expect with UHS-II.

The specifications for the K-3 Mark III simply indicate that the camera is "UHS-I/UHS-II compatible." As we know, there is no specification for ultimate buffer-clearing times. As you have mentioned, a specification for UHS-II could lead users to believe that it has a faster overall speed for writing data to the card in slot 1. In my case, I decided not to buy a UHS-II card until I really need it. I don't usually shoot long, rapid bursts.



Other cameras:

Sony A9 (2017), 24 MP, UHS-II, RAW 14-bit uncompressed, Cont Hi (RAW) 5 fps, 241 frames, 38 s to clear buffer.

A7R IV, 61 MP, UHS-II x 2, RAW compressed, 74 frames, 26 s to clear buffer.

Canon 90D (2019): 32 MP; Continuous High RAW, 10.0 fps, 27 frames then 3.9 fps; 5.6 seconds to clear after a high burst.


- Craig
Forum: Pentax K-3 III 4 Hours Ago  
Anyone really measured the UHS-II write speed in the camera?
Posted By c.a.m
Replies: 24
Views: 897
I have been following your posts on this subject. Thanks!




From the strip plot for the third case, I see the following:

First burst: 36 frames in 3 seconds, followed by 29 frames in a 14-second period (2,1 fps). Total frames: 65

Buffer clears at 30,5 second mark.

Total data recorded: 65 frames RAW (DNG?) x 33 MB/frame average = 2145 MB. Average data speed to SD card over the recording period: 2145 / 30,5 = 70 MB/s

I am not familiar with the architecture of the image-file recording system. It's possible that during the slower image rate after the first burst, the buffer operates in read/write mode, i.e., writing some of the buffered data to the card. It might be useful to examine a sample run in which the shutter is stopped just at the end of the first high burst, then see how long the buffer takes to clear. I don't recall whether you had tested this scenario already.


FWIW, I looked up some performance times at various reviews done by Imaging Resource.

Sony A7III (ca. 2018): 24 MP, 14-bit uncompressed RAW. UHS-II. Continuous Hi+ (RAW only), 33 frames at 9,9 fps, then slows to 1,21 fps. Time to clear 33 frames after a high-speed burst: 26 s.

Fujifilm X-T3 (ca. 2018): 26 MP, 14-bit RAW lossless compressed, Mechanical shutter, UHS-II, 36 frames at 11 fps, then 2,7 fps. Time to clear 36 frames: 12,3 s

Buffer clearing times were measured with a 64GB Lexar Pro 2000x UHS-II SDXC card.

- Craig
Forum: Pentax K-3 III 5 Hours Ago  
Post your K3 iii pictures.
Posted By c.a.m
Replies: 510
Views: 45,280
It is certainly easy to recognize that it is a bat! Good demonstration of the capability of the camera... and the photographer.



"Quick, Robin, get the BatCam."

"Holy lock-on-focus. Alfred has supplied us with a K-3 Mark III."

- Craig
Forum: Pentax KP 1 Day Ago  
A piece off my KP
Posted By c.a.m
Replies: 9
Views: 286
Assuming that your eyecup has slid off without damage, this video might be helpful. It describes a Hoodman-brand eyecup on another brand of camera, but I think that the principle is similar to the KP eyecup.

The segment at 0:21 shows the arrangement of the slot and guide.

- Craig

















You Tube



Forum: Pentax K-3 III 2 Days Ago  
K-3 III bug in 2s self timer mode - Source of fuzzyness
Posted By c.a.m
Replies: 49
Views: 1,739
Yes, that's the normal default operation. The 'auto SR off' function can be defeated by a menu setting (Camera 7 page).


- Craig
Forum: Pentax K-3 III 2 Days Ago  
K-3 III bug in 2s self timer mode - Source of fuzzyness
Posted By c.a.m
Replies: 49
Views: 1,739
Would you please identify the lens?

Tripod mounted, or hand held?

For images 3 and 4, was SR on or off?

Thanks!

- Craig
Forum: Pentax K-3 III 3 Days Ago  
A few K-3 III questions
Posted By c.a.m
Replies: 22
Views: 817
Thank you. This is a better method than I was using -- only two presses are required.

- Craig
Forum: Pentax K-3 III 3 Days Ago  
K-3 III bug in 2s self timer mode - Source of fuzzyness
Posted By c.a.m
Replies: 49
Views: 1,739
Thanks for posting. In a way, it's good to see this 'real-world' example, which correlates with the various basement-lab tests reported by several users. Someone else had suggested that a user could reasonably be expected to use Horizon Correction and the timer when the camera is not hand-held but placed on a stable platform other than a tripod -- your case precisely.

So, at least you know it was not operator error.


- Craig
Forum: Pentax K-3 III 3 Days Ago  
A few K-3 III questions
Posted By c.a.m
Replies: 22
Views: 817
I'm not sure about all the other brands, but I see what you mean about the Nikon ring (I see examples online). The ring on the K-3 III is not symmetrical, so it's not possible to reposition its plastic clip. Good to know, I guess.


- Craig
Forum: Pentax K-3 III 3 Days Ago  
A few K-3 III questions
Posted By c.a.m
Replies: 22
Views: 817
I would agree. When I first saw the Smart Function segment on the top LCD, I thought the LCD was damaged. Now that I understand the display and the Smart Function settings, I can interpret the abbreviations fairly easily, but I agree -- it's cryptic.

To see the 'shots remaining', it's easy enough to toggle ON the rear display, but it takes 3 presses of the Info button to cycle through the display from off, info, back to off.

- Craig
Forum: Pentax K-3 III 3 Days Ago  
A few K-3 III questions
Posted By c.a.m
Replies: 22
Views: 817
Would it be fair to distinguish between design "failures" and design compromises? Or distinguish "design failures" and potential system failures?



The metal rings on my K-5 II and K-3 II appear to have the same construction as the ones on my K-3 Mark III (without the plastic wrap-around), and I believe this has been a standard design for years on various brands. Like you, I wondered about these D-rings several years ago when I was doing my monthly camera check, but concluded that fraying would be improbable. I don't recall finding any reports of failures in the type of flat strap that I use, and I have not noticed any fraying on the strap, which I've used on all three cameras.

I think I had seen a couple of reports of fraying or breakage in the small-diameter cords that were used in an early version of the Peak Design anchor clip.



I use a custom-made, flexible, 10-mm wide nylon strap to attach to my K-3 Mark III; its other end attaches to a Domke Gripper neck strap. It clears the Mode dial, but just barely. Perhaps another style of strap would cause a problem as you have described.

- Craig
Forum: Pentax K-3 III 3 Days Ago  
K-3 III bug in 2s self timer mode - Source of fuzzyness
Posted By c.a.m
Replies: 49
Views: 1,739
Thanks for posting the link. I have been following that thread at DPReview. I think that it covers the issue well.

In summary, the issue appears when Horizon Correction is ON and the 2-second, 12-second, or IR Remote 3-second timer is used. The issue appears in either viewfinder mode or Live View.

I have reproduced the effect -- camera on tripod, Horizon Correction ON, 2-second timer, DA 20-40mm Limited at 35mm, f/5.6, 1/60 s. The effect is independent of the SR mode; SR can be ON or OFF. I have not tested it while hand-holding the camera, nor at other shutter speeds.

The centre of the image is sharp, while the corners are blurry. The blurriness increases progressively from the centre towards the corners.

- Craig
Forum: Pentax DSLR Discussion 4 Days Ago  
Pentax K3 III Crop Factor
Posted By c.a.m
Replies: 5
Views: 644
Crop factor is defined as the ratio of the diagonals of the reference 135-format film image frame and the comparison sensor.

A 135 film, popularly known as '35 mm film', has an image frame of 24 x 36 mm, and a diagonal of 43.27 mm. (Its physical film strip is 35mm wide.)

The K-3 Mark III sensor has dimensions of 23.3 x 15.5 mm, diagonal 27.98 mm.

Thus, the crop factor of the K-3 III is 43.27 / 27.98 = 1.546.

Typically, APS-C crop factors are rounded to 1.5. It's confusing, though, because various APS-C camera models can have slightly different sensor dimensions.

- Craig
Forum: Troubleshooting and Beginner Help 5 Days Ago  
Is it just me as I had to AF adjust my screw focus Pentax lenses
Posted By c.a.m
Replies: 10
Views: 561
Hi @JRTom, welcome to Pentax Forums.

You have a nice kit there, with your K-3, 21, 40 and 18-135mm.

I think that you've discovered an attribute of DSLRs and their lenses -- in general, "AF Fine Adjustment" may be needed for any lens, whether it's a prime lens, zoom, in-lens motor driven or 'screwdriven'. As you've found, calibrating a lens can improve its focus and image sharpness.

I think that photographs printed from film didn't 'suffer' the same issue, because the print sizes were relatively small compared to the large displays and zoom-in capability we have now.

Most of my dozen lenses require an AF Fine adjustment ranging from -8 to +6. Only one has its best AF performance at AFFA = 0. I have screw-driven and in-lens motor driven lenses.

Incidentally, AF Fine Adjustment doesn't affect the focus in Live View, as a different focus method -- on-sensor contrast detection -- is used.

- Craig
Forum: Pentax K-3 III 06-06-2021, 08:46 AM  
The CameraStore TV reviews K-3 Mark-III
Posted By c.a.m
Replies: 29
Views: 1,372
@LeeRunge, I know that you're positive about the K-3 Mark III and Pentax in general, so no challenge there. Not meaning to poke you with a rebuttal stick; just proposing that there are various ways of assessing potential options. Maybe a prospective buyer will stumble upon this thread! :)

I would agree that a new buyer might assume the relative weaknesses in this list. However, upon deeper research and consideration, that new buyer could conclude:

Lenses. I'm glad to see this one at the top of your list -- lenses are critical in a system. Except for the long zoom at 600 mm, one could conclude that the Pentax line covers a sufficient range from 10 mm to 560 mm, albeit in several different marques. The D FA 150-450 almost reaches that specialty focal length, but not quite. While a fulsome lens lineup -- and extensive third-party options -- may seem preferable upon first glance, an objective buyer should determine their own use cases and needs.

Sheer numbers of lenses is not necessarily a good measure of comparison. I think that the Pentax line could serve every genre of photography except the longest-FL wildlife, and it includes several top-notch models.

Buffer. I believe that the K-3 III has a larger buffer than the D500. Here's what Imaging Resource found when they tested the D500 in 2016 (copied from another post I made).

Nikon D500 Review - Performance

Performance test of Continuous High mode: 14-bit RAW (lossless, compressed) + JPEG (Large, Fine), using a Lexar Pro 2933x 64 GB XQD 2.0 card rated at 400 MB/s write.

The D500 achieved "10.2 frames/sec for 27 frames total then slowed to an average of 3.83 fps with a full buffer. Time to clear 27-shot buffer: 4 seconds." (No indication of the AF mode)

The K-3 III specifications indicate that the RAW+ continuous shooting is rated up to 30 frames at 12 fps [11 fps with AF] but the shooting speed is slower when shooting with a "high ISO sensitivity."

Memory Cards and buffer clearing. Certainly, the D500 has a specification for faster cards. However, at this point I don't think we've seen any detailed tests or measurements that would provide a fair comparison. I hope that Imaging Resource provides this quantitative data for the K-3 III.

AF Points and AF.C Comparison. As you've suggested in other remarks, real-world comparisons of AF performance would be more useful than comparing specifications. The brief DPReview video review seemed to speak positively about both cameras in the 'Weaving Jordan Running Test', but that was hardly a definitive evaluation. At this point, I think that an objective buyer would have to wait for credible comparisons.

Flip Screen. No question, the K-3 Mark III does not suit a buyer who needs -- or strongly desires -- this feature. No Pentax for them. ;)

Rear Monitor Screen. The point about the Pentax's lower resolution is valid. It's difficult to find a spec for the pixel count (vice dots). Imaging Resource states the K-3 III has 540K pixels; the D500 spec indicates 590K. Certainly, the Nikon has more pixels; whether the 9% increase makes a real-world difference is hard to say, but I'd think not. Perhaps there are advantages to the lower-density screen, such as power management.

Overall, I would agree that a prospective new buyer might shy away from Pentax. However, I wonder whether such aversion would be based on an underlying negative tone that the Pentax brand seems to have garnered over the years, or recent comments in a few reviews that it's suited mainly for existing Pentax users, instead of a deeper, objective analysis of the new camera and the Pentax system. Ultimately, I really don't think that a lot of folks would bother to do that research.

- Craig
Forum: Pentax K-3 III 06-05-2021, 07:22 PM  
The CameraStore TV reviews K-3 Mark-III
Posted By c.a.m
Replies: 29
Views: 1,372
Agreed, there are all sorts of different combinations at various price points. I would guess that one could even assemble a low-end full-frame kit at around that budget, with the typical strengths and weaknesses that that format brings.

Incidentally, the D500/Sigma/Tamron kit would sell for nearly CAD $8100 at the moment, so the larger apertures and wider focal-length range come with a price. (I haven't priced out the kits in USD, but they're typically ~30% less in USD than the Canadian prices, which reflects the exchange rate.)

No doubt, there are plenty of options and trade-offs across the various brands. I'd say that the Camera Store's mini-review highlighted some of the key features of the K-3 Mark III, but perhaps failed to convey the essence of the camera -- a remarkable, refined DSLR that is a joy to use (in my opinion, at least).


- Craig
Forum: Mini-Challenges, Games, and Photo Stories 06-05-2021, 12:16 PM  
Show me a Sign! Billboards,sign,bus ads,shop signs go here!
Posted By c.a.m
Replies: 5,990
Views: 514,444
Mill Street, Almonte, Ontario.


Forum: Photographic Industry and Professionals 06-05-2021, 09:53 AM  
Thoughts: the irony of camera industry
Posted By c.a.m
Replies: 101
Views: 3,931
Reminds me of toothpaste that one finds on the drug store's shelves. Much of it is based on the same active ingredients, give or take a few percentages, but brands package their products in various ways to occupy as much shelf space as possible.


- Craig
Forum: Pentax K-3 III 06-05-2021, 08:45 AM  
The CameraStore TV reviews K-3 Mark-III
Posted By c.a.m
Replies: 29
Views: 1,372
I think that The Camera Store's 'hands-on review' is reasonable, albeit not a 'rah-rah, razzle dazzle' type of presentation nor an in-depth look. The reviewer mentions a number of characteristics -- robust SR, AA simulator, astrotracer, decent frame rate, tactile buttons at your fingertips, extensive customization, night vision mode, sharp images. The "quality" optical viewfinder is mentioned several times, and he mentions its "excellent information" and the "pleasing viewfinder experience."

On the other hand, the video capability is probably best for casual use, and the buffer is "limited."

Overall, he says that "you really got to love a DSLR camera" to opt for this one over other choices, which is a fair observation.

What other features set this camera apart from others?

The brief review doesn't compare other brands. For interest, I've looked into the prices of comparable kits based on the K-3 Mark III, a Fujifilm X-T4, and the 15-300mm coverage that I get from my core lenses.

K-3 Mark III + 15,21,35 mm Limiteds; DA 18-135mm; DA* 50-135mm and DA* 300: Current price CAD $7140.
Fuji X-T4 + XF 16/2.8, 23/2, 35/2, 18-135, 50-140, 100-300: CAD $8990.

The Fuji would cost CAD $1850 more than the Pentax set.

I excluded my DA 20-40mm Limited, because Fuji doesn't offer a similar lens. Of course, the price of the Fuji kit is driven by the 100-400 and 50-140. I'll concede that other lens groupings would change the price comparison. For example, including a telephoto macro would compare the Fuji 80/2.8 (CAD $1,600) to the excellent Pentax D FA 100/2.8 WR (CAD $600). Swapping the DA* 300 for a DA 55-300 PLM (CAD $500) would drive the price down, as it would for the Fuji set (replace the 100-400 with their new 70-300 at $1050).

Despite the seemingly relative high price of the K-3 Mark III, an overall kit could be quite a bit less expensive than Fuji APS-C.

- Craig
Forum: Pentax K-3 III 06-02-2021, 03:04 PM  
Sigma 70-200 HSM II Macro Issues withs K3 mkIII
Posted By c.a.m
Replies: 2
Views: 278
Hello,

I own that lens and the K-3 Mark III and K-3 II.

My lens works fine in PDAF mode on both cameras. The autofocus is inconsistent on both cameras in Live View/CDAF mode -- it doesn't work well.

I knew it was a problem on the K-3 II in Live View, but I decided to not send it to the Canadian Sigma repair centre for a firmware update, because I never use this lens in Live View mode. I believe that firmware updates are no longer possible here in Canada for this lens.

For more information on compatibility issues with this lens, please see the first review by Gerbermeister here: Sigma 70-200mm F2.8 EX DG APO Macro HSM II Lens Reviews - Sigma Lenses - Pentax Lens Review Database

My lens has the "8 16" lens code, which makes it compatible with the K-3 II and K-3 Mark III PDAF autofocus.

- Craig
Forum: Pentax K-3 III 06-01-2021, 05:54 PM  
Pentax k3 mark 3 - bad copy of the camera at dpreview - ??
Posted By c.a.m
Replies: 178
Views: 10,018
FWIW, here's an introduction to DPReview's Studio Test Scene, and a glimpse into their approach, dated August 2016.

An introduction to our studio test scene: Digital Photography Review

Of note:

"Cameras are mounted securely on a macro rail on a heavily weighted-down tripod, to minimize external vibrations. Self timer and any available anti-shock modes are also employed to minimize the impact of shutter shock. When possible we shoot tethered using Capture One Pro, for precise focus adjustment."

"Interchangeable lens cameras are shot using prime lenses that offer around 85mm equivalent field-of-view – a decision that stems from our historical use of each brand's 50mm lenses on APS-C, which are generally very sharp and consistent across the frame when stopped down a little. The aim is to remove, as much as possible, the impact of the lens. Our testing has shown the use of dedicated own-brand primes to be more reliable than using multiple copies of third-party lenses."

"Experimental Error
Like all processes there are sources of variation (error), including differences in chart alignment, focus and lens performance over time. While we have done everything possible to minimize the impact of these errors (including using a large, easy-to-align chart, careful manual focusing and selecting copies of lenses that are used only for studio testing), it is impossible to eliminate experimental error altogether.

Our comparison tool makes it possible to identify differences that are within the realms of well-controlled error, so we trust our readers not to read too much into very slight differences in apparent performance."


- Craig
Forum: Pentax K-3 III 06-01-2021, 12:45 PM  
Pentax k3 mark 3 - bad copy of the camera at dpreview - ??
Posted By c.a.m
Replies: 178
Views: 10,018
While we're on the topic of DPReview's article, I found their penultimate statement to be unsubstantiated:

"As we've come to expect from Pentax's latest full-frame camera, the K-1 Mark II, you may also notice some noise reduction from the K-3 Mark III in its Raw files at higher ISO values"

How is it possible to determine that there is active "noise reduction" in the RAW files, when looking only at the individual displayed image chips? Certainly, it's obvious that the noise level increases progressively with sensitivity levels, but it's not possible to conclude that there is 'noise reduction' at play without having intimate knowledge of the sensor's base characteristics. DPReview's statement is out of place in this very brief article.

Furthermore, the noise levels appear to be relatively tame up to a fairly high ISO, which DPReview neglects to highlight.


- Craig
Forum: General Photography 06-01-2021, 12:36 PM  
sad news that might benefit some folks Wolfe's Camera in Topeks is closing
Posted By c.a.m
Replies: 8
Views: 830
Always sad when a long-standing small business leaves the community. Imagine all the people who have entered Wolfe's through the generations, looking for equipment, advice, film, photos, prints, whatever.


One thing the Pandemic has shown me is the great and important role that local businesses play in our communities.

- Craig
Search took 0.02 seconds | Showing results 1 to 25 of 300

 
Forum Jump


All times are GMT -7. The time now is 04:05 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top