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Forum: Pentax KP 4 Days Ago  
Sigma 24mm 1.8 EX DG compatibility Pentax K-P
Posted By jatrax
Replies: 5
Views: 331
We would need to know for what mount the lens was made for. If it is K-mount then it should work though you may have to change a setting on the lens. If it was made for another brand's mount such as Canon or Nikon then there are sometimes adapters that will work with various degrees of functionality. But without knowing what mount the lens is for it is difficult to give good advise.
Forum: Pentax SLR Lens Discussion 4 Days Ago  
SMC DA* 16-50 vs HD DA 16-85
Posted By jatrax
Replies: 24
Views: 1,155
Unless you need f/2.8 get the 16-85. I used the DA*16-50 for years on various cameras. Bought the 16-85 to try and after evaluation sold the 16-50. Obviously the 16-50 'wins' at f/2.8 and at some focal lengths it might be better optically. But not enough better to overcome the other limitations.

The only downside to the 16-85 is the slower and variable aperture. Which really is not an issue for general photography especially if it is backed up by prime lenses for special shots.
Forum: Troubleshooting and Beginner Help 03-08-2020, 08:28 PM  
Colored lines on LCD on Kx - Ever seen this?
Posted By jatrax
Replies: 10
Views: 549
So what happens if you put in fresh batteries?
Forum: Pentax K-30 & K-50 03-02-2020, 01:50 PM  
K-50 with 28-80mm macro lens
Posted By jatrax
Replies: 19
Views: 639
We would need to know the exact name and model of the 28-80 lens. There are likely 30 or so different ones that fit Pentax. Some will be auto focus some will be auto aperture and some all manual.
Forum: Pentax SLR Lens Discussion 02-26-2020, 10:32 AM  
HD-or Aerobright coated FA Limited Primes
Posted By jatrax
Replies: 85
Views: 2,697
I suspect the key here is whether there has been another production run or are they still using old stock?

Once current stock runs out Ricoh will need to make a decision:
1) Discontinue the FA Limiteds
2) Re-issue as HD-FA with new coatings
3) Redesign a new line of DFA Limiteds

No way to know how they will decide but with the current camera market I do not have a lot of confidence in seeing anything except #1.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 02-26-2020, 10:26 AM  
Going into Micro Four Thirds - I'm getting an Olympus OM-D E-M1 Mark III
Posted By jatrax
Replies: 120
Views: 4,416
I think there is too much focus on 'gear' and not enough on images. Any modern gear from any of the manufacturers will produce images far beyond my abilities. So the decision on what to carry should really come done to what feels good and works best for any particular person. If you think that Micro 4/3 is what works best for you why be sad? Focus on the images not the gear.
Forum: Pentax News and Rumors 02-20-2020, 06:55 PM  
New information about new flagship's selling date
Posted By jatrax
Replies: 1,650
Views: 112,232
I am confident all or at least most of us would appreciate some information from Ricoh. But Ricoh ≠ (Canon/Nikon/Sony/Fuji) . Ricoh is predominantly a business to business company and does not do marketing well (or at all). I think a small group of social media savvy folks could (with little budget) make a significant impact in elevating the Pentax brand. But that is not going to happen because Ricoh's management style does not work that way.

Canon/Nikon/Sony = Brag constantly about new model to keep the hamster wheel spinning even if the new model is not much different than the old model.
Ricoh = Once we have something in stock at retailers we might mention it. Or not.

I doubt anyone is going to argue with your opinion of how this should work, but nothing is going to change Ricoh's opinion of how they do marketing and customer information. So it is what it is and we will get a new camera/lens/flash/whatever when and if they ever get around to it.
Forum: Pentax SLR Lens Discussion 02-16-2020, 08:45 AM  
Pentax 24-70 f2.8 - slow AF?
Posted By jatrax
Replies: 13
Views: 880
Odd. My impression is quite different. I was impressed with the focus speed of the DFA 24-70 especially compared to the DA*16-50. But all things are subjective.


I've not tested precisely but I would agree the DFA 28-105 seems somewhat faster.
Forum: Pentax SLR Lens Discussion 02-15-2020, 08:43 PM  
Pentax 24-70 f2.8 - slow AF?
Posted By jatrax
Replies: 13
Views: 880
Everything is subjective but I've not found the 24-70 to be slow compared to other Pentax lens. On the contrary it is much faster than (for example) the DA 60-250, DA 300, DA 16-50.
Forum: Pentax SLR Lens Discussion 02-15-2020, 08:09 PM  
DA* 60-250 on FF
Posted By jatrax
Replies: 19
Views: 953
Yes the modification is necessary for use on FF. Unless you intend to crop every image the vignette is unacceptable with the baffle installed. Either remove the baffle or replace it with one designed for FF. Several people have been 3D printing them, that's what I used. Even with the baffle changed you will see a significant vignette but mild enough that it can be fixed in post or ignored. But IMHO the lens is not usable on FF unless modified. YMMV
Forum: Flashes, Lighting, and Studio 02-05-2020, 11:48 AM  
Flying with flashes
Posted By jatrax
Replies: 10
Views: 562
Should be no issues with the flashes themselves. Might be an inquiry on the batteries. There was a lot of concern about batteries last year, not so much in the news anymore though. I pull the batteries and put them in plastic cases separate from the flashes. Never had an issue.
Forum: Troubleshooting and Beginner Help 01-03-2020, 07:03 PM  
Is it possible for a lens's internal dust to appear in an image?
Posted By jatrax
Replies: 43
Views: 1,757
I choked on my tea reading this. I don't know maybe it is OK to use a microfiber cloth. But I most definitely would not. They make special soft cleaning stick for cleaning the sensor. Search on "sensor wet clean".

Just a suggestion but I think you would get a better idea of what dust is still on your sensor if you shot something completely blank, such as a white piece of paper or a clear blue sky. With the shots you are taking you see some but probably not all of the dust because of the texture.

It is possible that the flocking on the inside of the lens is decaying enough to be falling out. I've never personally seen that but it seems the most logical explanation if you are getting stuff out of that lens.
Forum: Troubleshooting and Beginner Help 01-03-2020, 06:55 PM  
A question (or two) about crop factor and field of view.
Posted By jatrax
Replies: 16
Views: 909
Best advice on this subject I have ever read. Really, just forget you ever heard the term "crop sensor", put the lens on and enjoy. Trying to make any adjustments or corrections is just overthinking it.
Forum: Troubleshooting and Beginner Help 01-03-2020, 10:26 AM  
Lens, Camera, or Neither
Posted By jatrax
Replies: 32
Views: 1,740
I would suggest setting up on a tripod precisely square to a plain boring but well lit brick wall. Then you can really see what is happening. Landscape shots are nice but there are too many variables to really diagnose the issue.

As others have suggested it might be a decentered lens. But then again maybe not.
Forum: Troubleshooting and Beginner Help 01-03-2020, 06:07 AM  
Is it possible for a lens's internal dust to appear in an image?
Posted By jatrax
Replies: 43
Views: 1,757
When you made your test with a different lens what aperture were you using? The visibility of dust can be dramatically different at different apertures. Test both lenses again using a neutral wall or better a clear blue sky at f/16 and see what happens.

It has been my experience, though I am certainly not an expert, that dust in a lens will not be visible on an image unless it is huge and easily visible to the naked eye. Dust can affect the image by causing scattering of the light, but you won't see actual spots unless they are on the sensor. I have quite a collection of vintage Takumars and Pentax-F lenses and all of them have some internal dust. And the dust does not show in images.
Forum: Troubleshooting and Beginner Help 01-02-2020, 01:04 PM  
Pentax K5ii Auto focus broken?
Posted By jatrax
Replies: 3
Views: 409
1) Check that the AF / MF switch is in AF. Move it to MF and back a couple times to be sure. That switch can look like it is AF but be in MF sometimes.

2) Check that the lens does not have an AF/MF switch. I am not familiar with that lens so I don't know if that function is present on that lens or not.

3) Clean the contacts on both the camera and lens. it is shocking how many issues I have seen posted over the years that were solved by a simple cleaning with a soft cloth.

4) If you have another AF lens try that to determine if the issue is lens based or camera based.

---------- Post added 01-02-20 at 12:08 PM ----------



To be honest not an issue that has been reported often if ever to my knowledge. With the exception of the AF/MF switch being in the wrong position.

Try the above first before worrying about repairs. Precision had a rough time getting started with Pentax repairs but seem to be reliable these days. If the camera does need repair though the question will be whether it is economic to do so. Check the Precision website for their base cost. It might be cheaper to buy a used K-5ii body than pay for repair.
Forum: Troubleshooting and Beginner Help 01-01-2020, 05:30 PM  
K-7 Problem With inputting focal length.
Posted By jatrax
Replies: 21
Views: 882
If the camera is asking for a focal length on an FA lens then either:
1) The lens has the aperture ring in something other than the 'A' position
2) The lens contacts need cleaned.

Suggest you check the aperture ring and make sure it is in the 'A' position first. If it is then try cleaning the contacts.

I do not believe there is a 320mm selection in the camera for focal length, but unless you are shooting with the lens in manual you should not have to set it anyway, the camera will read it from the lens.
Forum: Troubleshooting and Beginner Help 12-31-2019, 10:47 AM  
Focus concerns with a K7 and a K5 II
Posted By jatrax
Replies: 14
Views: 502
Yep, that's it exactly. My point was only that all three lenses have the same system. SDM if the body supports it, screwdrive if not. The 60-250 is not any different than the other two so why they would call one a 'hybrid' and not the others is puzzling.


I used the 16-50 and 60-250 for about 5 years. The 16-50 was my work horse on a good number of different bodies from k-x through K-3II. It was converted to screwdrive when the SDM failed and performed (IMHO) slightly faster as screwdrive. The 60-250 was perhaps my favorite lens on APS-C and after modification was also used on the K-1. If I were setting up an APS-C kit at this point I would buy the DA 16-85 and the DA*60-250. I do not think the 16-50 is worth the extra money unless you need an f/2.8 lens.
Forum: Pentax Camera and Field Accessories 12-31-2019, 10:36 AM  
Do fast SD cards transfer faster than usb 2?
Posted By jatrax
Replies: 15
Views: 862
Theoretical speed is 60MBps for USB 2.0 and 640 MBps for USB 3.0.

My better SD cards say they will read at 95 MBps.


So (theoretically) yes a fast SD card like Sandisk Extreme Pro will perform better on a USB 3.0 reader. In practice I have used both and while I have not done any real testing there is a noticeable difference in load time using USB 3.0. However, I'm not sure it is worth going out and buying a new card reader or computer to do it. Certainly if I was buying a new reader or computer I would insist on USB 3.0 (and USB 3.1) ports.

Because those read rates are theoretical other factors may have an impact. If your computer or your storage drive is slow and cannot keep up then no matter how fast the card reader is you will not go any faster. The slowest part of the chain will be the bottleneck in your load speeds. Card speed, reader speed, bus speed, drive speed, whichever is slowest is the limiting factor.
Forum: Troubleshooting and Beginner Help 12-31-2019, 07:35 AM  
Focus concerns with a K7 and a K5 II
Posted By jatrax
Replies: 14
Views: 502
The early SDM system was not particularly fast even for its day. That said, it is also possible the lenses were starting to have motor failure. The optical quality of that series: 16-50, 50-135 and 60-250 was quite good as well as the build quality but they are not fast focusing. There is a process for converting those lenses to screwdrive which improves the speed somewhat but at the expense of the screwdrive noise.

I don't believe this is correct. The drive system in all three lenses is identical. The 16-50 and 50-135 can be converted to use screwdrive instead of the SDM but as far as I know the 60-250 cannot. All of these lenses include both screwdrive and the SDM motors, that was for backward compatibility on bodies that could not control the SDM motors. But as far as I know it is one system or the other, there is no such thing as "hybrid" system in the sense that both could be used at the same time.


The new DFA 24-70 should be as fast as most screwdrive lens. But I wonder if your body needs a firmware update to be able to best control that much newer lens.

If I were looking for a new lens for a K-7 or K-5 series camera I would try either the 16-85 or the 18-135. Both are faster than any of the SDM lenses and designed for the APS-C format of those bodies.
Forum: Troubleshooting and Beginner Help 12-29-2019, 08:59 PM  
SD card slots - do you use RAW and JPG or only RAW?
Posted By jatrax
Replies: 43
Views: 1,591
I only use RAW. Everything goes into Lightroom so if I need a jpg its quite easy to get it in whatever resolution you want. I've never seen any reason to use camera jpgs with my work flow.
Forum: Pentax SLR Lens Discussion 12-29-2019, 03:47 PM  
FF lens with limited budget - of legacy
Posted By jatrax
Replies: 19
Views: 956
Never having used the Tokina it is hard for me to make such a judgement. If you like the results then your decision is made.

I'll just repeat myself: Unless you really need f/2.8 then get the DFA 28-105.
Forum: Pentax SLR Lens Discussion 12-28-2019, 10:45 AM  
FF lens with limited budget - of legacy
Posted By jatrax
Replies: 19
Views: 956
When it first came out a lot of people had the same thought. But that is, in my opinion, just a hold over from very old days when the "kit" lens was a cheap one sold as a starter to go with a new camera. It is definitely not true with the DFA 28-105. I bought the DFA 24-70 with my K-1 after a lot of thinking between it and the DFA 28-105. But after some time decided to try the DFA 28-105 also because of all the positive comments. Since then the DFA 28-105 is my most used lens. I use the 24-70 only when f/2.8 is desired and because I have some filters that fit the 24-70 when I want to do long exposure landscape. Image quality (within the same settings) is very comparable. I honestly do not see a difference.

So stop thinking of DFA 28-105 as a "kit" lens and think of it as the slightly slower but longer companion to the DFA 24-70.

Another thought is that almost any modern zoom (kit lens or not) will provide a superior image to any film era zoom except perhaps the very best premium ones like Pentax FA 28-70 f/2.8 and even that is questionable. Lens design has changed a lot in 20 years. And modern lenses are designed for digital cameras instead of film. It makes a difference. Almost any modern zoom like the DFA 28-105 will provide images of comparable quality to the better film prime lenses. In most cases not better, but very close.

If it is possible in your location to rent or to try the DFA 28-105 at a shop I suggest that is the best way to decide for yourself. Everyone has their own standard and things they are particular about so it is always best to see for yourself.

Also, I have some extensive experience with film era zooms, so I can see the difference. This is my Pentax F collection but only the primes get much use these days and then only in special circumstances:

Forum: Pentax SLR Lens Discussion 12-27-2019, 06:03 PM  
FF lens with limited budget - of legacy
Posted By jatrax
Replies: 19
Views: 956
The advantage of the f/2.8 will be there but that is in light gathering and subject isolation and not in any improved optical ability. Traditionally an f/2.8 lens (at least from OEM makers) would be a premium lens. But that is not always the case with third party makers. And you are comparing an older film era lens with a modern one designed from the ground up for a high resolution camera sensor.


So unless for some reason you really, really need f/2.8 just get the DFA 28-105. IMHO it will be a better lens than any film era zoom, except for not having f/2.8. And if you need that wide an aperture you have your prime lenses. And if you are using a K-1 then it is no problem shooting at ISO 800. Many people use 3200 with no issues but I stay under 800.

Seriously, unless you cannot fit it in your budget get the DFA 28-105. Do not even consider film era zooms unless that is all your budget can support.
Forum: Pentax DSLR Discussion 12-27-2019, 05:35 PM  
Could an Amateur sell pictures?
Posted By jatrax
Replies: 20
Views: 1,243
Remember with Alamy I get maybe 20 to 30 sales per year with 12,000 images available for sale. I think they are a good agency to work with but don't expect quick results.
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