[maw]

I wanted to mail directly to the headquarters in Japan and describe the problem, but I could not find an e-mail address anywhere on the Internet.

You may send it to Italy or even Germany. The question is, if you send it to Italy to F.o.w.a which represents various brands, including Pentax.
You should contact us first explaining the problem and claiming the costs, before you may send an email to: info@fowa.it

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Last edited by maw; 04-16-2018 at 01:10 PM.

[awscreo]

Slightly off topic - I went through 3 copies of dfa 15-30, and all of them showed signs of decentering on the same side. I sent the lens to repairs last week (being fixed now). I did notice however that one of the screws on the K-1 mount could not be tightened fully, and it's on the same side that shows issues. So, I sent the camera in to fix that too. If decentering was caused by the loose mount, then it's possible lenses were not to blame. If not, then honestly Pentax QC is total garbage, because going through 3 copies of an expensive pro grade lens and still not getting a good copy sounds like a bad joke.

[unapye]

I checked in this respect my k-1 with a friends dfa* 70-200 lens and three of my other lenses and picture was correct. I informed Ricoh about it.

[pentaxfall]

One question: do you have a filter on the lens? If so, have you tested the lens for softness WITHOUT that filter on it?

(I ask because the pattern of softness looks like a partial prismatic effect that's creating a slight doubling of the image microstructure on one side. If you had a filter that was not perfectly flat and parallel on both surfaces, it could slightly refract a bit of the image on one side and create this kind of softness.)

I did not test outdoor without filter. I already mailed the lens to Service center. When they call me next time, I will ask them to test without filter. If filter is the culprit that is the best thing that could happen

Today I will upload few landscape shots, please go through them. That may help refine your theory.

---------- Post added 04-06-18 at 11:48 PM ----------

Slightly off topic - I went through 3 copies of dfa 15-30, and all of them showed signs of decentering on the same side. I sent the lens to repairs last week (being fixed now). I did notice however that one of the screws on the K-1 mount could not be tightened fully, and it's on the same side that shows issues. So, I sent the camera in to fix that too. If decentering was caused by the loose mount, then it's possible lenses were not to blame. If not, then honestly Pentax QC is total garbage, because going through 3 copies of an expensive pro grade lens and still not getting a good copy sounds like a bad joke.

I have read your thread regarding DFA 15-30 where you spoke about mount issue, so I tested with K3 & K1. Problem showed up with both. I have tested K1 against 5 lenses because I was tuning AF. All of them were Ok except for DAF 70-200.

I think poor QC is industry wide problem. Same factory could be making lens for more than one brand. Just like Foxconn was manufacturing both Xbox and PS3

https://kotaku.com/5661699/turmoil-in-the-land-where-your-consoles-are-made

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Last edited by pentaxfall; 04-06-2018 at 11:49 PM.

[pentaxfall]

Here are landscape samples with problem and were shot at F8.

Full Res images
_K1_2906
_K1_2913
_K1_2933
_K1_2921

[awscreo]

I did not test outdoor without filter. I already mailed the lens to Service center. When they call me next time, I will ask them to test without filter. If filter is the culprit that is the best thing that could happen

Today I will upload few landscape shots, please go through them. That may help refine your theory.

---------- Post added 04-06-18 at 11:48 PM ----------



I have read your thread regarding DFA 15-30 where you spoke about mount issue, so I tested with K3 & K1. Problem showed up with both. I have tested K1 against 5 lenses because I was tuning AF. All of them were Ok except for DAF 70-200.

I think poor QC is industry wide problem. Same factory could be making lens for more than one brand. Just like Foxconn was manufacturing both Xbox and PS3

storybreak stars<\/title><path d="M5.146 9.01l-.19-3.623 3.057 1.985.693-1.197-3.213-1.67 3.213-1.638-.693-1.197-3.056 1.953L5.147 0H3.76l.158 3.623L.893 1.67.2 2.867l3.214 1.638L.2 6.175l.693 1.197 3.025-1.985L3.76 9.01m21.386 0l-.19-3.623 3.057 1.9

Yeah, it's a long shot, just another thing to test Precision ended up sending my lens to Japan, I guess they can't fix decentering :/ Or maybe there was another issue they didn't tell me about. K-1 came back, mount is fixed, I didn't have time to test all my lenses for it yet, so not sure if it affected anything (I've also noticed slight softness on the left side of my DFA 28-105). But (and it might be a placebo effect) AF seems to be snappier and more precise, especially with 28-105. Can't wait to get my 15-30 back and test that as well.

---------- Post added 04-07-18 at 08:40 AM ----------

Here are landscape samples with problem and were shot at F8.

Full Res images
_K1_2906
_K1_2913
_K1_2933
_K1_2921

I believe this shows all signs of being de-centered, I had the same issue with my Tamron 70-200 before, had to send my camera with the lens, so Tamron tuned the lens specifically for my camera. Works like a charm now

[pentaxfall]

Lens is going to the Japan for repairing, according to Precision camera.

[awscreo]

They did the same to my 15-30, it's in Japan right now. I guess Precision cannot fix optics.

[pentaxfall]

Seems Precision needed my nod before sending it to Japan. But Precision never called me. I called them asking for status, then they sought my consent for sending it to Japan.

They did the same to my 15-30, it's in Japan right now. I guess Precision cannot fix optics.

Probably those equipment are expensive, but Tamron is able to do that in US. My guess is that people are not willing to share knowledge. Lack of transparency seems common across the industry.

---------- Post added 04-17-18 at 10:48 AM ----------

They did the same to my 15-30.

What is the turn around time? How many weeks?

[awscreo]

Seems Precision needed my nod before sending it to Japan. But Precision never called me. I called them asking for status, then they sought my consent for sending it to Japan.


Probably those equipment are expensive, but Tamron is able to do that in US. My guess is that people are not willing to share knowledge. Lack of transparency seems common across the industry.

---------- Post added 04-17-18 at 10:48 AM ----------


What is the turn around time? How many weeks?

They told me 3-5 weeks. I'm hoping it's 3, I will need the lens for a shoot in May..

Tamron fixes their own stuff, but considering how many brands Precision services, it's kind of weird they don't have the tools..

[pentaxfall]

Tamron fixes their own stuff, but considering how many brands Precision services, it's kind of weird they don't have the tools..

I think Precision act as Level-1 support for Pentax. When I asked Precision to replace the lens, they said "it is Pentax's decision", as if Pentax is a different company.

[awscreo]

I hope they can send it back to me before the shoot. or I'll have to rent..

I have had the same problem with THREE DFA*70-200 on THREE different K-1 bodies. Nice to finally "meet" more people with the same problem.

The Swedish repair center wants to repair the lenses but are not allowed, they have to send them to Japan. They repair all the Tamron lenses and other Pentax lenses but not the DFA*70-200 for some reason.

Well, my number 2 DFA*70-200 is on it's way to Japan as we speak. Not only for the AF-problems but also due to missing connection between the lens and body sometimes...

They have given me the opportunity to get my money back but I am hesitant because I have a bunch of great images taken with lens nr 2 and body nr 2 before the AF started to suck. A good offer since I have had it for almost 14 months...

[pentaxfall]

Well, my number 2 DFA*70-200 is on it's way to Japan as we speak. Not only for the AF-problems but also due to missing connection between the lens and body sometimes...
.

Shows that lens is not durable. Durability is as important as sharpness. This worries me.

[awscreo]

I have had the same problem with THREE DFA*70-200 on THREE different K-1 bodies. Nice to finally "meet" more people with the same problem.

The Swedish repair center wants to repair the lenses but are not allowed, they have to send them to Japan. They repair all the Tamron lenses and other Pentax lenses but not the DFA*70-200 for some reason.

Well, my number 2 DFA*70-200 is on it's way to Japan as we speak. Not only for the AF-problems but also due to missing connection between the lens and body sometimes...

They have given me the opportunity to get my money back but I am hesitant because I have a bunch of great images taken with lens nr 2 and body nr 2 before the AF started to suck. A good offer since I have had it for almost 14 months...

It's like listening to my story but from another perspective lol. I'm on my third copy of 15-30 that Pentax failed to fix, after a month of waiting I got back the lens with right side decentering instead of the left side. I was starting to wonder if it's my mount, because it's so unbelievably unlucky to run into three duds in a pro line of lenses, but then I look at my images taken with my already sold rokinon 14 2.8 and I see much more even images from a $250 prime also, my mount was repaired and adjusted a month ago, so it should be at factory spec. so far I didn't get a reply from Pentax, and repair company only offers me to send the lens for another round of fix ups that I don't believe to do any good. Plus it's another month of my photo life.

Im going to call Pentax on Monday (hope the phone numbers provided to me in another thread work), see what they can offer.