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Forum: Troubleshooting and Beginner Help 08-29-2020, 04:36 PM  
Why can't my KP photograph a rainbow?
Posted By zvon
Replies: 29
Views: 2,090
i would start with removing UV filter. I suppose you're shooting raw and adjust in post everything. plus i think that your focus is off. But than again I think that iOS has machine learned AI that enhances certain details that it recognises so it produces a flawless rainbow in your case.
Forum: Pentax SLR Lens Discussion 08-19-2020, 01:40 PM  
Super Takumar 50mm f/1.4 Lens M42 Questions
Posted By zvon
Replies: 34
Views: 1,565
You can not convert CPM to Sieverts just like that from thin air.... CPM is just counts per minute (conversion to Sv depends on calibration by the known source and radiological equipment used). Question for getting Sievert reading is the energy of the particles in eV that are being emitted by the source. It is true that Thorium-232 used in lens is exclusively alpha source but in the decay chain of thorium-232 you also get Radium down the line, which is beta minus and gamma source. And that by it self means absolutely nothing since everybody is bombarded by gamma every second of their lives.... You have to know the energy of those gamma and beta particles to know if any damage to tissue would be present. and in the case of radium generated in the decay chain of Th is negligible.

It's like headphones, you can get them to generate 120+ dB of sound pressure but range/energy is very low. 7 element taks are capable of generating milisieverts when very very close. But even then it is very localized exposure. You would have to wear the rear element right by your eye for 8 hours a day for 10 years to be able to say that it did something to you like like for eg. cataract (shooting blanks on cataracts...)
Forum: Pentax SLR Lens Discussion 08-18-2020, 02:08 PM  
Super Takumar 50mm f/1.4 Lens M42 Questions
Posted By zvon
Replies: 34
Views: 1,565
1 micro sievert per hour is not radioactive. That is equivalent to eating 10 bananas in an hour. People are really trying hard to make some sort of a scandal with thorium lens with these types of videos showing all sort of things that are questionable.


I have both 7 and 8 element and 8 element is better in my opinion. I don't like the look of 7 element when wide open.
Forum: Troubleshooting and Beginner Help 07-12-2020, 01:06 PM  
K3-II producing purple images
Posted By zvon
Replies: 17
Views: 1,124
Have you tried pixel mapping? just for the sake of it...

I haven't seen anything like it and I don't have a good feeling about that.
Forum: Troubleshooting and Beginner Help 06-21-2020, 01:49 PM  
Can you help ID this cable?
Posted By zvon
Replies: 5
Views: 652
Sony ericsson FastPort, variant of Nokia's pop port but longer "prongs"
Forum: Troubleshooting and Beginner Help 06-19-2020, 02:30 PM  
Element oranging
Posted By zvon
Replies: 6
Views: 658
It's due to slight radioactivity of rear thorium element which over time turns the cement yellow. Easily removable with UV either from sun (slower) or UV lamp (faster).

Or find an 8 element super takumar which doesn't have thorium oxide element.
Forum: Pentax K-70 06-03-2020, 03:03 PM  
Latest firmware
Posted By zvon
Replies: 4
Views: 775
Root folder is the first folder that opens on an empty card or any other disk.

When you take a picture your camera creates a single DCIM folder which has pictures in it. And that DCIM folder is in the root folder of the card.
So all you need to do is copy and paste the .bin firmware file to empty card.
Forum: Repairs and Warranty Service 05-25-2020, 03:15 AM  
Takumar 200mm F3.5 repair
Posted By zvon
Replies: 14
Views: 1,511
tnx. I just bought it on ebay last week from a guy in Germany. I was looking on takumarguide website and it seems that mine is in a middle of production (paralell DOF guide). Only thing I think is weird is the serial number. Mine is 1195660 and the author of the site stated that this batch is ending at 1195630. I would really like to know a little bit of history of my particular copy.

1 : 3.5 f=200 (338) - Takumar Field Guide
Forum: Repairs and Warranty Service 05-24-2020, 11:41 AM  
Takumar 200mm F3.5 repair
Posted By zvon
Replies: 14
Views: 1,511
Here are the pictures. It's very easy.


As I said. the front 3 lenses are housed in one single housing that is easily unscrewed by hand.


1. Hold the lens firmly with your left hand at the bottom (near the mount) and with your right hand start unscrewing the front part of the lens which has a red dot for aperture indication. It's a fine thread and it takes a while to unscrew it.
2. After you unscrew the whole front 3 lens assembly, unscrew it even further and you'll get the rear part of the assembly which you can clean easily.
3. Front part consists of two lenses, one front one which is held by the front ring with name and serial number and inner lens which is held by its own retaining ring.


You have to remove either one of those to get access to both lens for cleaning, or just remove everything if you want to clean it carefully.
I used calipers for the rings because I don't have a spanner.

The fourth lens is the lens near the mount. I couldn't get to that lens because I have a same problem as you do. I was unable to unscrew the rear retaining ring. But if you open the aperture, you could in theory take a long Q tip and clean that rear lens with alcohol.







Unscrew the front assembly



Front assembly which consists of 3 lens


Unscrew it even further and you'll get one part with only one lens on the left and part with two lens on the right


The middle lens is held by its own retaining ring. If you remove that lens you'll get access to front lens as well.


Rear lens is theoretically accessible for cleaning from the inside just make sure not to close aperture accidentally, keep it wide open.





Sorry for bad photos I'm on my way out. But I think you'll manage it's not complicated.


P.S.

Those 3 lens in front assembly were not tightened down properly with their retaining rings in my case which caused inability to focus to infinity and very soft images. Who knows, maybe over time they got loose or something.
Forum: Repairs and Warranty Service 05-22-2020, 06:24 AM  
Takumar 200mm F3.5 repair
Posted By zvon
Replies: 14
Views: 1,511
My copy also wouldn't focus to infinity. But the problem was that the 3 lenses in the front element weren't tightened properly. Front element is easily unscrewed and than that whole piece is able to be unscrewed yet again. I don't have a spanner but I managed to tighten the lens rings with measuring calipers. Not only did it start to focus to infinity but the lens is now tack sharp. It was very smudgy and soft earlier.
Forum: Pentax SLR Lens Discussion 05-16-2020, 07:22 AM  
Got my hands on Super Takumar 8 element
Posted By zvon
Replies: 10
Views: 675
Here are test samples for sharpness between 8 and 7 element. first batch with flowers and lenses and terminator was aroud 80-90cm away from both k1ii and xt3. Only thing i "edited" in C1 was that i disabled the noise reduction and on xt3 (velvia vivid preset with -10 saturation). WB is not important here but on k1ii was set to warmer and fuji generally likes colder WB but that is not important right now. You can see the difference between 8 and 7 colors since my 7 element is a bit yellowed and therefore has slower shutter speeds (I didn't clear it all the way with UV).

I shot three scenes with each lens and each camera. First was backlight, second was frontlit and third was just infinity samples. Backlit and frontlit scenes have 4 different focus points. It is overcast rn.
If somebody wants to I can upload whole 15gb of raw files from both cameras. (234 images per camera)
k1ii iso is set to 100 and xt3 is 160 but that is not important for this "test"


I don't have time to write this whole post with manual descriptions for every combination so here is onedrive link with all combinations:
Microsoft OneDrive - Access files anywhere. Create docs with free Office Online.

Backlit scene

8 element f1.4 K1-II (focus on flower)


7 element f1.4 K1-II (focus on flower)



8 element f2 K1-II (focus on flower)


7 element f2 K1-II (focus on flower)



Frontilit scene

8 element f1.4 K1-II (focus on flower)


7 element f1.4 K1-II (focus on flower)



8element f2 K1-II (focus on flower)



7 element f2 K1-II (focus on flower)
Forum: Pentax SLR Lens Discussion 05-15-2020, 04:09 PM  
Got my hands on Super Takumar 8 element
Posted By zvon
Replies: 10
Views: 675
I really love 7 element and the copy I own is really in mint condition (at least mechanicaly) and joy to use, but now I realize that saying 8 element is better than 7 is not just because 8 is rarer and more "special" than 7 it really is better optically. 7 is not 100% usable wide open. It's ok but 8 is just better. Both are soft, but 7 is softer and not in a better way. I'll post my generic test photos tomorrow from X-T3 and K1-II



P.S.

I managed to open and clean out majority of the lens, it was very gritty and just plain dirty inside the casing. It was neglected storagewise.
Forum: Pentax SLR Lens Discussion 05-15-2020, 05:28 AM  
Got my hands on Super Takumar 8 element
Posted By zvon
Replies: 10
Views: 675
I managed to be M42 free for some time, but it came back :lol::lol:
Forum: Pentax SLR Lens Discussion 05-15-2020, 05:21 AM  
Got my hands on Super Takumar 8 element
Posted By zvon
Replies: 10
Views: 675
I rarely post on forum but I'm just happy.


I finally managed to acquire 8 element Super Takumar 50mm 1.4
Not that I was actively looking for one but I was just bored and started looking for M42 lenses. I paid $85 for this 8 element version, found on a local listing in my country coupled with Spotmatic (I didn't buy one) and a person who was selling it was selling her fathers old camera that was just laying around. And her father bought it from his best friend who was a photographer and died.

It had a bit of mold inside but luckily it was on the front of the front glass, on the rear of the rear glass and in between 3rd and 4th group and no oil on aperture blades. Nevertheless I plan on disassembling it a bit more since it has a bit of old cigarette smoke smell to it and to clean the rings. It could be in better shape but I'm happy nevertheless.

















About 5yrs ago I bought a 7 element one in near mint condition just because I wanted to own thorium lens.

P.S.

I bought Takumar 200 f3.5 on ebay and waiting for it to come. (also bought while bored xD)
Forum: Pentax Camera and Field Accessories 02-02-2020, 08:27 AM  
Protector Filter vs UV Filter
Posted By zvon
Replies: 79
Views: 3,100
Isn't it that the UV filter stuck around from film era as a protector on digital? If i'm not mistaken UV filter on film had a specific role in situations where there would be high UV exposure in the scene, as in high mountain tops and what not, which would turn the picture very blue (again depends on type of film you use). And digital cameras are not so sensitive to UV as opposed to IR and that's why you have IR cutoff filter on the sensor itself.

I stopped using both UV and protector filters because I didn't see the point. I use a lens hood for that added banging around protection. And if I get a stone flying in my lens from shooting something like dirt rally, well, that's just bad luck.
Forum: Pentax K-1 03-11-2019, 11:51 AM  
What software works best with K1ii hdr files?
Posted By zvon
Replies: 17
Views: 1,916
My current workflow is like this.

1. Capture hdr raw photo in camera
2. Separate hdr raw files with digital camera utility
3. Photomerge them back in Lightroom using SHIFT+CONTROL+H (that way you skip the lightroom photomerge wizard) but only for tripod and static shots.

If you ask me why don't I bracket:
1. I can see if there are any blown highlights in single image right away in preview

2. Single file is created with one name.
3. After creating photomerged image in LR i just delete separated images.


after separating I just get the numbered prefix and still keep the main image name.
Forum: Pentax K-3 01-03-2019, 04:26 AM  
Possible repair?
Posted By zvon
Replies: 9
Views: 2,097
Just an update.

Price of repair was €250 which is exactly half the price of the new lens. I tried to ask what parts were replaced, to se if the price was justified but I was stonewalled immediately. I would say that the actual repair was less but the store charged what ever they wanted.

At least I managed not to pay from my pocket as I some people owed me money for work :D

The good thing is that I have a warranty again for two more years.
Forum: Pentax K-3 10-29-2018, 04:42 PM  
Possible repair?
Posted By zvon
Replies: 9
Views: 2,097
I tried to put the lens together. And here is what I found out.

1. Flex cable that connects power terminals for motor has been ripped out toghether with connector. (cleanly and could be resoldered)

2. Flex cable that connects pins to the board is partly cut.


Other than that :) , the screws hold together ok, but I wouldn't trust them, they can be tightened pretty hard but the plastic thread is compromised for sure.

Lens does work and has a clean normal image but I can't control aperture and AF is non functioning because motor is not connected to the camera.


If the repair is going to be too expensive, i'll just buy a new one, and try to repair this one myself (not impossible).
Forum: Pentax K-3 10-29-2018, 01:02 PM  
Possible repair?
Posted By zvon
Replies: 9
Views: 2,097
I understand.

Let me rephrase the question. Would this be any cheaper? There is no broken glass, mechanism works the same as before, only thing really broken (on first sight) are the screw holes. I understand that right now I don't know the real extent of the damage but hypothetically, if it were just that, could that repair be on the cheaper side?
Forum: Pentax K-3 10-29-2018, 12:49 PM  
Possible repair?
Posted By zvon
Replies: 9
Views: 2,097
Less than hour ago I had a stupidity moment where I disconnected my K3II from a tripod without holding it with other hand. It just happened I was in a stupid hurry to do I don't know what. Fortunately the shooting and job was done. Camera fell lens first but at an angle. The lens snapped right at the mount yanking the screws from the rest of the lens. Camera works fine, no new noises, no weird behaviours etc. But before I wait for tomorrow and call the Sigma service center, what do you guys think, is this repairable?
Forum: Troubleshooting and Beginner Help 11-11-2017, 03:24 AM  
What GPS software to use with a k3 II
Posted By zvon
Replies: 3
Views: 802
Plus, if you're using GPS log function than you can import that file to Google Earth or any other .kml reader and see where you were going, walking, hiking.... Something like oversized sports watch.
Forum: Troubleshooting and Beginner Help 11-09-2017, 02:12 AM  
Pentax K3ii SD card slot problem
Posted By zvon
Replies: 15
Views: 1,834
I had similar problem on my K-3II with slot 2. When it was brand new. Camera wouldn't operate when slot was empty. It was reporting a memory card error and couldn't be used. I took it to my official Pentax repair center and a guy working there was really detailed and after almost 10 minutes of poking and proding around the slot he found a small piece of plastic like paper. And by small I mean less than 1mm in size. Weird thing is that that debris looked like some sort of leftover from production or something. Hope this helps.

https://www.pentaxforums.com/forums/172-pentax-k-3/303485-k-3-ii-memory-card-glitch.html#post3366103

Forum: Pentax K-3 03-26-2017, 09:18 AM  
K3II Mirror Flap
Posted By zvon
Replies: 15
Views: 2,783
it happened to me once, or twice. But I remember it the first time. It was when camera was 2 months in use (first firmware installed). I had sigma 17-50 mounted. Original full charge battery. And it lasted exactly how you described it. I just ignored it and continued on with the session. I do not know what to think of it.
Forum: Pentax Q 01-10-2017, 06:08 AM  
Instant review very blurry
Posted By zvon
Replies: 2
Views: 916
No, but I found it. I had the camera set to LO burst shooting. So I guess that to speed up the camera the instant review is downsampled.
Forum: Pentax Q 01-10-2017, 01:31 AM  
Instant review very blurry
Posted By zvon
Replies: 2
Views: 916
I have a weird problem with my Q-s1. I bought it used as a presentation and test model at my pentax dealer. But it was near mint. I had no problem until last two weeks. When I take a photo, instant review is absolutely blurred as if focus was set to macro or something. But when reviewing that image later on camera or on computer everything is ok. It is no big deal but it is annoying.
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