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Forum: Pentax SLR Lens Discussion 12-19-2018, 11:03 AM  
Collection of Lenseep / Lensroms
Posted By Duc-Driver
Replies: 58
Views: 9,592
did you noticed any differences between those lensrom and your 17-50?
So the original lensrom has only backfocus at 35mm and the other ones at 20mm?

Because I don't know exactly if other brands are also working with lensrom as Pentax itself is doing it.

I can upload a excel file where you could find the values you need - I did this once with a 50-135 for testing
Forum: Pentax SLR Lens Discussion 11-10-2018, 03:32 AM  
Collection of Lenseep / Lensroms
Posted By Duc-Driver
Replies: 58
Views: 9,592
I bought a damaged K20D for only 20€ for doing this. This camera crashed on the ground but it's working for lensrom conversation ;-)
Forum: Pentax K-1 10-14-2018, 10:49 AM  
Focussing screens for the K1 DIY split image
Posted By Duc-Driver
Replies: 68
Views: 12,760
the dimensions are not that neccesary, yes - it should fit and be in place but the same thickness over the full frame is more important.

I send you an email with linkt to a step file ;)
Forum: Pentax SLR Lens Discussion 10-14-2018, 10:42 AM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
yes...as I said ;-)
Forum: Pentax SLR Lens Discussion 10-13-2018, 12:05 PM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
*istDS is not working - so I think *istD will not work, too - sorry!
Forum: Pentax SLR Lens Discussion 10-13-2018, 11:53 AM  
Collection of Lenseep / Lensroms
Posted By Duc-Driver
Replies: 58
Views: 9,592
Hello Cheungyu,

sorry for late reply!
The difference is the adjusted focusing - so if you have problems for example with front-focus, you can try a different
lensrom (backup yours first). Maybe you've luck and one is working perfectly with your body.
...that's the way I fixed the autofocus of my 100mm Macro WR.

edit: added new lensrom for HD D-FA 28-105mm.
I had luck and still guaranty for my lens - so I send it to pentax and they adjusted the focus.
Forum: Pentax K-1 10-13-2018, 11:48 AM  
Focussing screens for the K1 DIY split image
Posted By Duc-Driver
Replies: 68
Views: 12,760
thank's a lot @6x7II for your DIY!

With my K-3, I used a screen from focusingscreen.com (K3) and searched for one for the K-1 and found your post.

I ordered a Canon Ec-A (like the microprism more) and cut away the nose. The part which needs more time was adjusting the new
shim that it's correct for focusing - with the original shim (~0,58mm thick), there was a huge front-focus.

So I decided to make a CAD-drawing of the original K-1 shim and then printed some of those with my 3d-printer.
The print quality is not that nice because the shim width is very thin but it holds in place and I found the thickness I need (~0,32mm).
I'm very happing because it's working great and right now the focusing with Samyang 135mm F2 is a lot of easier!

If someone want the cad drawing - feel free to ask...maybe someone has got the possibility for lasercutting or something else :cool:
Forum: Pentax SLR Lens Discussion 06-27-2018, 10:16 AM  
Collection of Lenseep / Lensroms
Posted By Duc-Driver
Replies: 58
Views: 9,592
this Database is still alive, I'm getting lensroms via mail and adding them to the folder so it's getting bigger and bigger.


Fixed a 100mm macro WR with another lensrom - the previous one (original one) made problems at focusing with my K-1, now I'm more than happy with that lens.

Till yesterday, I've got a HD D-FA 28-105mm for my K-1, but I've got some focusing problems (from back-to front-focus through the 28-105mm range). I added my 28-105mm lensrom to the
database, so maybe it helps another pentax user.
But it would be very nice, if someone could send me her/his 28-105mm lensrom, maybe i've luck and the lens will be "fixed" with a new one.

cheers!
Forum: Pentax SLR Lens Discussion 01-05-2018, 12:09 PM  
How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8
Posted By Duc-Driver
Replies: 833
Views: 226,575
You need the lens mention 😉
Forum: Pentax SLR Lens Discussion 01-01-2018, 01:50 AM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
Short answer : K3II (also K3) don't work for converting the lens.
Forum: Pentax SLR Lens Discussion 12-14-2017, 04:28 AM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
yes - but it's clear, that it was not only done by editing the lens from...
there have to be a (small?) hardware modification but I don't want to disassemble my working 60-250 for testing
Forum: Pentax SLR Lens Discussion 12-13-2017, 12:59 PM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
no, I'm sorry - couldn't get screwdrive to work properly instead of sdm
Forum: Pentax SLR Lens Discussion 11-19-2017, 03:41 AM  
How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8
Posted By Duc-Driver
Replies: 833
Views: 226,575
jep - *ist D is not working for that because you cant store/restore lensrom with it
Forum: Pentax SLR Lens Discussion 10-08-2017, 10:40 PM  
How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8
Posted By Duc-Driver
Replies: 833
Views: 226,575
read that HowTo in the dropbox folder.
You have to choose one of the xxx.mod folder and rename it to develop.mod.
On KS2 it'a a bit different - each .mod opens another debug menu.
Forum: Pentax SLR Lens Discussion 09-29-2017, 06:49 AM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
I tried the exact rom without modifying it and also modified mine with the "00" values - but it doesn't matter..same problem as before.

Maybe someone should send his sdm broken 60-250 to russia and analyze what they did :D
Forum: Pentax SLR Lens Discussion 09-29-2017, 06:35 AM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
yes - that's sadly what I mean.
It doesn't matter if it's "00" or "80" - the 50-135 screwdrive does work with "00" too.

And yes - his lens is working over the entire range with screwdrive but same lensrom doesn't work with my 60-250 for entire range --> it must be a (small) hardware hack!
He also tested with isolated sdm contacts and didn't see any errors like I when I isolated the sdm contacts, that speaks again for a hardware hack.
Forum: Pentax SLR Lens Discussion 09-29-2017, 12:49 AM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
a guy from russia send me his 60-250 rom with working screwdrive. It was modified at a russian repair center.
But that lensrom has the same mod like we know with changing "C0" to "80" (ok, at this lens it's changed to "00" but that doesn't matter) - so there have to be a (small) hardware hack.
Small because he have not paid that much for that conversation.

If you isolte the sdm contacts and use a modified lensrom, autofocus is working between 1,1m to 2,5m and 5m to 10m.
That is also the range if you only use a modified lensrom with sdm contacts...in this range screwdrive is working but if you go over it - for example 3m - the lens switches to sdm.

With isolatet contacts and if you go for example to 3m, the body gives some error by blinking display - if you go back to 1,1m all is normal again.
So there is some error while focusing over the range from 1,1m to infinity...something is given a wrong data or something like that to the camera.
I tested that with my K20D and my K3 - on both it's the same.

Maybe you have to disconnect the sdm engine or something like that but you have to dissassemble the lens a bit (and mine is still working so far).
I would to that (test that) with a failed 60-250, but not with my good one.



that would be very nice but Pentax will never do this because then they don't get money for a damaged sdm
Forum: Pentax SLR Lens Discussion 09-26-2017, 02:08 AM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
Yes - I tried a lot but without success.
To convert a 60-250 we need to modify hardware of the lens...but I don't want to disassemble my (sdm working) lens.


@ Weevil, K-01 should work like K5, you find the files in my database
Forum: Pentax SLR Lens Discussion 07-19-2017, 01:41 AM  
Collection of Lenseep / Lensroms
Posted By Duc-Driver
Replies: 58
Views: 9,592
Hello!

It was ok ;)

Till now I didn't have time for that - I know what has to be edited but that is a bit hard to do it manually
Forum: Pentax SLR Lens Discussion 07-03-2017, 12:40 AM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
Hello HarisF1,

I've got a K20D body but till now I don't have got a solution...but I'm on it


Edit: Video: https://www.dropbox.com/s/5bo5o45jj305ev5/VID_20170703_115643.mp4?dl=0
So far..but only working if I focus manually to nearest distance
Forum: Pentax SLR Lens Discussion 06-06-2017, 06:44 AM  
Collection of Lenseep / Lensroms
Posted By Duc-Driver
Replies: 58
Views: 9,592
you can try different lensroms with your lens and chose the best for your body - there will be no problem.
Just save your "original" lensrom if you want to go back.
Forum: Pentax SLR Lens Discussion 06-02-2017, 02:30 AM  
Collection of Lenseep / Lensroms
Posted By Duc-Driver
Replies: 58
Views: 9,592
Hello - yes, that's possible and I know what should be modified...I want to creat an excel file for that.
But I've got not much time right now because of exams.
Forum: Pentax SLR Lens Discussion 05-07-2017, 08:47 AM  
How To: Convert SDM to ScrewDrive + Video
Posted By Duc-Driver
Replies: 196
Views: 31,389
nope - if somebody would like to make a small donation, I can give him/her a link to my paypal donation page.
But until now I don't want to do that public - maybe if I get screwdrive working on the 60-250 ;)
Forum: Pentax SLR Lens Discussion 05-07-2017, 08:43 AM  
How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8
Posted By Duc-Driver
Replies: 833
Views: 226,575
I did that with my 50-135 because it had backfocus.
I've got 4 different lensroms for the 50-135 and tested all of them - and luckily there was one that fitted perfect for my lens and body.

Otherwise the camera do a backup automatically when uploading a rom (my camera did it).
Forum: Pentax SLR Lens Discussion 05-07-2017, 02:27 AM  
How to deactivate SDM and allow for screw drive autofocus with DA* 16-50mm f/2.8
Posted By Duc-Driver
Replies: 833
Views: 226,575
Lensroms are mostly the same (for one type of lens). There're only differences if there was focus adjustment directly by pentax.
So you can try load other lensrom to your lens (if it's the same lens).

Do you have newest firmeware on your K-S2?
The storage-card door was open and you pushed the menu button while turning the camera on?
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