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02-19-2014, 11:13 AM   #16
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How is it with serial numbers and roms?

02-19-2014, 11:19 AM   #17
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Since this is about lenses.....................
moving

To the Lens Discussion forum.
02-19-2014, 12:04 PM   #18
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QuoteOriginally posted by Parallax Quote
Since this is about lenses.....................
:moving:

To the Lens Discussion forum.
ok, thank you!

QuoteOriginally posted by VisualDarkness Quote
How is it with serial numbers and roms?
serial number isn't in lensrom, only on the lens body


I would appreciate it if some more would send their lensroms

Last edited by Duc-Driver; 02-19-2014 at 12:14 PM.
02-19-2014, 06:53 PM   #19
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QuoteOriginally posted by sterretje Quote
Possibly a stupid question (for a software engineer that grew up in the embedded world) but how do you get the info out of the lens?
QuoteOriginally posted by Duc-Driver Quote
have a look here:
https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/208353-how-...ml#post2203064

i used a K100D and the debug menu to store the lensrom
Indeed, it is possible to get a dump of the running configuration,* but I don't see what it has to do with focus calibration. I would think that would be particularly true for any of the lenses in the database (most) that lack internal focus motors. After all, the data pin for those lenses only transmits focal length information and lens model information.


Steve

* Forgive me if I am mistaken, but the file pulled using the debug mode is not the lens firmware, per se. Rather, it is the set of configuration parameters referenced by the firmware.

02-20-2014, 08:15 AM   #20
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QuoteOriginally posted by stevebrot Quote
After all, the data pin for those lenses only transmits focal length information and lens model information.
Hi Steve, it is more then just focal length and lens model. You can find:
- near distance aberration correction data
- light color aberration correction data
- open aberration data
- and some more

You can fine adjustment your lenses with lensrom. Sigma, Tamron, Pentax do the same. If you have got problemes in focusing they change same data in lensrom and then it will work regardless of whether it's a hsm, sdm oder screw drive.
02-20-2014, 10:05 AM   #21
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QuoteOriginally posted by Duc-Driver Quote
Hi Steve, it is more then just focal length and lens model. You can find:
- near distance aberration correction data
- light color aberration correction data
- open aberration data
- and some more

You can fine adjustment your lenses with lensrom. Sigma, Tamron, Pentax do the same. If you have got problemes in focusing they change same data in lensrom and then it will work regardless of whether it's a hsm, sdm oder screw drive.
If you say so...

I am looking forward to your example photos showing the results of "rom" tuning for any of the FA or F series lenses.


Steve

(...also a software engineer...)
02-20-2014, 10:34 AM   #22
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My DA 35/2.4 rom only says '18' when viewed in-camera.
02-20-2014, 11:06 AM   #23
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QuoteOriginally posted by stevebrot Quote
If you say so...

I am looking forward to your example photos showing the results of "rom" tuning for any of the FA or F series lenses.


Steve

(...also a software engineer...)
ah, i now understand what you mean.
i found out that old lens got same number each row in lensrom, so you can't change anything - there is no "data" in the rom
what you can edit.
But on newer lenses, it should work.

---------- Post added 02-20-14 at 07:07 PM ----------

QuoteOriginally posted by Giklab Quote
My DA 35/2.4 rom only says '18' when viewed in-camera.
what do you mean? can you send me your rom or upload here as a txt?

02-20-2014, 11:25 AM   #24
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QuoteOriginally posted by Giklab Quote
My DA 35/2.4 rom only says '18' when viewed in-camera.
Same behavior with DA*55.
SAme behavior with DAL 35
Same behavior with DAL 18-55.

Different behavior for DA40 and FAJ 18-35.

QuoteOriginally posted by Duc-Driver Quote
what do you mean? can you send me your rom or upload here as a txt?
Just did for DA*55. other sent : DA 40 /DAL 35 /FAJ 18-35 / DAL 18-55

Did you find how to fine tune AF so far ?

---------- Post added 20th Feb 2014 at 07:46 PM ----------

QuoteOriginally posted by Giklab Quote
My DA 35/2.4 rom only says '18' when viewed in-camera.
i discovered something : with the DA40, the Lenseep is full of the same value (2B or 2F) in the one i've send you.
When i do "LENS ROM EDIT R/W" the read value change when i change the focusing distance. the value that appear is the same in the Lenseep. if i create a Lenseep when in infinity, i got only "2B" in it, under 3m mark i got "2D", under the 1m mark i got "2F".
There is some intermediate values too.

Same with FAJ 18-35

Other : With K lens, Lenseep just show "FF" i guess that mean "zero" in terme of data.

Last edited by aurele; 02-20-2014 at 12:02 PM.
02-20-2014, 12:56 PM   #25
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Rom of your DAL 35 / DAL 18-55 / DA*55 are looking "normal" -> you can change your focus if you know what you do (i don't know it yet)

i discovered the same like you with my Tamron 28-75, same value and change if you change focus distance.
And i noticed that i can't chance any value with this lens

Lensroms are in "hex", in "dez" FF means 255
02-20-2014, 01:27 PM   #26
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It shows 18 when using the R/W command in the camera. On the PC, it says other stuff, but I haven't checked out everything yet.
02-20-2014, 02:08 PM   #27
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18 is the first value of the rom, so i think it shows you that
02-23-2014, 02:58 PM   #28
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anybody got a clue where to mode the *.LNS for af finetuning

Hi!

FTF. I have a Sigma 70-200 APO DG Macro HSM II, that is very cool but needs adjustment of the af. i gave it a +10 from camera fw - side, but it would be much cooler if i could adjust the af lens internal.
what modifications do i have to make?

The next problem with this lens is: i dont get any results when i try to af with contrast-af in live-view mode.
i read that some da* sdm lenses also had such problems in the beginning. So my guess is, that this behaviour has to do with the speedy ultrasonic drive motors so the camera has not enough time to recognize when the lens has reached the point of most contrast on the point(area) given.

Can i do anything about this by modding its lensrom? Maybe somebody know a modification for some other sdm lens to reduce the sdm speed with the condition that the camera is in live-view mode.
Otherwise i would have an overall slow autofocusing lens. Plz spare me words about how easy autofocusing is with live view. i know it all but i did not buy such a heavy hight tech lens to af it manual when in live view.

kind regards, Peter!
02-26-2014, 01:19 PM - 1 Like   #29
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edit list of lensroms and sort it: there are a few roms without data in lensrom.

Now you can find some Files to enable debug menu of K3; K30, K5IIs, K5II, K5 in the database
07-03-2014, 01:43 AM   #30
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added

- Pentax SMC DA 60-250mm F4.0 (IF) SDM
- Pentax SMC DA 300 F4 ED [IF] SDM
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