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06-22-2016, 03:04 PM   #1
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Backup of the rom data in a lens

Hello,

I found a strange behavior while I was trying to backup the rom data in a lens.

Before a week I prepared for my k-5iis a sdcard with files 00077681.541 and develop.mod and everything worked fine.

Then I read the eep data (LENS ROM DAT CAMERA=>SD) from two lenses: Tamron 90 macro and Sigma 300 macro.
May be 5 days later I have read the data again and surprise... the data was different! I tried a second time to read and the values were the same as previous attempt (but different than the values from before 5 days). They are not totally different but many values are changed. I have read only these two lenses so there is no mistake.

Have you seen this behavior on any lenses and do you have any idea why the values are changing?


Here are the two versions of the first block of the Sigma backup data:


============= -1- Begin =================================================

"; -----------------------------------------------------------------------------"
"; 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
"; -----------------------------------------------------------------------------"
":0000", "7C","7C","7C","7D","04","04","06","83","41","FA","02","02","02","83","7C","7C"
":0010", "BE","02","02","83","41","FA","02","02","02","02","FA","02","02","02","02","02"
":0020", "83","41","FA","02","02","02","02","83","41","FA","02","02","02","02","02","02"
":0030", "83","41","FA","02","83","41","FA","02","02","02","02","02","02","83","41","02"
":0040", "02","02","06","83","41","FA","02","02","02","02","02","02","02","83","7C","7C"
":0050", "BE","83","41","FA","02","02","02","02","02","02","02","F9","F9","F9","F9","F9"
":0060", "7D","06","83","41","FA","02","02","02","83","41","FA","02","02","02","83","41"
":0070", "FA","02","02","02","02","41","FA","02","02","02","02","02","02","02","83","41"
":0080", "FA","02","FA","02","02","02","02","02","02","02","02","83","41","FA","02","02"
":0090", "83","41","FA","02","02","02","02","02","02","02","02","83","BE","02","02","83"
":00A0", "41","FA","02","02","02","02","02","02","02","7C","7C","7C","01","02","83","41"
":00B0", "FA","02","02","02","02","02","83","7C","7C","7C","7C","BE","83","41","FA","02"
":00C0", "02","02","02","83","41","FA","02","02","02","02","02","02","83","41","FA","02"
":00D0", "83","41","FA","02","02","02","02","02","02","06","83","41","FA","02","06","83"
":00E0", "41","FA","02","02","02","02","02","02","02","83","94","0D","94","F8","94","08"
":00F0", "94","E3","0D","94","FC","94","08","94","0D","94","F8","94","08","94","E3","0D"

============= -1- End =================================================


============= -2- Begin =================================================
"; -----------------------------------------------------------------------------"
"; 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
"; -----------------------------------------------------------------------------"
":0000", "02","02","02","02","02","02","02","02","02","02","02","02","02","FA","02","02"
":0010", "02","02","02","02","02","02","83","41","7D","04","02","02","02","02","02","02"
":0020", "83","41","FA","02","02","02","02","41","F9","F9","7D","04","04","06","83","41"
":0030", "FA","02","02","02","02","7D","04","06","83","41","FA","02","02","02","02","02"
":0040", "02","83","41","FA","02","02","02","02","02","02","02","02","02","02","83","7C"
":0050", "7C","7C","7C","7C","BE","02","02","83","41","7D","0D","02","02","02","02","02"
":0060", "02","83","41","FA","02","02","02","02","83","41","7D","06","83","41","FA","02"
":0070", "02","02","02","02","02","06","83","41","FA","02","02","02","02","02","02","02"
":0080", "02","83","7C","7C","7C","BE","02","02","83","41","7D","06","83","41","FA","02"
":0090", "02","02","83","41","02","02","02","02","02","02","02","02","83","41","FA","02"
":00A0", "02","02","02","02","02","02","02","02","02","83","41","FA","02","02","02","02"
":00B0", "02","02","02","02","02","02","7C","41","FA","02","02","02","02","02","02","02"
":00C0", "02","02","83","40","F9","F9","F9","F9","F9","7D","02","02","83","41","FA","02"
":00D0", "02","02","02","83","41","7D","06","83","41","FA","02","02","02","83","41","FA"
":00E0", "02","02","02","02","02","02","02","02","02","02","02","02","02","83","41","7D"
":00F0", "06","83","41","FA","02","02","02","04","04","04","06","83","41","FA","02","02"

============= -2- End =================================================


I have attached both LENSEEP.LNS files.


Thanks

Attached Files
File Type: txt LENSEEP_sigma300.LNS.txt (13.4 KB, 30 views)
File Type: txt LENSEEP_sigma300_01.LNS.txt (13.4 KB, 38 views)
06-23-2016, 10:44 AM   #2
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I'm not as familiar with the lenses - are both screw drive or are either of them hsm?
06-23-2016, 01:39 PM   #3
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Both are screw drive. These are not newest modern lenses but I think they should contain consistent EEP tables as they are AF lenses.
06-25-2016, 03:25 AM   #4
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Nobody has any idea? Really?

06-25-2016, 07:32 AM   #5
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Honestly I have never backed up the data except to modify for screw drive conversion. I also have zero non Pentax auto focus lenses at this point in time.

I'm not sure what the value of backing up the data would be with a non Pentax lens - since I'm not even sure it is designed to be written back to the lens based on what you are seeing.
07-14-2016, 07:50 AM   #6
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I'm a bit late..

Some Tamron/Sigma and also some Pentax lenses doesn't have a "real" Lensrom.
They "do it" in another way ..not as Pentax normally does.

Those lensroms which you can read out of those lenses are changing if you change the focus or focal length.


There is a thread...started long time ago:
https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/251464-coll...-lensroms.html
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