i'm an idiot, need an original lenseep.lns for 16-50

Sandy Hancock · 11-30-2014, 01:40 AM

All's well that ends well.
Back. Up.

wibbly · 11-30-2014, 02:19 AM

Ha! Yeah you've got that right. I really just misinterpreted the role of the eeprom data. I thought it was a list of instructions that the body would present and the lens would recognize. Ie the body would suggest to the lens that it was in focus, not vice versa. But yes, lesson learned.

The tolerances must be VERY tight to have a random lens file work so well in a totally different lens.

I appreciate all the help guys. Cheers

Na Horuk · 11-30-2014, 05:03 AM

One other thing is that maybe the lens is busted in some way other than just SDM. Maybe it has other faults, as well. But I am glad you improved your situation

Giklab · 11-30-2014, 05:18 AM

Nice that you got the lens sorted. Good luck in the future

**Kerrowdown** · 11-30-2014, 05:45 AM

Originally posted by wibbly

but I messed it up by loading the wrong lenseep file

I knew there must have been a reason why I stayed with manual lenses... but could nae think what it was.

wibbly · 01-09-2015, 04:16 PM

sorry to bump this again, but having used my 16-50 more than just for testing, it's still having focus issues.

if you are reading this and have your original lenseep file can you please email it to me?

wibbly(at)shaw.ca

thanks so much guys

**clackers** · 01-12-2015, 12:55 AM

If you receive one, you better hope that a unique lens ID is not expected as part of that file. You may need to do a side-by-side comparison in a text editor.

sTi · 01-12-2015, 01:45 AM

Originally posted by wibbly

sorry to bump this again, but having used my 16-50 more than just for testing, it's still having focus issues.

if you are reading this and have your original lenseep file can you please email it to me?

The LensROM also contains focus calibration info; e.g. when you send in the 16-50 to get it calibrated, the new focus correction values are stored there.
You are in effect trying to use the focus calibration values of a different lens in your own copy. You may be able to find one that reasonably matches yours (you have to check at all focal lengths and distances to make sure), but then again you may not...
If it does not work out this way, I think Pentax service will be able to fix it.

wibbly · 01-12-2015, 07:17 AM

Yep, I'm well aware. I am just trying to exhaust all options before sending it in or just tossing it. I suspect Pentax service wouldn't fix it without replacing the SDM as well, so there is likely little point. Maybe I'll get lucky or maybe not. I guess well see

RustyToyotaVT · 10-13-2015, 04:31 PM

The IT nerd in me got the best of me. As a test I backed up my lensROM and flashed a random copy from the database. I can't tell any difference in focus calibration at 16, 35, or 50mm regardless of the F-stop still requires the exact same +9/+10. The behavior seems identical. I may switch it back or just leave it this way for now, as it doesn't seem to make a bit of difference. I'd love to talk to a Pentax tech about how these things are calibrated at the factory service centers, how the programming is performed, etc.

I live close to Precision, I should figure out what bar those guys go to after work

bxf · 10-13-2015, 09:19 PM

Does anyone have the EEPROM file for the FA 43 Limited? Mine (bought second hand) needs a +10 AF adjustment, and I don't know if a larger value would be better still. I wonder if another version of the EEPROM would be better.

Thanks.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Do I need a DA 16-45 F4 for an upcoming holiday?	p38arover	Pentax SLR Lens Discussion	44	10-28-2014 03:25 PM
Machinery A Few From the Car Show B: Those Kids Think I'm An Idiot	sherrvonne	Post Your Photos!	2	05-06-2014 10:41 AM
Would you keep both an FA 50/1.4 and an M 50/1.7?	ChooseAName	Pentax SLR Lens Discussion	16	10-05-2012 03:52 AM
DA* 55mm f/1.4 - I'm an idiot, but oh well...	DRabbit	Pentax SLR Lens Discussion	18	05-12-2011 04:29 PM
I feel like an idiot!	stormdore	Photographic Technique	31	06-15-2008 06:53 PM

11-30-2014, 01:40 AM	#16
Sandy Hancock Moderator Site Supporter Join Date: Feb 2012 Location: Adelaide Hills, South Australia Photos: Gallery \| Albums Posts: 11,275	All's well that ends well. Back. Up.

11-30-2014, 02:19 AM	#17
wibbly Veteran Member Join Date: Nov 2014 Location: Edmonton Posts: 600 Original Poster	Ha! Yeah you've got that right. I really just misinterpreted the role of the eeprom data. I thought it was a list of instructions that the body would present and the lens would recognize. Ie the body would suggest to the lens that it was in focus, not vice versa. But yes, lesson learned. The tolerances must be VERY tight to have a random lens file work so well in a totally different lens. I appreciate all the help guys. Cheers

11-30-2014, 05:03 AM	#18
Na Horuk Veteran Member Join Date: Feb 2012 Location: Slovenia, probably Photos: Gallery \| Albums Posts: 11,186	One other thing is that maybe the lens is busted in some way other than just SDM. Maybe it has other faults, as well. But I am glad you improved your situation

11-30-2014, 05:18 AM	#19
Giklab Veteran Member Join Date: Jan 2012 Location: Slovenia Photos: Gallery Posts: 2,182	Nice that you got the lens sorted. Good luck in the future

11-30-2014, 05:45 AM	#20
Kerrowdown PEG Moderator Join Date: Aug 2008 Location: Highlands of Scotland... "Hold Infinity in the palm of your hand" - William Blake Photos: Gallery Posts: 57,833	Originally posted by wibbly but I messed it up by loading the wrong lenseep file I knew there must have been a reason why I stayed with manual lenses... but could nae think what it was.

01-09-2015, 04:16 PM	#21
wibbly Veteran Member Join Date: Nov 2014 Location: Edmonton Posts: 600 Original Poster	sorry to bump this again, but having used my 16-50 more than just for testing, it's still having focus issues. if you are reading this and have your original lenseep file can you please email it to me? wibbly(at)shaw.ca thanks so much guys

01-12-2015, 12:55 AM	#22
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	If you receive one, you better hope that a unique lens ID is not expected as part of that file. You may need to do a side-by-side comparison in a text editor.

01-12-2015, 01:45 AM	#23
sTi Forum Member Join Date: Feb 2011 Posts: 98	Originally posted by wibbly sorry to bump this again, but having used my 16-50 more than just for testing, it's still having focus issues. if you are reading this and have your original lenseep file can you please email it to me? The LensROM also contains focus calibration info; e.g. when you send in the 16-50 to get it calibrated, the new focus correction values are stored there. You are in effect trying to use the focus calibration values of a different lens in your own copy. You may be able to find one that reasonably matches yours (you have to check at all focal lengths and distances to make sure), but then again you may not... If it does not work out this way, I think Pentax service will be able to fix it.

01-12-2015, 07:17 AM	#24
wibbly Veteran Member Join Date: Nov 2014 Location: Edmonton Posts: 600 Original Poster	Yep, I'm well aware. I am just trying to exhaust all options before sending it in or just tossing it. I suspect Pentax service wouldn't fix it without replacing the SDM as well, so there is likely little point. Maybe I'll get lucky or maybe not. I guess well see

10-13-2015, 04:31 PM	#25
RustyToyotaVT Senior Member Join Date: Feb 2011 Location: UK Posts: 103	The IT nerd in me got the best of me. As a test I backed up my lensROM and flashed a random copy from the database. I can't tell any difference in focus calibration at 16, 35, or 50mm regardless of the F-stop still requires the exact same +9/+10. The behavior seems identical. I may switch it back or just leave it this way for now, as it doesn't seem to make a bit of difference. I'd love to talk to a Pentax tech about how these things are calibrated at the factory service centers, how the programming is performed, etc. I live close to Precision, I should figure out what bar those guys go to after work

10-13-2015, 09:19 PM	#26
bxf Veteran Member Join Date: Jul 2010 Location: Lisbon area Posts: 1,660	Does anyone have the EEPROM file for the FA 43 Limited? Mine (bought second hand) needs a +10 AF adjustment, and I don't know if a larger value would be better still. I wonder if another version of the EEPROM would be better. Thanks.