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01-20-2011, 10:52 AM   #1
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sigma fine adjust (or not) advice please

Just calibrating lenses on replacement K-5. Two Sigma lenses 70mm macro and 15mm fisheye. (Both screw focus.)
The 70mm needs +4 and the 15 requires -2 adjustment to be spot-on.
The K-5 can't tell them apart. The Exif data just calls them 'sigma lens'. This seems to mean that these two sigma lenses will be forced to share the same fine adjustment setting - wrong for both or one of the lenses.
Certainly when I swap lenses there is no alteration in the fine adjust.
Can folks confirm that this is a known frustration that I have to live with or am I missing something?

Thanks,

Allan.

01-20-2011, 11:20 AM   #2
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Sigma has been know to reuse lens ID numbers for different models. From your description, it looks like this is the case for the 70mm macro and 15mm fisheye for Pentax.

Unfortunately, I don't think there is a solution to your problem. You'll have to pick one lens to adjust for.
01-20-2011, 02:31 PM   #3
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QuoteOriginally posted by RBellavance Quote
Sigma has been know to reuse lens ID numbers for different models. From your description, it looks like this is the case for the 70mm macro and 15mm fisheye for Pentax.

Unfortunately, I don't think there is a solution to your problem. You'll have to pick one lens to adjust for.
Not really. Simply make a mental note of the setting for each lens and dial it in when you put either of the lenses on the cam. A hassle but a minor one.
01-24-2011, 04:23 PM   #4
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Original Poster
Thanks for your comments.

Allan.

01-24-2011, 11:51 PM   #5
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Camera allows to make different adjustment for lenses with different LensID's.
You can check them here: Pentax Tags

Rows like this:
'8 255' = Sigma Lens (8 255)
'8 255.1' = Sigma 70-200mm F2.8 EX DG Macro HSM II
'8 255.2' = Sigma APO 150-500mm F5-6.3 DG OS HSM
'8 255.3' = Sigma 50-150mm F2.8 II APO EX DC HSM
indicate same lens id (8 255) for three lenses.
01-25-2011, 03:07 AM   #6
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I have two Sigma telephoto lenses, a 300/2,8 and a 500/4,5. They do require somewhat different AF adjustments.
These lenses are not on the list, but somehow both the K 7 and the K 5 can tell them apart.
01-25-2011, 05:10 AM   #7
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Nothing to add except that I have the same problem with a Sigma17-70 and Sigma10-20.
01-25-2011, 05:55 AM   #8
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QuoteOriginally posted by Gimbal Quote
Nothing to add except that I have the same problem with a Sigma17-70 and Sigma10-20.
Ouch! I have that pair, along with a new year's resolution to calibrate on my new K-5.

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